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1
00:00:07,201 --> 00:00:10,412
Narrator: A PANORAMA OF LIFE
AND A LANDSCAPE LIKE NO OTHER.
2
00:00:10,458 --> 00:00:14,545
A PLACE WHERE ANCIENT CONFLICTS
PLAY OUT IN A FRAGILE BALANCE.
3
00:00:14,576 --> 00:00:17,601
BUT SOMETHING HAS TILTED
THAT BALANCE DANGEROUSLY,
4
00:00:17,601 --> 00:00:20,264
AND THE PARK'S MAGNIFICENT ELK
ARE DISAPPEARING.
5
00:00:20,264 --> 00:00:22,056
BUT WHO IS THE CULPRIT?
6
00:00:22,328 --> 00:00:25,049
THE WOLF,
REINTRODUCED 20 YEARS AGO,
7
00:00:25,049 --> 00:00:26,523
RIGHT WHEN
THE ELK NUMBERS CRASHED?
8
00:00:27,544 --> 00:00:30,133
GRIZZLIES,
WHO HAVE ALWAYS PREYED
9
00:00:30,140 --> 00:00:32,341
ON THE YOUNGEST
AND MOST VULNERABLE ELK?
10
00:00:32,342 --> 00:00:34,172
[THUNDER]
11
00:00:34,194 --> 00:00:36,647
OR IS IT SOMETHING
MORE INSIDIOUS AND BAFFLING?
12
00:00:36,647 --> 00:00:38,383
[BANG]
13
00:00:39,108 --> 00:00:42,144
NOW SCIENTISTS ARE RACING
TO SOLVE THE MYSTERY
14
00:00:42,144 --> 00:00:43,871
OF THE DISAPPEARING ELK IN...
15
00:00:44,596 --> 00:00:46,494
MYSTERY IN YELLOWSTONE.
16
00:00:46,908 --> 00:00:48,634
♪
17
00:00:53,398 --> 00:00:54,916
[HELICOPTER]
18
00:00:56,608 --> 00:00:59,369
♪
19
00:01:09,835 --> 00:01:12,592
THE SEARCH FOR SUSPECTS
IN THIS MYSTERY
20
00:01:12,592 --> 00:01:14,555
BEGINS WITH THE
VICTIMS THEMSELVES.
21
00:01:19,616 --> 00:01:23,498
ONLY TWO DECADES AGO, THE PARK
WAS THICK WITH THESE ELK...
22
00:01:23,498 --> 00:01:25,553
NEARLY 20,000 OF THEM.
23
00:01:25,881 --> 00:01:28,847
NOW LESS THAN A QUARTER
OF THEM REMAIN.
24
00:01:32,538 --> 00:01:33,944
[BANG]
25
00:01:42,805 --> 00:01:46,528
WILDLIFE BIOLOGISTS NEED TO
MONITOR THE HERD'S EVERY MOVE
26
00:01:46,528 --> 00:01:48,108
AND THE HEALTH OF ITS MEMBERS...
27
00:01:48,149 --> 00:01:49,899
AND A ROUND-UP BY HELICOPTER
28
00:01:49,899 --> 00:01:52,972
IS THE QUICKEST WAY TO CAPTURE
CRITICAL INFORMANTS.
29
00:01:56,150 --> 00:01:58,915
IT LOOKS BRUTAL,
BUT THE SCIENTISTS HAVE LEARNED
30
00:01:58,915 --> 00:02:00,942
THAT THIS IS ONE
OF THE LEAST TRAUMATIC WAYS
31
00:02:00,978 --> 00:02:03,198
TO RECRUIT VOLUNTEERS
FOR THEIR MISSION.
32
00:02:06,555 --> 00:02:09,226
THEY MOVE QUICKLY
TO RESTRAIN THE ANIMALS
33
00:02:09,226 --> 00:02:11,026
AND GET THE SAMPLES THEY NEED.
34
00:02:13,568 --> 00:02:16,928
BIOLOGIST ARTHUR MIDDLETON
HAS SPENT THE LAST FEW YEARS
35
00:02:16,964 --> 00:02:19,896
WRESTLING WITH THE STRANGE
AND UNNERVING ELK DECLINE.
36
00:02:19,932 --> 00:02:22,357
Arthur Middleton:
THE QUESTIONS WERE PRESSING,
37
00:02:22,357 --> 00:02:24,331
THE PROJECT WAS ALREADY
READY TO GO,
38
00:02:24,331 --> 00:02:28,018
AND SO I CAME ACROSS THE STATE
FROM THE UNIVERSITY
39
00:02:28,018 --> 00:02:30,397
UP TO NORTHWEST WYOMING
40
00:02:30,397 --> 00:02:32,356
AND I STARTED MY FIELD WORK.
41
00:02:33,739 --> 00:02:36,956
Narrator: AFTER MAKING SURE THE
ELK COW IS SAFELY RESTRAINED,
42
00:02:36,984 --> 00:02:39,489
HE TAKES BLOOD SAMPLES
THAT WILL BE CHECKED FOR SIGNS
43
00:02:39,489 --> 00:02:43,487
OF DISEASE, STARVATION, STRESS,
AND PREGNANCY.
44
00:02:45,686 --> 00:02:48,559
THEN HE FITS THE COW
WITH A GPS COLLAR
45
00:02:48,678 --> 00:02:52,163
THAT WILL TRANSMIT HER POSITION
EVERY THREE TO FIVE HOURS.
46
00:02:57,376 --> 00:03:00,647
THE TEAM AIMS TO GET EVERY
ANIMAL CAPTURED AND RELEASED
47
00:03:00,647 --> 00:03:03,669
IN LESS THAN 8 MINUTES
AND WITHOUT ANY SEDATION.
48
00:03:08,815 --> 00:03:12,271
AND THEN THE NEWLY RECRUITED
INFORMANT IS FREE AGAIN...
49
00:03:12,271 --> 00:03:15,124
UNAWARE JUST HOW MUCH
VITAL INFORMATION
50
00:03:15,125 --> 00:03:17,322
SHE'LL BE GIVING MIDDLETON
AND HIS TEAM...
51
00:03:17,322 --> 00:03:20,300
AND THAT SHE COULD HELP EXPOSE
THE KILLER OF HER KIND.
52
00:03:21,097 --> 00:03:22,440
[BUGLING]
53
00:03:24,838 --> 00:03:26,573
THERE ARE MANY
POTENTIAL CULPRITS
54
00:03:26,573 --> 00:03:28,188
IN THE DECLINE OF THE HERD,
55
00:03:28,188 --> 00:03:31,076
BUT THE FIRST ONE
ON EVERYONE'S MIND IS THE WOLF.
56
00:03:31,076 --> 00:03:33,252
LONG MISSING FROM YELLOWSTONE,
57
00:03:33,252 --> 00:03:35,346
THE WOLF ARRIVED
BACK ON THE SCENE
58
00:03:35,346 --> 00:03:37,510
RIGHT WHEN THE ELK NUMBERS
BEGAN TO CRASH.
59
00:03:39,510 --> 00:03:42,569
TOO MUCH OF A COINCIDENCE,
IN THE MINDS OF MANY.
60
00:03:42,569 --> 00:03:44,648
BUT PINNING THE CRIME
ON THE RETURN OF THE WOLF
61
00:03:44,810 --> 00:03:46,467
REQUIRES PROOF.
62
00:03:50,569 --> 00:03:53,608
WOLVES, ONCE CONSIDERED
DANGEROUS VERMIN,
63
00:03:53,608 --> 00:03:55,647
WERE SYSTEMATICALLY EXTERMINATED
64
00:03:55,647 --> 00:03:58,738
FROM THE TIME THE PARK
WAS FOUNDED IN 1872.
65
00:04:00,101 --> 00:04:02,666
BY THE 1920s, THEY WERE GONE,
66
00:04:02,812 --> 00:04:06,330
AND THE PARK WAS TURNED INTO
A SAFER PLAYGROUND FOR TOURISTS.
67
00:04:07,661 --> 00:04:11,242
Film narrator: YOU'VE JUST ENTERED
YELLOWSTONE NATIONAL PARK.
68
00:04:11,320 --> 00:04:14,068
YOU'RE A MILE AND A HALF
ABOVE SEA LEVEL,
69
00:04:14,068 --> 00:04:16,604
AND THE AIR IS CLEAR
AND INVIGORATING.
70
00:04:16,604 --> 00:04:20,084
ALL AROUND US IS THE EVIDENCE
OF THE PARK'S VOLCANIC ORIGIN.
71
00:04:20,084 --> 00:04:25,015
ALL THE FLOWERS AND FORESTS AND
MOUNTAINS ARE RESERVED FOR YOU.
72
00:04:25,015 --> 00:04:26,507
♪
73
00:04:36,613 --> 00:04:40,371
Narrator: THE YELLOWSTONE NATIONAL
PARK STRADDLES THE CONTINENTAL DIVIDE
74
00:04:40,371 --> 00:04:42,951
OF THE NORTHERN ROCKY MOUNTAINS
IN WYOMING.
75
00:04:44,357 --> 00:04:47,834
IT'S THE HEART OF THE GREATER
YELLOWSTONE ECOSYSTEM...
76
00:04:47,873 --> 00:04:51,364
AN AREA OF ALMOST
30,000 SQUARE MILES.
77
00:04:51,670 --> 00:04:53,638
[ELK BUGLING]
78
00:04:54,389 --> 00:04:55,929
IT LOOKED PRISTINE...
79
00:04:55,929 --> 00:04:57,179
BUT WITHOUT THE WOLF,
80
00:04:57,179 --> 00:05:00,057
YELLOWSTONE WAS AN ECOSYSTEM
OUT OF BALANCE.
81
00:05:00,058 --> 00:05:03,749
THE ELK POPULATION EXPLODED
TO UNSUSTAINABLE LEVELS.
82
00:05:06,762 --> 00:05:11,450
BUT IN 1995, 70 YEARS AFTER
THE LAST WOLF HAD BEEN KILLED,
83
00:05:11,497 --> 00:05:13,464
THE PARK DID SOMETHING RADICAL:
84
00:05:13,464 --> 00:05:16,349
THEY IMPORTED A PACK OF WOLVES
FROM CANADA
85
00:05:16,350 --> 00:05:18,885
AND RELEASED THEM
INTO YELLOWSTONE.
86
00:05:19,921 --> 00:05:23,799
Middleton: THE WOLF HAD BEEN
REINTRODUCED IN THE MID 1990s,
87
00:05:23,799 --> 00:05:27,455
AND IT WAS A HUGE
SUCCESS BIOLOGICALLY.
88
00:05:27,846 --> 00:05:31,192
THEIR POPULATION NUMBERS
GREW VERY RAPIDLY,
89
00:05:31,192 --> 00:05:34,269
AND THEY EXPANDED FAR
OUTSIDE OF YELLOWSTONE PARK
90
00:05:34,269 --> 00:05:35,936
INTO THE SURROUNDING REGION.
91
00:05:36,502 --> 00:05:38,733
Narrator: THE WOLVES
IMMEDIATELY SET ABOUT DOING
92
00:05:38,752 --> 00:05:40,640
WHAT THE PARK BIOLOGISTS
HAD HOPED...
93
00:05:40,814 --> 00:05:43,668
HUNTING THE OVERPOPULATED ELK
WITH A VENGEANCE,
94
00:05:43,668 --> 00:05:45,800
BRINGING DOWN ELK NUMBERS
95
00:05:45,886 --> 00:05:48,493
BUT ACTUALLY IMPROVING
THE HEALTH OF THE HERDS.
96
00:05:48,493 --> 00:05:50,833
♪
97
00:05:53,249 --> 00:05:56,493
[ELK BUGLING]
98
00:05:56,494 --> 00:05:58,461
♪
99
00:06:01,372 --> 00:06:03,363
BUT NOT EVERYONE WAS THRILLED.
100
00:06:03,700 --> 00:06:06,246
HUNTERS WHO COMPETE
WITH WOLVES FOR ELK
101
00:06:06,246 --> 00:06:08,677
AND RANCHERS WHO FEARED
FOR THEIR LIVESTOCK
102
00:06:08,708 --> 00:06:11,514
PREDICTED THE WOLVES
WOULD CAUSE A CATASTROPHE.
103
00:06:11,514 --> 00:06:13,649
♪
104
00:06:17,389 --> 00:06:19,069
20 YEARS LATER,
105
00:06:19,069 --> 00:06:21,932
IT WAS BEGINNING TO LOOK
LIKE THE WOLF-HATERS WERE RIGHT.
106
00:06:21,933 --> 00:06:24,342
ELK NUMBERS
HAD PLUMMETED BY 80%.
107
00:06:24,342 --> 00:06:27,144
AND AS A FEW DOZEN WOLVES
BECAME HUNDREDS,
108
00:06:27,145 --> 00:06:29,672
PRESSURE GREW TO SHUT DOWN
THE RETURN OF THE WOLF.
109
00:06:29,672 --> 00:06:32,200
Middleton: THE TIME DREW
CLOSER AND CLOSER
110
00:06:32,200 --> 00:06:34,306
FOR THEIR PROTECTIONS
TO BE LIFTED,
111
00:06:34,306 --> 00:06:36,439
AND THAT MEANS
THEIR MANAGEMENT SHIFTS
112
00:06:36,439 --> 00:06:41,844
FROM A PROTECTION POSTURE
TO MORE OF A HARVEST POSTURE,
113
00:06:41,844 --> 00:06:44,953
WHERE THE PUBLIC IS PERMITTED
TO HUNT WOLVES.
114
00:06:44,953 --> 00:06:46,889
Narrator:
THE SITUATION WAS URGENT:
115
00:06:47,258 --> 00:06:49,068
IF WOLVES COULD BE HUNTED AGAIN,
116
00:06:49,068 --> 00:06:51,258
THE WHOLE SUCCESS
OF THE PARK'S ATTEMPT
117
00:06:51,258 --> 00:06:53,775
TO RETURN YELLOWSTONE
TO ITS ORIGINAL BALANCE
118
00:06:53,775 --> 00:06:55,207
WAS IN DANGER.
119
00:06:55,932 --> 00:06:58,314
ENTER DR. MIDDLETON,
120
00:06:58,383 --> 00:07:00,515
A YOUNG BIOLOGIST
SENT TO DETERMINE
121
00:07:00,515 --> 00:07:03,170
WHETHER THE WOLF WAS NOT
JUST A SUPREME PREDATOR
122
00:07:03,170 --> 00:07:04,907
BUT A MASS MURDERER.
123
00:07:06,253 --> 00:07:09,024
Middleton: I CAME HERE TO FIND
THE ANSWER TO A QUESTION
124
00:07:09,024 --> 00:07:11,766
THAT A LOT OF PEOPLE LOCALLY
AND A LOT OF SCIENTISTS
125
00:07:11,766 --> 00:07:13,086
HAD ASKED, WHICH IS:
126
00:07:13,086 --> 00:07:16,563
DOES THE PRESENCE OF WOLVES
SCARE ELK SO MUCH
127
00:07:16,563 --> 00:07:19,680
THAT THEY'RE LOSING FAT,
THEY'RE STRESSED OUT,
128
00:07:19,680 --> 00:07:21,371
AND THEY'RE NOT REPRODUCING?
129
00:07:21,371 --> 00:07:25,602
SO I HAD TO GO OUT IN THE FIELD
AND STARE AT ELK.
130
00:07:27,738 --> 00:07:30,894
Narrator: MONITORING THE HERD
THROUGH THE BRUTAL WINTERS
131
00:07:30,894 --> 00:07:33,424
IN THEIR TERRITORY
IN THE LOWER NORTHERN RANGES
132
00:07:33,453 --> 00:07:35,890
ISN'T EXACTLY ALL
IT'S CRACKED UP TO BE.
133
00:07:37,574 --> 00:07:41,016
Middleton: CONTRARY TO WHAT
I WAS LED TO BELIEVE,
134
00:07:41,016 --> 00:07:43,791
ELK DON'T REALLY DO VERY MUCH.
135
00:07:43,791 --> 00:07:46,787
THEY'RE CERTAINLY NOT RUNNING
INTO WOLVES ALL THAT MUCH,
136
00:07:46,811 --> 00:07:49,986
AND THEY'RE MOSTLY JUST DIGGING
AROUND IN THE SNOW FEEDING
137
00:07:49,986 --> 00:07:51,540
ALL DAY.
138
00:07:51,869 --> 00:07:54,265
Narrator: THE ELK CERTAINLY
DON'T LOOK STRESSED,
139
00:07:54,266 --> 00:07:55,932
AND THEY BARELY GLANCE UP
140
00:07:55,932 --> 00:07:59,120
AT ANY WOLF THAT ISN'T
WITHIN SPRINTING DISTANCE.
141
00:08:01,546 --> 00:08:03,562
THE RESULT OF THE BLOOD TESTS
142
00:08:03,562 --> 00:08:06,001
CONFIRM WHAT MIDDLETON
IS SEEING IN THE FIELD:
143
00:08:06,002 --> 00:08:08,226
THE COW ELK ARE
IN EXCELLENT HEALTH,
144
00:08:08,226 --> 00:08:11,281
AND OVER 70% OF THE FEMALES
ARE PREGNANT.
145
00:08:11,318 --> 00:08:14,664
STRESS CAN PREVENT PREGNANCY
AND CAUSE MISCARRIAGE,
146
00:08:14,664 --> 00:08:17,075
SO THAT DOESN'T SEEM
TO BE THE PROBLEM.
147
00:08:19,815 --> 00:08:22,252
BUT ANOTHER RESULT
IS DISTURBING:
148
00:08:22,307 --> 00:08:24,836
THE TESTED FEMALES
ARE OLDER THAN EXPECTED.
149
00:08:24,952 --> 00:08:27,369
ONLY A HANDFUL
IS UNDER 9 YEARS OLD,
150
00:08:27,369 --> 00:08:29,195
FAR PAST AN ELK'S PRIME.
151
00:08:29,195 --> 00:08:31,686
THEY GENERALLY DON'T LIVE
PAST 15.
152
00:08:32,466 --> 00:08:34,959
[BUGLING]
153
00:08:34,959 --> 00:08:38,680
THE HERD ISN'T JUST SHRINKING;
IT'S BECOMING GERIATRIC.
154
00:08:39,467 --> 00:08:42,865
IN WINTER, THE ELK HERD
SEEMS HEALTHY AND RELAXED...
155
00:08:42,865 --> 00:08:43,889
JUST OLD.
156
00:08:43,889 --> 00:08:45,889
SOMETHING MUST BE
HAPPENING TO THEM
157
00:08:45,889 --> 00:08:49,255
AT SOME OTHER TIME OF THE YEAR,
KILLING OFF THE YOUNG ELK.
158
00:08:51,858 --> 00:08:53,451
SPRING IS COMING,
159
00:08:53,553 --> 00:08:55,844
MEANING THE MASS MIGRATION
OF PREY ANIMALS
160
00:08:55,845 --> 00:08:57,398
IN SEARCH OF BETTER GRAZING.
161
00:08:57,920 --> 00:08:59,905
MANY OF MIDDLETON'S COLLARED ELK
162
00:08:59,905 --> 00:09:02,402
ARE HEADED TO THE HIGH PLAINS
IN THE INTERIOR OF THE PARK,
163
00:09:02,403 --> 00:09:04,722
WHERE THERE WILL BE
RICH PASTURE,
164
00:09:04,722 --> 00:09:06,855
JUST IN TIME FOR CALVING.
165
00:09:06,856 --> 00:09:08,209
COULD SOMETHING BE HAPPENING
166
00:09:08,209 --> 00:09:10,621
DURING THE LONG
AND ARDUOUS TREK?
167
00:09:13,967 --> 00:09:16,091
Middleton: ONE OF THE MOST
IMPORTANT THINGS
168
00:09:16,091 --> 00:09:17,983
THAT HAPPENS THIS TIME OF YEAR
169
00:09:17,983 --> 00:09:21,113
IS THE MIGRATION
OF THE LARGE HERBIVORES...
170
00:09:21,113 --> 00:09:24,434
THE ELK, THE MOOSE,
THE PRONGHORN ANTELOPE,
171
00:09:24,434 --> 00:09:26,992
THE MULE DEER,
THE BIGHORN SHEEP.
172
00:09:27,083 --> 00:09:30,304
ALL THOSE ANIMALS,
THOUSANDS AND THOUSANDS,
173
00:09:30,500 --> 00:09:34,910
TENS OF THOUSANDS OF ANIMALS ARE
MOVING TO THEIR SUMMER HABITAT,
174
00:09:34,910 --> 00:09:37,653
NEARER TO THE CORE
OF YELLOWSTONE,
175
00:09:37,715 --> 00:09:41,016
AND ELK ARE THE DOMINANT
MIGRATORY ANIMAL.
176
00:09:41,016 --> 00:09:43,788
Narrator:
AS THE ELK SLOWLY MIGRATE
177
00:09:43,788 --> 00:09:46,195
BACK UP INTO
THE YELLOWSTONE NATIONAL PARK,
178
00:09:46,195 --> 00:09:48,558
THEY PASS THROUGH DIFFERENT
WOLF TERRITORIES...
179
00:09:48,726 --> 00:09:50,853
WITH MIDDLETON ON THEIR HEELS.
180
00:09:50,853 --> 00:09:52,979
BUT ONCE AGAIN, HE FINDS OUT
181
00:09:52,979 --> 00:09:55,110
THAT ENCOUNTERS
BETWEEN ELK AND WOLVES
182
00:09:55,111 --> 00:09:56,767
REMAIN EXTREMELY RARE,
183
00:09:56,767 --> 00:09:58,784
AND THE ELK SHOW
NO SIGN OF STRESS.
184
00:10:02,634 --> 00:10:06,170
BY MAY, THEY REACH THE HIGH
PLATEAU IN THE INTERIOR,
185
00:10:06,170 --> 00:10:09,027
WHERE NEW, RICH GRASSES
AND MILD TEMPERATURES
186
00:10:09,027 --> 00:10:10,829
SET THE STAGE
FOR A NEW SEASON...
187
00:10:11,058 --> 00:10:12,750
AND A NEW DRAMA.
188
00:10:13,613 --> 00:10:16,074
[WOLF HOWLING]
189
00:10:16,074 --> 00:10:19,410
AS NIGHT FALLS, THE FEMALES
SLIP AWAY FROM THE HERD
190
00:10:19,411 --> 00:10:22,706
AND PREPARE TO WELCOME A SLEW
OF NEWCOMERS INTO THE WORLD
191
00:10:22,706 --> 00:10:25,863
AND A WHOLE NEW SET
OF VULNERABILITIES.
192
00:10:25,863 --> 00:10:27,765
[HOWLING]
193
00:10:29,526 --> 00:10:33,467
THE NIGHT IS CALM,
BUT THE DAWN WILL BRING TROUBLE.
194
00:10:33,467 --> 00:10:35,565
♪
195
00:10:42,649 --> 00:10:45,443
DAYBREAK REVEALS
THE YEARLY MIRACLE...
196
00:10:45,633 --> 00:10:50,016
OVERNIGHT, YELLOWSTONE COUNTRY
HAS BECOME A MASSIVE NURSERY.
197
00:10:50,016 --> 00:10:51,581
[GEESE HONKING]
198
00:10:54,895 --> 00:10:57,691
♪
199
00:11:10,717 --> 00:11:13,165
THE CALVES CAN STAND
WITHIN HOURS,
200
00:11:13,165 --> 00:11:16,299
BUT THEY WON'T BE ABLE TO RUN
WITH THE HERD FOR TWO WEEKS.
201
00:11:16,330 --> 00:11:20,567
SO THEIR MOTHERS KEEP THEM APART
AND KEEP A CLOSE EYE ON THEM.
202
00:11:20,567 --> 00:11:22,992
♪
203
00:11:33,844 --> 00:11:37,965
THE SHEER NUMBER OF ELK CALVES,
ALMOST ALL IN GOOD HEALTH,
204
00:11:37,965 --> 00:11:40,293
CLEARLY SHOWS
THAT THE ELK PREGNANCIES
205
00:11:40,293 --> 00:11:42,827
HAVE NOT BEEN AFFECTED
BY THE PRESENCE OF WOLVES.
206
00:11:47,741 --> 00:11:50,640
BUT THE PREDATORS SENSE
A NEW OPPORTUNITY...
207
00:11:50,779 --> 00:11:53,407
THERE ARE YOUNG
PREY ANIMALS EVERYWHERE.
208
00:12:02,111 --> 00:12:04,282
WOLVES ARE DEVOTED PARENTS;
209
00:12:04,337 --> 00:12:07,396
THE WHOLE PACK WILL DO
WHAT IT CAN TO FEED THEIR PUPS.
210
00:12:09,979 --> 00:12:12,998
BEAR FAMILIES HAVE EMERGED
FROM HIBERNATION,
211
00:12:12,998 --> 00:12:15,333
AND THE MOTHERS
HAVEN'T EATEN IN MONTHS.
212
00:12:17,586 --> 00:12:20,402
EVEN SCAVENGERS
WILL TURN INTO HUNTERS
213
00:12:20,430 --> 00:12:22,907
WHEN SPRING CALVES
ARE EVERYWHERE FOR THE PICKING.
214
00:12:25,240 --> 00:12:28,224
BUT THE HUNTERS NEED TO CHOOSE
THE HUNTED CAREFULLY.
215
00:12:28,333 --> 00:12:31,470
BISON CALVES WOULD SEEM RIPE
FOR THE PICKING,
216
00:12:31,612 --> 00:12:33,255
BUT THEY'VE ALREADY
JOINED THE HERD
217
00:12:33,255 --> 00:12:35,133
AND ARE PROTECTED BY GIANTS.
218
00:12:43,667 --> 00:12:45,661
ELK CALVES ARE SMALLER
219
00:12:45,715 --> 00:12:48,488
AND STILL DON'T HAVE
THE PROTECTION OF THE HERD.
220
00:12:55,731 --> 00:12:58,328
ELK MOTHERS, TOO,
ARE EXTREMELY PROTECTIVE...
221
00:12:58,329 --> 00:13:01,262
BUT YOUNG MOTHERS
CAN MAKE MISTAKES.
222
00:13:01,263 --> 00:13:03,411
MOM KNOWS THAT WATER
MEANS SAFETY
223
00:13:03,411 --> 00:13:05,435
FROM ALMOST ALL PREDATORS...
224
00:13:05,435 --> 00:13:07,341
BUT THE LITTLE CALF ALSO KNOWS
225
00:13:07,341 --> 00:13:09,657
THAT HE'S NO MATCH
FOR RAGING MELTWATER.
226
00:13:13,701 --> 00:13:16,045
IT COULD BE A COSTLY MISTAKE.
227
00:13:16,224 --> 00:13:19,117
WOLVES ARE ON THE LOOKOUT
FOR UNPROTECTED YOUNGSTERS.
228
00:13:21,386 --> 00:13:22,871
[WOLF HOWLING]
229
00:13:24,912 --> 00:13:27,391
BUT MOTHER SOON REALIZES
HER MISTAKE;
230
00:13:27,392 --> 00:13:29,635
SHE HEADS BACK ACROSS THE RIVER.
231
00:13:29,636 --> 00:13:31,327
♪
232
00:13:43,559 --> 00:13:45,365
FORTUNATELY FOR HER,
233
00:13:45,365 --> 00:13:48,640
HER CALF HAS HIS OWN DEFENSE
THAT FOILS THE WOLF.
234
00:13:48,640 --> 00:13:50,346
♪
235
00:14:00,740 --> 00:14:05,428
HE, LIKE ALL NEWBORN ELK CALVES,
HAS ALMOST NO SCENT...
236
00:14:05,428 --> 00:14:08,795
AND EVEN THE KEEN-NOSED CANINE
CAN'T SMELL HIM.
237
00:14:08,795 --> 00:14:10,642
IT'S A BRILLIANT DEFENSE,
238
00:14:10,764 --> 00:14:12,925
ALLOWING THE MOTHER
TO WANDER AND GRAZE
239
00:14:12,925 --> 00:14:15,646
WHILE HER CAMOUFLAGED BABY
HUNKERS DOWN
240
00:14:15,647 --> 00:14:17,664
AND DISAPPEARS
INTO THE LANDSCAPE.
241
00:14:17,664 --> 00:14:21,494
AND MEANWHILE MOTHER ISN'T
GIVING AWAY WHERE HER BABY IS.
242
00:14:24,853 --> 00:14:27,399
IF WOLVES GET
TOO CLOSE FOR COMFORT,
243
00:14:27,399 --> 00:14:30,580
SHE'LL GET RIGHT IN THEIR FACES
TO LEAD THEM AWAY FROM HER CALF,
244
00:14:30,580 --> 00:14:32,407
KNOWING SHE'S FAST ENOUGH
245
00:14:32,407 --> 00:14:34,715
TO REACH THE SAVE HAVEN
OF WATER...
246
00:14:40,494 --> 00:14:42,917
AND GUTSY ENOUGH
TO KEEP THEM AT BAY.
247
00:14:45,064 --> 00:14:47,767
Middleton: ELK ARE
VERY SOPHISTICATED ANIMALS,
248
00:14:47,767 --> 00:14:51,697
SO EVEN WHEN WOLVES SHOW UP,
THEY CAN RUN AWAY,
249
00:14:51,697 --> 00:14:53,086
THEY CAN STAND THEIR GROUND,
250
00:14:53,086 --> 00:14:56,072
THEY CAN ASSESS
HOW VULNERABLE AM I?
251
00:14:56,072 --> 00:14:58,741
HEY, I'M FIVE YEARS OLD;
I'M IN TOP SHAPE.
252
00:14:58,828 --> 00:15:01,802
MY LEGS ARE FINE;
MY HEALTH IS FINE.
253
00:15:01,802 --> 00:15:03,902
I DON'T HAVE ANYTHING
TO WORRY ABOUT.
254
00:15:03,903 --> 00:15:05,905
[BIRDS CHIRPING]
255
00:15:10,744 --> 00:15:12,509
Narrator: AS SUMMER APPROACHES,
256
00:15:12,509 --> 00:15:15,041
THE DECLINE OF THE ELK
IS STILL A MYSTERY.
257
00:15:15,041 --> 00:15:18,103
THE INVESTIGATORS ARE ABOUT
TO COUNT THE CALVES AGAIN.
258
00:15:19,771 --> 00:15:22,145
AND THE RESULT IS DISTURBING.
259
00:15:22,443 --> 00:15:25,284
Middleton: YOU COULD HAVE
AS MANY CALVES AS COWS
260
00:15:25,338 --> 00:15:27,488
BECAUSE EVERY COW
CAN HAVE ONE CALF,
261
00:15:27,488 --> 00:15:30,725
SO, IN LATE SUMMER,
ONLY A FEW MONTHS AFTER CALVING
262
00:15:30,725 --> 00:15:32,415
WE COUNT HOW MANY CALVES
THERE ARE,
263
00:15:32,436 --> 00:15:34,156
AND IF THERE'S VERY FEW CALVES,
264
00:15:34,156 --> 00:15:36,072
THEN SOMETHING
DURING THE SUMMER,
265
00:15:36,073 --> 00:15:38,006
UP ON THE SUMMER RANGE,
266
00:15:38,069 --> 00:15:40,042
IS CAUSING THE LOSS
OF THOSE CALVES.
267
00:15:40,707 --> 00:15:42,379
Narrator: BY SUMMER'S END,
268
00:15:42,379 --> 00:15:45,228
ONLY A THIRD OF THE CALVES
ARE STILL ALIVE.
269
00:15:45,228 --> 00:15:48,110
ARTHUR MIDDLETON
NEEDS TO REASSESS.
270
00:15:49,805 --> 00:15:52,445
THE ELK COWS WERE
IN GOOD PHYSICAL CONDITION
271
00:15:52,445 --> 00:15:53,539
IN THE WINTER,
272
00:15:53,539 --> 00:15:54,723
WITH MOST OF THEM PREGNANT
273
00:15:54,723 --> 00:15:57,558
AND SHOWING NO SIGNS
OF WOLF-INDUCED STRESS.
274
00:15:57,558 --> 00:16:01,198
THE HERD IS OLD, BUT THEY'RE
CARRYING THE CALVES TO TERM
275
00:16:01,198 --> 00:16:03,269
AND GIVING BIRTH
TO HEALTHY YOUNG.
276
00:16:06,709 --> 00:16:09,136
BUT THEN THEY START
TO DISAPPEAR,
277
00:16:09,459 --> 00:16:12,232
AND, EVEN THOUGH THE ELK NUMBERS
WENT INTO FREE FALL
278
00:16:12,281 --> 00:16:14,980
AT THE SAME TIME AS
THE REINTRODUCTION OF THE WOLF,
279
00:16:14,980 --> 00:16:17,309
THERE'S NO SMOKING GUN HERE...
280
00:16:17,309 --> 00:16:21,108
FOR THE SCIENTISTS REALIZED,
THROUGH MONITORING BOTH SPECIES,
281
00:16:21,108 --> 00:16:23,705
THE WOLVES AREN'T TAKING
NEARLY ENOUGH OF THEM
282
00:16:23,706 --> 00:16:25,339
TO ACCOUNT
FOR THE ELK'S DECLINE.
283
00:16:25,398 --> 00:16:26,920
[HOWLING]
284
00:16:26,920 --> 00:16:29,470
Middleton: WOLVES ARE ONLY
ONE OF FIVE PREDATORS...
285
00:16:29,471 --> 00:16:31,787
ACTUALLY SIX
IF YOU COUNT HUMANS...
286
00:16:31,787 --> 00:16:35,467
THAT EAT ELK, AND THEY WERE NOT
AFFECTING THESE ELK
287
00:16:35,467 --> 00:16:38,294
AS STRONGLY AS EVERYBODY
SAID THEY WERE.
288
00:16:38,294 --> 00:16:40,162
AND SO I SPENT A LOT OF TIME
289
00:16:40,162 --> 00:16:41,888
FINDING OUT
WHAT WAS NOT GOING ON;
290
00:16:41,888 --> 00:16:44,037
I NEEDED TO FIND OUT
WHAT WAS GOING ON.
291
00:16:44,037 --> 00:16:45,763
♪
292
00:16:51,517 --> 00:16:53,989
Narrator: SINCE HUNTING
WITHIN THE PARK BOUNDARIES
293
00:16:54,013 --> 00:16:54,791
IS PROHIBITED
294
00:16:54,791 --> 00:16:55,962
AND OTHER PREDATORS
295
00:16:55,962 --> 00:16:58,903
SUCH AS MOUNTAIN LIONS
AND WOLVERINES ARE RARE...
296
00:16:58,903 --> 00:17:00,502
♪
297
00:17:04,957 --> 00:17:07,246
BEARS ARE PRIME SUSPECTS.
298
00:17:07,246 --> 00:17:09,408
AND YELLOWSTONE IS HOME
TO TWO KINDS...
299
00:17:09,683 --> 00:17:11,570
BLACK AND GRIZZLY BEARS.
300
00:17:12,019 --> 00:17:15,554
IS EITHER OF THESE BEARS TO
BLAME FOR THE DISAPPEARING ELK?
301
00:17:15,554 --> 00:17:17,829
♪
302
00:17:20,949 --> 00:17:23,989
Middleton: WOLVES EAT SOME ELK,
OF COURSE THEY DO,
303
00:17:23,989 --> 00:17:28,645
BUT GRIZZLY BEARS ARE ESPECIALLY
GOOD AT FINDING NEWBORN CALVES.
304
00:17:28,645 --> 00:17:32,084
HUNTING AROUND LIKE BIRD DOGS
ON THE LANDSCAPE,
305
00:17:32,085 --> 00:17:36,313
FINDING THEIR SCENT,
CATCHING THEM AND EATING THEM,
306
00:17:36,313 --> 00:17:41,459
AND THEY DO IT IN THE FIRST FEW
WEEKS OF THE LIFE OF AN ELK CALF
307
00:17:41,459 --> 00:17:43,974
BEFORE IT'S EVEN UP,
RUNNING AROUND.
308
00:17:44,339 --> 00:17:49,334
AND THAT'S HOW MOST ELK CALVES
THAT DIE FROM PREDATION DIE.
309
00:17:52,584 --> 00:17:55,779
Narrator: THIS CALF,
KILLED EARLIER BY A GRIZZLY,
310
00:17:56,436 --> 00:17:58,802
IS STILL GUARDED BY ITS MOTHER.
311
00:18:05,262 --> 00:18:07,775
GRIZZLIES HAVE
THE KEENEST SENSE OF SMELL
312
00:18:07,879 --> 00:18:09,909
OF ALL YELLOWSTONE'S PREDATORS.
313
00:18:10,144 --> 00:18:12,764
THEY CAN DETECT
THE NEARLY SCENTLESS CALVES
314
00:18:12,764 --> 00:18:14,512
THAT OTHER PREDATORS CANNOT.
315
00:18:14,610 --> 00:18:16,233
[HOWLING]
316
00:18:18,680 --> 00:18:21,188
THE COW ELK TRIES
TO DISTRACT THE BEAR
317
00:18:21,188 --> 00:18:23,014
AWAY FROM HER DEAD YOUNGSTER.
318
00:18:23,014 --> 00:18:25,932
BUT SHE'S HELPLESS
BEFORE THE MASSIVE GRIZZLY.
319
00:18:25,932 --> 00:18:27,899
♪
320
00:18:32,732 --> 00:18:35,906
[RAVEN SQUAWKING]
321
00:18:35,907 --> 00:18:38,600
♪
322
00:18:47,471 --> 00:18:50,267
[RAVEN SQUAWKING]
323
00:18:50,888 --> 00:18:53,615
♪
324
00:18:56,957 --> 00:18:58,949
BUT IF THE BEAR IS RESPONSIBLE
325
00:18:58,949 --> 00:19:00,566
FOR THE ELK'S
PLUMMETING NUMBERS,
326
00:19:00,566 --> 00:19:03,175
THERE MUST BE SOMETHING ELSE
AT PLAY HERE.
327
00:19:03,176 --> 00:19:05,512
BEARS WERE AROUND
HUNTING ELK CALVES
328
00:19:05,512 --> 00:19:07,559
WHILE THE ELK HERDS
WERE STILL ENORMOUS,
329
00:19:07,560 --> 00:19:09,009
EVEN OUT OF CONTROL.
330
00:19:12,379 --> 00:19:14,808
[RAVEN SQUAWKING]
331
00:19:14,877 --> 00:19:17,700
IS SOMETHING TURNING
YELLOWSTONE'S GRIZZLY BEARS
332
00:19:17,700 --> 00:19:19,974
INTO ELK MASS MURDERERS?
333
00:19:24,771 --> 00:19:26,974
WITH ELK POPULATION DECIMATED
334
00:19:27,021 --> 00:19:29,512
AND THE GRIZZLIES NOW BECOMING
THE LEAD SUSPECT,
335
00:19:29,513 --> 00:19:32,356
IT'S TIME FOR SOME SERIOUS
BEAR EXPERTISE.
336
00:19:32,356 --> 00:19:34,862
FRANK VAN MANEN
AND HIS COLLEAGUES
337
00:19:34,862 --> 00:19:37,278
FROM THE INTERAGENCY
GRIZZLY BEAR STUDY TEAM
338
00:19:37,279 --> 00:19:39,280
KNOW THE BEARS
OF YELLOWSTONE COUNTRY
339
00:19:39,281 --> 00:19:41,144
BETTER THAN ANYONE ELSE.
340
00:19:41,145 --> 00:19:43,182
Man: HELLO!
341
00:19:43,593 --> 00:19:45,700
Frank van Manen: GRIZZLY BEARS
ARE THE ICONIC SPECIES
342
00:19:45,701 --> 00:19:47,358
IN THIS ECOSYSTEM.
343
00:19:47,630 --> 00:19:50,090
IT'S AN ANIMAL
THAT IS VERY POWERFUL.
344
00:19:50,090 --> 00:19:52,476
YOU KNOW WHEN YOU'RE WALKING
IN GRIZZLY BEAR COUNTRY
345
00:19:52,476 --> 00:19:54,502
THAT YOU'RE NOT
THE MOST POWERFUL CREATURE
346
00:19:54,503 --> 00:19:55,738
IN THAT LANDSCAPE,
347
00:19:55,738 --> 00:19:58,666
AND THAT'S A SENSE OF HUMILITY
THAT I ALMOST ENJOY.
348
00:19:58,666 --> 00:19:59,859
HEY, BEAR!
349
00:19:59,859 --> 00:20:03,204
AND IF WE CAN FIND A WAY TO
COEXIST WITH ANIMALS LIKE THAT,
350
00:20:03,204 --> 00:20:05,335
I THINK WE'VE
ACCOMPLISHED A LOT.
351
00:20:07,227 --> 00:20:10,699
Narrator: THE SCIENTISTS NEVER
ENTER GRIZZLY TERRITORY ALONE.
352
00:20:10,699 --> 00:20:12,673
IN TEAMS, THEY SET OUT
353
00:20:12,673 --> 00:20:15,040
TO CHECK ON THEIR
SPECIALLY DEVELOPED BEAR TRAPS...
354
00:20:15,041 --> 00:20:17,588
A LITTLE LOW-HANGING BARBED WIRE
355
00:20:17,588 --> 00:20:19,737
SURROUNDING A COCKTAIL
OF ANIMAL BLOOD.
356
00:20:22,417 --> 00:20:25,868
THE BARBS SNAG BITS OF BEAR FUR
FOR THEM TO ANALYZE,
357
00:20:25,868 --> 00:20:28,635
AND CAMERAS WILL CATCH THEM
IN THE ACT.
358
00:20:35,647 --> 00:20:38,500
THE CAMERA TRAP SHOWS
A FAMILY OF THREE
359
00:20:38,514 --> 00:20:40,928
PASSING THROUGH
JUST 24 HOURS AGO.
360
00:20:46,322 --> 00:20:49,382
AND SURE ENOUGH, THEY'VE LEFT
CRUCIAL HAIR SAMPLES
361
00:20:49,382 --> 00:20:51,268
FOR DNA ANALYSIS.
362
00:20:51,268 --> 00:20:54,585
THE RESEARCHERS HOPE TO IDENTIFY
EACH AND EVERY BEAR
363
00:20:54,585 --> 00:20:56,393
AND THEIR PREFERRED MENU.
364
00:20:59,991 --> 00:21:02,094
Van Manen: WE CAN GET A LOT
OF INFORMATION
365
00:21:02,116 --> 00:21:03,921
FROM THESE,
WHAT WE CALL HAIR TRAPS,
366
00:21:03,921 --> 00:21:06,436
BECAUSE WE'RE COLLECTING
DNA SAMPLES.
367
00:21:06,437 --> 00:21:09,101
THAT'S BASICALLY
LIKE GENETIC FINGERPRINTING.
368
00:21:09,101 --> 00:21:12,270
WE CAN IDENTIFY THE INDIVIDUAL,
369
00:21:12,271 --> 00:21:15,073
AND THERE'S SOME INCREDIBLY
INTRIGUING PATTERNS
370
00:21:15,073 --> 00:21:16,344
THAT COME OUT OF THAT.
371
00:21:17,483 --> 00:21:19,573
Narrator:
ONCE BEARS ARE IDENTIFIED,
372
00:21:19,573 --> 00:21:21,448
THE SCIENTISTS CAN BEGIN
TO FIGURE OUT
373
00:21:21,448 --> 00:21:23,729
WHERE THE BEARS ARE GOING
IN SEARCH OF FOOD...
374
00:21:23,730 --> 00:21:26,123
BOTH INSIDE
AND OUTSIDE THE PARK.
375
00:21:27,043 --> 00:21:29,408
ANALYSIS OF THE ANIMALS' SCAT
376
00:21:29,434 --> 00:21:32,083
TELLS THEM EXACTLY
WHAT THE BEARS ARE EATING.
377
00:21:37,787 --> 00:21:40,057
Van Manen:
GRIZZLY BEARS ARE DISTRIBUTED
378
00:21:40,076 --> 00:21:42,610
IN ABOUT 50,000
SQUARE KILOMETERS OF HABITAT,
379
00:21:42,611 --> 00:21:46,468
AND IT IS LISTED
AS A THREATENED POPULATION
380
00:21:46,468 --> 00:21:48,513
UNDER THE U.S.
ENDANGERED SPECIES ACT.
381
00:21:48,514 --> 00:21:51,136
SO OUR TASK AS A STUDY TEAM
382
00:21:51,137 --> 00:21:54,754
IS TO HELP SPECIES
AND POPULATIONS RECOVER.
383
00:21:55,223 --> 00:21:57,723
Narrator:
BUT HAIR TRAPS ARE NOT ENOUGH.
384
00:21:57,770 --> 00:22:00,218
TO REALLY FIGURE OUT
WHAT'S GOING ON,
385
00:22:00,218 --> 00:22:03,329
THEY NEED TO RECRUIT THE BEARS
THEMSELVES AS INFORMANTS.
386
00:22:03,938 --> 00:22:06,383
ONCE A BEAR IS TRAPPED
AND SEDATED,
387
00:22:06,383 --> 00:22:08,235
HE GETS A THOROUGH MEDICAL EXAM
388
00:22:08,235 --> 00:22:11,144
BEFORE BEING FITTED
WITH A GPS RADIO COLLAR.
389
00:22:13,887 --> 00:22:16,684
AN EXPERIENCED VET
FROM THE PARK MANAGEMENT
390
00:22:16,692 --> 00:22:19,340
HELPS WITH MEASURING,
WEIGHING AND BLOOD DRAWING.
391
00:22:22,085 --> 00:22:25,411
SO FAR, THE GPS DATA
HAS BEEN STARTLING.
392
00:22:25,411 --> 00:22:27,518
Van Manen:
WE HAVE SEEN MOVEMENTS
393
00:22:27,568 --> 00:22:29,831
DURING THE MIDDLE OF THE DAY,
BASED ON OUR GPS LOCATIONS,
394
00:22:29,832 --> 00:22:32,552
OF TEN KILOMETERS OR MORE,
395
00:22:32,552 --> 00:22:35,614
THROUGH A LOT OF AREAS WHERE
THERE WAS A LOT OF HUMAN USE
396
00:22:35,614 --> 00:22:37,734
AND NOBODY EVER
REPORTED SEEING HIM,
397
00:22:37,735 --> 00:22:39,867
NOBODY HAD ANY IDEA
398
00:22:39,867 --> 00:22:42,290
THIS ANIMAL WAS CROSSING
THIS LANDSCAPE
399
00:22:42,291 --> 00:22:44,982
AMONG ROADS AND PEOPLE,
BIKES AND CARS.
400
00:22:45,122 --> 00:22:48,903
IT'S REALLY FASCINATING HOW
THESE ANIMALS USE THE LANDSCAPE
401
00:22:48,903 --> 00:22:50,989
AND BASICALLY GO UNDETECTED.
402
00:22:51,024 --> 00:22:52,341
HEY-O!
403
00:22:52,341 --> 00:22:53,426
Narrator: THE COLLARS CONFIRM
404
00:22:53,426 --> 00:22:56,339
WHAT THE SCIENTISTS
HAVE ALWAYS SUSPECTED.
405
00:22:57,106 --> 00:23:00,645
BEARS ARE SMART ANIMALS
THAT ARE HAPPY TO MAKE USE
406
00:23:00,645 --> 00:23:02,230
OF HUMAN-CREATED SHORTCUTS.
407
00:23:03,071 --> 00:23:06,301
THEY USE THE SWATHS CREATED
FOR ELECTRICAL LINES
408
00:23:06,301 --> 00:23:08,032
AS URSINE HIGHWAYS,
409
00:23:08,032 --> 00:23:11,679
PERFECT FOR COVERING LONG
DISTANCES WITHOUT BEING SEEN.
410
00:23:11,679 --> 00:23:15,760
AND THEY USE THE TELEPHONE POLES
AS SCRATCHING POSTS,
411
00:23:15,760 --> 00:23:19,383
AS WELL AS LEAVING
CHEMICAL MESSAGES ON THEM
412
00:23:19,383 --> 00:23:20,640
FOR OTHER BEARS.
413
00:23:23,166 --> 00:23:24,609
THERE WE GO.
414
00:23:25,749 --> 00:23:27,096
[BEEP]
415
00:23:35,873 --> 00:23:38,654
Narrator: THE FINDINGS
ARE GREAT NEWS FOR BEARS.
416
00:23:45,258 --> 00:23:47,586
Van Manen: FROM ALL OUR
DEMOGRAPHIC ANALYSIS,
417
00:23:47,586 --> 00:23:49,500
WE'VE SEEN THAT THIS
POPULATION INCREASED
418
00:23:49,500 --> 00:23:53,075
BY BETWEEN
ABOUT 4 TO 7% ANNUALLY
419
00:23:53,075 --> 00:23:56,922
FROM 1983 TO ROUGHLY ABOUT 2000.
420
00:23:56,922 --> 00:23:58,641
AND WHAT WE'VE SEEN SINCE THEN
421
00:23:58,641 --> 00:24:01,951
IS THAT THE POPULATION GROWTH
HAS SLOWED DOWN A LITTLE BIT,
422
00:24:01,951 --> 00:24:04,258
BUT THERE'S CERTAINLY
NO INDICATION OF DECLINE.
423
00:24:04,258 --> 00:24:06,616
SO WE ARE NOW LOOKING
AT A POPULATION
424
00:24:06,616 --> 00:24:09,346
IN MUCH BETTER SHAPE
THAN THEY WERE IN THE 1970s.
425
00:24:14,443 --> 00:24:16,316
Narrator:
BUT IS GOOD NEWS FOR BEARS
426
00:24:16,349 --> 00:24:19,239
THE CAUSE OF THE TERRIBLE NEWS
FOR THE ELK?
427
00:24:21,561 --> 00:24:24,927
WITH THEIR NUMBERS GROWING
STEADILY IN THE LAST 30 YEARS,
428
00:24:24,927 --> 00:24:28,082
COULD GRIZZLIES BE OUR KILLERS
OF YOUNG ELK CALVES?
429
00:24:28,621 --> 00:24:31,278
CLEARLY THE NUMBER
OF MANY MORE GRIZZLIES
430
00:24:31,278 --> 00:24:33,909
WOULD HAVE SOME IMPACT
ON THE SURVIVAL OF THE ELK,
431
00:24:33,909 --> 00:24:35,508
ESPECIALLY CALVES.
432
00:24:35,778 --> 00:24:37,309
BUT THERE'S A PROBLEM.
433
00:24:37,309 --> 00:24:40,612
THE MOST DRAMATIC DECLINE
OF THE MIGRATING ELK HERD
434
00:24:40,612 --> 00:24:43,308
HAS TAKEN PLACE
IN THE LAST 10 YEARS...
435
00:24:43,309 --> 00:24:46,938
AND DURING THAT TIME THE GRIZZLY
POPULATION HAS HELD STEADY.
436
00:24:51,476 --> 00:24:55,013
SO NOW IT'S EVEN HARDER
TO PIN THE ELK MURDER MYSTERY
437
00:24:55,013 --> 00:24:56,446
ON A SINGLE PREDATOR,
438
00:24:56,446 --> 00:24:59,608
AND THE PROFILES OF OUR
POTENTIAL SERIAL KILLERS
439
00:24:59,608 --> 00:25:01,429
GET MURKIER.
440
00:25:01,430 --> 00:25:02,949
[BIRD SQUAWKING]
441
00:25:05,376 --> 00:25:07,575
[BEAR GROWLING]
442
00:25:08,021 --> 00:25:10,784
IN A WOLF-BEAR STANDOFF
OVER A CALF KILL,
443
00:25:10,785 --> 00:25:14,115
THE BEAR IS ALMOST ALWAYS
GOING TO WIN.
444
00:25:24,324 --> 00:25:26,746
BUT THAT DOESN'T
NECESSARILY TRANSLATE
445
00:25:26,746 --> 00:25:29,082
INTO AN ELK-HEAVY,
ALL-CARNIVORE DIET
446
00:25:29,082 --> 00:25:30,494
FOR THE BEARS.
447
00:25:30,504 --> 00:25:34,229
THE ANALYSIS OF THEIR HAIR
AND SCAT SAMPLES SHOW OTHERWISE.
448
00:25:37,397 --> 00:25:39,434
Van Manen: BASICALLY,
WHAT WE FOUND OUT
449
00:25:39,473 --> 00:25:41,565
WAS THAT IT WAS
INCREDIBLY DIVERSE.
450
00:25:41,565 --> 00:25:48,282
GRIZZLY BEARS CONSUMED 266
DIFFERENT SPECIES OF ORGANISMS.
451
00:25:48,282 --> 00:25:53,623
PLANTS, A NUMBER OF DIFFERENT
MAMMALS, FISH, INSECTS...
452
00:25:53,623 --> 00:25:56,923
IT'S AN INCREDIBLE VARIETY
OF SPECIES.
453
00:25:56,923 --> 00:26:00,532
WE CALL THEM OPPORTUNISTIC
OMNIVORES FOR A GOOD REASON.
454
00:26:01,460 --> 00:26:04,098
Narrator: AFTER THE 3 TO 5
MONTHS OF HIBERNATION
455
00:26:04,098 --> 00:26:06,554
THEY EVEN EAT DIRT...
VOLCANIC SOIL...
456
00:26:06,599 --> 00:26:08,724
TO JUMP-START
THEIR DIGESTIVE SYSTEMS.
457
00:26:08,781 --> 00:26:10,833
THE POTASSIUM AND MAGNESIUM
458
00:26:10,833 --> 00:26:13,726
MAY HELP KILL OFF PARASITES
THAT CAUSE DIARRHEA.
459
00:26:16,395 --> 00:26:19,750
BUT THEY NEED HUGE AMOUNTS
OF PROTEIN AND FAT AS WELL,
460
00:26:19,750 --> 00:26:21,902
AND A SURPRISING AMOUNT
OF THESE NUTRIENTS
461
00:26:21,902 --> 00:26:26,016
COMES FROM THE TINIEST OF PREY
IN THE STRANGEST OF PLACES.
462
00:26:31,063 --> 00:26:32,857
DURING THE SUMMER MONTHS,
463
00:26:32,857 --> 00:26:35,627
GRIZZLIES CLAMBER UP
PAST 9,000 FEET
464
00:26:35,628 --> 00:26:38,110
TO REACH PRECARIOUS SLOPES
OF LOOSE ROCK,
465
00:26:38,110 --> 00:26:40,045
OFTEN WITH YOUNG IN TOW.
466
00:26:40,306 --> 00:26:42,406
THEY'RE LOOKING
FOR LITTLE PACKETS OF FAT
467
00:26:42,447 --> 00:26:45,611
HIDING FROM THE SUN
AMONG THE ROCKS: MOTHS.
468
00:26:45,611 --> 00:26:47,251
ARMY CUTWORM MOTHS...
469
00:26:47,251 --> 00:26:49,354
COMMONLY KNOWN AS MILLER MOTHS.
470
00:26:49,354 --> 00:26:52,572
IN YELLOWSTONE, THE MOTHS
CAN MATE AND SPENT THE SUMMER
471
00:26:52,572 --> 00:26:54,569
IN THE SHADE
OF THE ROCKY MOUNTAINS.
472
00:26:56,519 --> 00:26:59,308
DURING THEIR STAY
THE MOTHS FATTEN UP
473
00:26:59,308 --> 00:27:01,125
ON THE NECTAR
OF THE RICH ALPINE MEADOWS...
474
00:27:01,240 --> 00:27:03,503
AND HIDE ON THE SLOPES.
475
00:27:06,713 --> 00:27:11,377
A SINGLE GRIZZLY BEAR CAN EAT
OVER 40,000 MOTHS A DAY.
476
00:27:11,377 --> 00:27:14,608
THAT'S ACTUALLY
20,000 CALORIES OF FAT!
477
00:27:19,911 --> 00:27:23,772
HOWEVER, THE LOOSE ROCK CAN MAKE
THIS AN UNNERVING FEAST...
478
00:27:23,772 --> 00:27:25,574
♪
479
00:27:34,617 --> 00:27:37,519
BUT GRIZZLIES CANNOT LIVE
BY MOTHS ALONE.
480
00:27:41,107 --> 00:27:44,427
Van Manen: WE SEE DIET
DIFFERENCES BASED ON INDIVIDUALS.
481
00:27:44,427 --> 00:27:46,497
EACH INDIVIDUAL
IS SLIGHTLY DIFFERENT.
482
00:27:46,529 --> 00:27:50,091
WE SEE DIFFERENCES BASED ON
WHERE YOU ARE IN THE ECOSYSTEM.
483
00:27:50,091 --> 00:27:53,064
WE SEE DIFFERENCES
BASED ON TIME,
484
00:27:53,064 --> 00:27:54,904
SO FROM ONE DAY TO THE NEXT
485
00:27:54,904 --> 00:27:56,763
THEY COULD BE CONSUMING
SOMETHING VERY DIFFERENT,
486
00:27:56,763 --> 00:27:58,824
FROM ONE SEASON
TO THE NEXT SEASON
487
00:27:58,824 --> 00:28:01,302
AND EVEN FROM ONE YEAR
TO THE NEXT YEAR.
488
00:28:02,719 --> 00:28:05,603
Narrator: WITH SO MANY
FOOD SOURCES TO CHOOSE FROM,
489
00:28:05,649 --> 00:28:08,860
WHY WOULD GRIZZLIES BE TAKING
MORE AND MORE ELK CALVES?
490
00:28:08,860 --> 00:28:12,677
IS SOMETHING IMPORTANT
ON THEIR MENU DISAPPEARING?
491
00:28:17,612 --> 00:28:20,251
IN YELLOWSTONE'S
WHITEBARK PINE FORESTS,
492
00:28:20,251 --> 00:28:23,744
SQUIRRELS ARE BUSY PREPARING
FOR THE LONG WINTER.
493
00:28:25,551 --> 00:28:27,790
AND THE SMART BEARS KNOW IT.
494
00:28:28,723 --> 00:28:31,488
WHILE SQUIRRELS FRENETICALLY
COLLECT AND STORE
495
00:28:31,496 --> 00:28:34,491
THE ENERGY-RICH SEEDS
OF THE WHITEBARK PINES,
496
00:28:34,664 --> 00:28:36,852
THE GRIZZLIES SIMPLY WAIT
497
00:28:39,324 --> 00:28:42,492
AND THEN DIG UP THEIR BURROWS
TO STEAL THE SEEDS.
498
00:28:43,017 --> 00:28:45,848
♪
499
00:28:54,132 --> 00:28:57,421
Van Manen: WHITEBARK PINE
IS AN IMPORTANT FOOD SPECIES
500
00:28:57,421 --> 00:28:58,601
FOR GRIZZLY BEARS.
501
00:28:58,601 --> 00:29:02,187
THEY ACTUALLY FEED ON
THE BIG SEEDS OF WHITEBARK PINE
502
00:29:02,187 --> 00:29:05,671
THAT ARE VERY RICH IN PROTEINS
AND FATS DURING THE FALL TIME,
503
00:29:05,671 --> 00:29:08,077
SO IT'S ALSO A FOOD SOURCE
THAT IS AVAILABLE
504
00:29:08,085 --> 00:29:10,302
DURING AN IMPORTANT TIME OF YEAR
FOR GRIZZLY BEARS,
505
00:29:10,302 --> 00:29:13,310
BECAUSE THAT'S WHEN THEY PREPARE
FOR HIBERNATION.
506
00:29:17,500 --> 00:29:20,601
Narrator: BUT THE WHITEBARK PINE
FORESTS ARE DYING.
507
00:29:20,601 --> 00:29:23,430
72% OF THE BIG TREES ARE GONE,
508
00:29:23,430 --> 00:29:26,536
MANY KILLED BY THE VORACIOUS
MOUNTAIN PINE BEETLE,
509
00:29:26,701 --> 00:29:29,098
WHICH IS THRIVING
BECAUSE OF GLOBAL WARMING.
510
00:29:30,133 --> 00:29:32,895
♪
511
00:29:39,625 --> 00:29:42,938
BUT PINE NUTS ARE IMPORTANT
TO THE BEARS ONLY IN THE FALL,
512
00:29:42,939 --> 00:29:44,633
BEFORE HIBERNATION,
513
00:29:44,633 --> 00:29:46,125
AND NOT IN THE SPRING,
514
00:29:46,125 --> 00:29:48,060
WHEN THE ELK CALVES
ARE DISAPPEARING.
515
00:29:54,675 --> 00:29:57,169
STILL, THE DECLINE
OF THE WHITEBARK PINE
516
00:29:57,169 --> 00:30:00,226
DOES PROVIDE AN IMPORTANT CLUE
IN THE PUZZLE:
517
00:30:00,226 --> 00:30:03,814
IT SHOWS HOW GRIZZLIES REACT
TO A VANISHING FOOD SOURCE.
518
00:30:05,824 --> 00:30:07,324
Van Manen:
WE WERE ABLE TO DEMONSTRATE
519
00:30:07,324 --> 00:30:10,553
THAT THEY'RE NOT USING
WHITEBARK PINE HABITATS
520
00:30:10,554 --> 00:30:12,027
AS MUCH AS THEY USED TO.
521
00:30:12,027 --> 00:30:14,074
SO WE HAVE SEEN
A RESPONSE TO THAT,
522
00:30:14,074 --> 00:30:15,941
BUT WE HAVEN'T SEEN
THAT THEY INCREASED
523
00:30:15,941 --> 00:30:17,566
THEIR HOME RANGES
OR THEIR MOVEMENTS,
524
00:30:17,566 --> 00:30:18,910
AND INSTEAD WHAT WE FOUND
525
00:30:18,910 --> 00:30:22,168
WAS THAT THEY SEEM TO BE FINDING
ALTERNATIVE FOOD SOURCES
526
00:30:22,168 --> 00:30:24,601
WITHIN THEIR
REGULAR HOME RANGES.
527
00:30:25,603 --> 00:30:28,438
Narrator: THE UPSHOT...
WHEN FACED WITH A FOOD CRISIS,
528
00:30:28,438 --> 00:30:30,883
BEARS DO NOT CHANGE
WHERE THEY EAT...
529
00:30:31,096 --> 00:30:33,817
THEY CHANGE WHAT THEY EAT.
530
00:30:35,578 --> 00:30:38,799
SO THE QUESTION BECOMES:
HAS SOMETHING DISAPPEARED
531
00:30:38,799 --> 00:30:40,766
FROM THE BEARS'
SPRING AND SUMMER MENU
532
00:30:40,766 --> 00:30:43,262
THAT'S MAKING THEM
TURN ELSEWHERE FOR FOOD,
533
00:30:43,262 --> 00:30:46,294
ESPECIALLY AMONG THE BEARS
THAT ENCOUNTER THE ELK HERDS
534
00:30:46,294 --> 00:30:49,005
JUST AS THE ELK
ARE GIVING BIRTH?
535
00:30:50,662 --> 00:30:53,512
THE ANSWER: A STUNNING YES.
536
00:30:57,771 --> 00:30:59,349
IN THE HAIR SAMPLES,
537
00:30:59,373 --> 00:31:02,394
VAN MANEN FINDS A HUGE CLUE
TO THE ELK MYSTERY.
538
00:31:02,394 --> 00:31:04,848
THEY SHOW THAT BEARS
AROUND YELLOWSTONE LAKE
539
00:31:04,881 --> 00:31:08,000
AREN'T EATING THE FISH THAT
USED TO DOMINATE THESE WATERS
540
00:31:08,024 --> 00:31:09,759
AND THEIR SPRING DIETS.
541
00:31:09,759 --> 00:31:12,665
Van Manen: FOR THOSE BEARS
NEAR YELLOWSTONE LAKE,
542
00:31:12,665 --> 00:31:16,352
CUTTHROAT TROUT WERE CERTAINLY
A PORTION OF THE DIET.
543
00:31:16,377 --> 00:31:19,680
AND NO DOUBT THAT THAT USE
DECLINED SUBSTANTIALLY.
544
00:31:20,519 --> 00:31:23,386
Narrator: IN THE LAST DECADE,
IT HAS BECOME CLEAR
545
00:31:23,386 --> 00:31:25,415
THAT SOMETHING HAS GONE
TERRIBLY WRONG
546
00:31:25,415 --> 00:31:27,272
IN YELLOWSTONE LAKE.
547
00:31:30,573 --> 00:31:33,909
ROBERT GRESSWELL
OF THE U.S. GEOLOGICAL SURVEY
548
00:31:33,909 --> 00:31:36,862
KNOWS THE FISH OF YELLOWSTONE
BETTER THAN ANYONE.
549
00:31:36,862 --> 00:31:40,585
AND HE'S BEEN WITNESS
TO A TRUE ECOLOGICAL CALAMITY...
550
00:31:40,768 --> 00:31:44,133
THE DISAPPEARANCE
OF THE NATIVE CUTTHROAT TROUT.
551
00:31:44,385 --> 00:31:48,456
Robert Gresswell: IN THE 1960s
THERE WERE THOUSANDS OF PEOPLE
552
00:31:48,456 --> 00:31:51,191
THAT WOULD SHOW UP TO FISH
ON FISHING BRIDGE.
553
00:31:51,191 --> 00:31:52,331
AND IT WAS DANGEROUS.
554
00:31:52,331 --> 00:31:56,278
I REMEMBER IN 1969,
WHEN I WORKED HERE,
555
00:31:56,279 --> 00:31:59,590
YOU DIDN'T DRIVE ACROSS THE
BRIDGE WITH YOUR WINDOW DOWN,
556
00:31:59,590 --> 00:32:02,595
BECAUSE YOU MIGHT GET HOOKED
BY SOMEBODY CASTING.
557
00:32:05,530 --> 00:32:08,362
Narrator: FISHING IS NOW
FORBIDDEN AT FISHING BRIDGE...
558
00:32:08,362 --> 00:32:09,733
BUT EVEN IF IT WEREN'T
559
00:32:09,733 --> 00:32:13,045
IT WOULD BE A MIRACLE
TO CATCH A CUTTHROAT TROUT.
560
00:32:20,062 --> 00:32:22,072
ISOLATED FROM OTHER CUTTHROAT
561
00:32:22,072 --> 00:32:25,674
WHEN THE LAST ICE AGE CREATED
THE IMPASSABLE LOWER FALLS,
562
00:32:25,674 --> 00:32:28,859
YELLOWSTONE'S CUTTHROAT
BECAME GENETICALLY DISTINCT
563
00:32:28,859 --> 00:32:31,768
AND THE FOUNDATION
OF A THRIVING ECOSYSTEM.
564
00:32:35,671 --> 00:32:38,287
FOR MILLENNIA, MILLIONS
OF YELLOWSTONE CUTTHROAT
565
00:32:38,319 --> 00:32:40,944
HAVE MIGRATED
UP THE LAKE TRIBUTARIES
566
00:32:40,944 --> 00:32:42,404
TO SPAWN IN LATE SPRING.
567
00:32:42,404 --> 00:32:44,602
AS MEMBERS OF THE SALMON FAMILY,
568
00:32:44,602 --> 00:32:47,458
THEY LIVE AND REPRODUCE
IN SHALLOW WATERS,
569
00:32:47,458 --> 00:32:51,020
WHICH MAKE THEM EASY TARGETS
NOT ONLY FOR HUNGRY BEARS.
570
00:32:52,404 --> 00:32:54,404
Gresswell:
THE YELLOWSTONE CUTTHROAT TROUT
571
00:32:54,404 --> 00:32:56,571
HAS A HUGE ROLE
IN THIS ECOSYSTEM
572
00:32:56,571 --> 00:32:58,077
AS A KEYSTONE SPECIES,
573
00:32:58,077 --> 00:33:01,566
AS A KEYSTONE PART
OF THE FOOD WEB.
574
00:33:07,557 --> 00:33:11,969
THERE ARE NUMEROUS,
IN ONE ESTIMATE 42 ANIMALS,
575
00:33:11,969 --> 00:33:14,541
THAT AT SOME POINT IN THEIR LIFE
576
00:33:14,541 --> 00:33:17,160
MAY FEED ON
YELLOWSTONE CUTTHROAT TROUT.
577
00:33:19,389 --> 00:33:22,624
Narrator: SPAWNING TIME
IS IN LATE MAY AND EARLY JUNE...
578
00:33:22,624 --> 00:33:24,476
PERFECT FOR
THE FAMISHED GRIZZLIES
579
00:33:24,476 --> 00:33:27,779
EMERGING FROM HIBERNATION
TO GET SOME PROTEIN.
580
00:33:28,406 --> 00:33:31,236
♪
581
00:33:38,450 --> 00:33:41,246
♪
582
00:33:43,938 --> 00:33:47,415
BUT SOMETHING SIGNIFICANT MUST
HAVE CHANGED IN THE LAST YEARS.
583
00:33:47,501 --> 00:33:48,665
BEARS AREN'T EATING
584
00:33:48,665 --> 00:33:51,392
ANYWHERE NEAR THE NUMBER
OF FISH THEY USED TO.
585
00:33:57,538 --> 00:34:01,328
WILDLIFE BIOLOGIST TODD KOEL
FROM THE NATIONAL PARK SERVICE
586
00:34:01,328 --> 00:34:04,199
HAS BEEN MONITORING THE NATIVE
CUTTHROAT TROUT FOR YEARS.
587
00:34:04,821 --> 00:34:06,649
HE TAKES ONE OF
HIS SONS WITH HIM
588
00:34:06,649 --> 00:34:09,259
TO VISIT A SPAWNING GROUND
NAMED CLEAR CREEK,
589
00:34:09,259 --> 00:34:11,835
WHERE HE'S INSTALLED
A COUNTING STATION.
590
00:34:11,923 --> 00:34:14,417
THE CHANGES ARE
SIMPLY DEVASTATING.
591
00:34:17,213 --> 00:34:19,744
Todd Koel: A DECADE AGO
WHEN I ARRIVED
592
00:34:19,744 --> 00:34:22,361
TO THESE SPAWNING STREAMS
HERE AROUND YELLOWSTONE LAKE,
593
00:34:22,361 --> 00:34:25,266
WE WOULD STILL SEE THOUSANDS
OF CUTTHROAT TROUT
594
00:34:25,276 --> 00:34:28,360
MIGRATING UP THEM
IN THE SPRING TO SPAWN.
595
00:34:29,881 --> 00:34:33,539
AT THAT TIME, YOU'D SEE
OSPREYS FLYING BY
596
00:34:33,540 --> 00:34:36,198
WITH CUTTHROAT TROUT
IN THEIR TALONS.
597
00:34:36,287 --> 00:34:39,178
IT WAS COMMON, ALL THE TIME.
598
00:34:40,202 --> 00:34:44,777
BUT EACH YEAR WHEN WE WOULD
RETURN AND MONITOR THE FISH,
599
00:34:44,777 --> 00:34:47,416
WE WOULD SEE LESS
AND LESS AND LESS.
600
00:34:47,434 --> 00:34:50,504
AND SO, DESPITE SPENDING
A LOT OF TIME OUT HERE,
601
00:34:50,762 --> 00:34:54,356
I HAVEN'T SEEN AN OSPREY
ON YELLOWSTONE LAKE NOW
602
00:34:54,733 --> 00:34:56,635
IN SEVERAL YEARS.
603
00:34:58,461 --> 00:35:00,916
Narrator: THE NUMBERS
CONFIRM THE AWFUL TRUTH.
604
00:35:00,916 --> 00:35:02,399
JUST 20 YEARS AGO,
605
00:35:02,399 --> 00:35:06,123
THERE WERE 50,000 CUTTHROAT
PASSING THROUGH CLEAR CREEK.
606
00:35:06,124 --> 00:35:10,294
IN 2014, THERE WERE ONLY
ABOUT 100 INDIVIDUALS.
607
00:35:14,865 --> 00:35:17,557
AND ROBERT GRESSWELL
SAW IT COMING.
608
00:35:18,246 --> 00:35:22,219
Gresswell: IN 1994
ONE OF THE RANGERS CAME UP,
609
00:35:22,623 --> 00:35:25,794
AND HE HAD A LAKE TROUT
IN HIS HANDS,
610
00:35:25,794 --> 00:35:29,742
AND HE SAID, "THIS LAKE TROUT
WAS JUST BROUGHT TO ME
611
00:35:30,252 --> 00:35:33,082
BY SOME ANGLERS
IN YELLOWSTONE LAKE,"
612
00:35:33,138 --> 00:35:37,934
AND I FELT LIKE SOMEBODY HAD
JUST PUNCHED ME IN THE STOMACH.
613
00:35:41,236 --> 00:35:44,918
Koel: LAKE TROUT ARE NON-NATIVE
TO YELLOWSTONE LAKE,
614
00:35:45,059 --> 00:35:47,791
AND THEY'RE
A VERY PREDATORY SPECIES.
615
00:35:47,791 --> 00:35:50,337
THEY'RE SORT OF LIKE WOLVES
ON THE LANDSCAPE,
616
00:35:50,337 --> 00:35:52,813
BUT IN A PLACE IN THE WATER
617
00:35:52,813 --> 00:35:54,673
WHERE THEY'RE NOT
SUPPOSED TO BE.
618
00:35:55,650 --> 00:35:58,485
Narrator: THE INVADING
AMERICAN LAKE TROUT IS HUGE,
619
00:35:58,517 --> 00:36:01,006
MUCH BIGGER
THAN THE NATIVE CUTTHROAT,
620
00:36:01,212 --> 00:36:02,881
AND INSATIABLE.
621
00:36:02,947 --> 00:36:06,873
A SINGLE LAKE TROUT CAN EAT
MORE THAN 40 CUTTHROAT A YEAR.
622
00:36:06,874 --> 00:36:09,601
AND NOW THEY'VE BROUGHT
THE YELLOWSTONE CUTTHROAT
623
00:36:09,601 --> 00:36:12,017
TO THE BRINK OF EXTINCTION.
624
00:36:12,947 --> 00:36:15,392
Koel: IN OTHER LAKES WHERE
LAKE TROUT HAVE BEEN INTRODUCED,
625
00:36:15,392 --> 00:36:18,586
THE NATIVE SPECIES
CAN BE EXTIRPATED COMPLETELY...
626
00:36:18,610 --> 00:36:20,158
BECOME EXTINCT...
627
00:36:20,158 --> 00:36:22,361
AND SO WHEN THE LAKE TROUT
WERE FIRST DISCOVERED HERE
628
00:36:22,361 --> 00:36:23,681
TWO DECADES AGO,
629
00:36:23,681 --> 00:36:25,283
THAT CAUSED HUGE ALARM
630
00:36:25,283 --> 00:36:27,837
BECAUSE OF WHAT WE'VE SEEN
HAPPEN AROUND US ALREADY
631
00:36:27,837 --> 00:36:29,571
IN THESE OTHER PLACES.
632
00:36:29,571 --> 00:36:31,767
Narrator: BUT HOW DOES THIS FIT
INTO THE MYSTERY?
633
00:36:31,767 --> 00:36:35,664
WHY WOULDN'T BEARS SIMPLY SWITCH
FROM ONE TROUT TO ANOTHER?
634
00:36:35,664 --> 00:36:38,668
THE ANSWER, AND THE FINAL CLUE
IN OUR MURDER MYSTERY,
635
00:36:38,668 --> 00:36:41,426
WAS WITHIN
THE SCIENTISTS' GRASP.
636
00:36:45,817 --> 00:36:47,534
THE TRAIL OF THE ELK KILLERS
637
00:36:47,534 --> 00:36:49,023
HAS LED THE PARK MANAGEMENT
638
00:36:49,023 --> 00:36:51,782
DEEP UNDER THE SURFACE
OF YELLOWSTONE LAKE.
639
00:36:52,817 --> 00:36:56,358
THE INVASIVE TROUT LIVE
AND REPRODUCE DEEP IN THE LAKE
640
00:36:56,358 --> 00:36:58,798
AND NEVER MIGRATE
TO SHALLOW WATERS.
641
00:36:58,798 --> 00:37:04,111
SO BALD EAGLES, OSPREYS,
AND BEARS CAN'T GET TO THEM.
642
00:37:06,676 --> 00:37:10,311
BUT IT HAS PROVIDED A VITAL CLUE
IN THE ELK MURDER MYSTERY:
643
00:37:10,481 --> 00:37:13,817
IF GRIZZLIES, EMERGING
FROM HIBERNATION IN THE SPRING,
644
00:37:13,817 --> 00:37:16,176
FIND THAT THEIR EASIEST
AND RICHEST SOURCE
645
00:37:16,176 --> 00:37:18,375
OF FAT AND PROTEIN
HAS DISAPPEARED,
646
00:37:18,375 --> 00:37:19,991
WHAT DO THEY DO?
647
00:37:22,294 --> 00:37:24,867
THEY WON'T MIGRATE
IN SEARCH OF OTHER FISH.
648
00:37:24,867 --> 00:37:27,720
THE BIOLOGISTS' STUDIES
HAVE SHOWN THAT.
649
00:37:27,859 --> 00:37:30,302
INSTEAD THEY'LL
STAND THEIR GROUND, ADAPT,
650
00:37:30,414 --> 00:37:33,820
AND FIND ANOTHER
RICH FOOD SOURCE ON LAND.
651
00:37:33,996 --> 00:37:35,906
[WOLF HOWLING]
652
00:37:36,601 --> 00:37:39,978
AND WHAT IS HAPPENING AROUND
YELLOWSTONE LAKE IN LATE SPRING,
653
00:37:40,002 --> 00:37:41,814
WHEN THE FISH FAIL TO APPEAR?
654
00:37:41,814 --> 00:37:44,071
THE MIGRATORY ELK HERDS
HAVE RETURNED
655
00:37:44,071 --> 00:37:47,010
TO THE LUSH HIGH MEADOWS
TO GIVE BIRTH.
656
00:37:58,296 --> 00:37:59,796
AND THE GRIZZLIES,
657
00:37:59,796 --> 00:38:01,781
FAR MORE ADEPT
AT HUNTING ELK CALVES
658
00:38:01,781 --> 00:38:03,796
THAN WOLVES
OR ANY OTHER PREDATOR,
659
00:38:03,796 --> 00:38:07,350
HAVE HAD NO CHOICE BUT TO
UP THE ANTE ON THE NEWBORNS...
660
00:38:07,374 --> 00:38:10,239
AND THE ELK POPULATION CRASHED.
661
00:38:10,653 --> 00:38:13,276
♪
662
00:38:23,079 --> 00:38:26,082
♪
663
00:38:31,087 --> 00:38:34,090
♪
664
00:38:42,340 --> 00:38:45,348
AND SO IT APPEARS
THAT THE LOWLY LAKE TROUT,
665
00:38:45,348 --> 00:38:49,512
NOT THE GREAT BEARS AND WOLVES,
ARE OUR SERIAL KILLERS.
666
00:38:52,384 --> 00:38:53,765
THE PARK MANAGEMENT
667
00:38:53,782 --> 00:38:57,182
HAS BEEN REMOVING
THE INVASIVE KILLERS EVER SINCE.
668
00:38:59,288 --> 00:39:01,140
LARGE GILL NETS,
669
00:39:01,140 --> 00:39:03,933
ADJUSTED TO THE SIZE
AND BEHAVIOR OF THE LAKE TROUT,
670
00:39:03,933 --> 00:39:06,295
ARE DEPLOYED DEEP IN THE WATER.
671
00:39:10,695 --> 00:39:12,487
THE LARGE MESH SIZES
672
00:39:12,487 --> 00:39:16,419
LET THE SMALLER CUTTHROAT TROUT
PASS THROUGH UNHARMED.
673
00:39:16,443 --> 00:39:19,308
♪
674
00:39:24,382 --> 00:39:27,109
EACH YEAR TENS OF THOUSANDS
OF LAKE TROUT
675
00:39:27,148 --> 00:39:29,286
HAVE BEEN REMOVED
FROM YELLOWSTONE LAKE,
676
00:39:29,286 --> 00:39:31,797
BUT THE CUTTHROAT NUMBERS
STILL COLLAPSED.
677
00:39:31,797 --> 00:39:35,038
IN 2007,
A SCIENCE PANEL CONVENED,
678
00:39:35,038 --> 00:39:37,533
HOPING TO AVERT DISASTER.
679
00:39:38,866 --> 00:39:43,993
Gresswell: THE PANEL UNANIMOUSLY
SUPPORTED THE CONTINUATION OF THE PROGRAM
680
00:39:43,993 --> 00:39:45,923
AND IN FACT RECOMMENDED
681
00:39:45,923 --> 00:39:49,411
THAT THE PARK SERVICE INCREASE
THE GILL-NETTING EFFORT.
682
00:39:50,166 --> 00:39:52,481
Koel: WE BEGAN GETTING
BIGGER BOATS,
683
00:39:52,481 --> 00:39:55,150
MORE NETS, LARGER CREWS.
684
00:39:55,150 --> 00:39:58,185
IT'S REALLY TURNED
INTO QUITE A MASSIVE EFFORT,
685
00:39:58,307 --> 00:40:02,156
AN AGGRESSIVE EFFORT, ACTUALLY,
TO BATTLE THESE LAKE TROUT.
686
00:40:02,558 --> 00:40:05,388
♪
687
00:40:11,429 --> 00:40:13,531
Narrator: THE SCIENTISTS
NEEDED TO FIND OUT
688
00:40:13,531 --> 00:40:15,293
WHERE THE LAKE TROUT
WERE COMING FROM.
689
00:40:15,293 --> 00:40:17,234
SO, THEY SAMPLED THE EAR BONES
690
00:40:17,234 --> 00:40:19,983
FROM THE OLDEST AND BIGGEST
OF THE LAKE TROUT.
691
00:40:25,408 --> 00:40:26,924
UNDER THE MICROSCOPE,
692
00:40:26,924 --> 00:40:29,463
THE EAR BONES SHOW GROWTH RINGS,
LIKE TREES...
693
00:40:29,463 --> 00:40:31,353
SHOWING HOW OLD
THE INVADERS WERE
694
00:40:31,353 --> 00:40:33,369
AND WHERE THEY CAME FROM.
695
00:40:34,111 --> 00:40:35,178
Gresswell: WHAT THEY FOUND
696
00:40:35,178 --> 00:40:39,174
WAS THAT THE CHEMICAL SIGNATURE
ACTUALLY CHANGED,
697
00:40:39,174 --> 00:40:44,236
AND THE OLDEST PART WAS SIMILAR
TO LEWIS LAKE,
698
00:40:44,236 --> 00:40:46,775
SO THESE FISH WERE ACTUALLY BORN
699
00:40:46,799 --> 00:40:49,327
AND LIVED THEIR EARLY LIFE
IN LEWIS LAKE,
700
00:40:49,327 --> 00:40:53,148
AND THEN APPARENTLY WERE MOVED
AT SOME POINT IN TIME
701
00:40:53,148 --> 00:40:54,820
INTO YELLOWSTONE LAKE.
702
00:40:55,616 --> 00:40:58,070
Narrator: BECAUSE NO RIVERS
CONNECT YELLOWSTONE LAKE
703
00:40:58,070 --> 00:40:58,951
TO LEWIS LAKE,
704
00:40:58,951 --> 00:41:02,087
THE INVASIVE TROUT COULDN'T HAVE
GOTTEN THERE ON THEIR OWN.
705
00:41:02,087 --> 00:41:05,152
THE CHEMICAL SIGNATURE SHOWED
THAT THEY'D BEEN DUMPED THERE
706
00:41:05,152 --> 00:41:07,692
SOMETIME IN THE MID-1980s.
707
00:41:09,280 --> 00:41:11,938
[THUNDER]
708
00:41:13,560 --> 00:41:16,804
NO ONE KNOWS WHO DUMPED THE FISH
IN THE LAKE OR WHY.
709
00:41:16,982 --> 00:41:18,646
IT MAY HAVE BEEN
SPORT FISHERMEN,
710
00:41:18,646 --> 00:41:21,002
LOOKING FOR BIGGER FISH TO FRY.
711
00:41:26,469 --> 00:41:29,686
IRONICALLY, THOUGH,
THE GUILT REACHES FURTHER BACK...
712
00:41:29,875 --> 00:41:31,672
TO WHEN THE U.S. FISH COMMISSION
713
00:41:31,672 --> 00:41:33,867
FIRST BROUGHT LAKE TROUT
INTO LEWIS LAKE
714
00:41:33,867 --> 00:41:36,032
MORE THAN A CENTURY AGO.
715
00:41:38,102 --> 00:41:40,452
Koel: THE FISH COMMISSION SAW IT
716
00:41:40,452 --> 00:41:43,826
AS AN OPPORTUNITY
TO BEGIN STOCKING.
717
00:41:44,118 --> 00:41:45,759
AT THE TIME THEY CALLED IT
718
00:41:45,759 --> 00:41:50,389
PLANTING OF FISHES
IN THESE FISHLESS WATERS.
719
00:41:50,390 --> 00:41:52,912
AND THIS WAY IS HOW LAKE TROUT
WERE INTRODUCED
720
00:41:52,912 --> 00:41:55,034
TO YELLOWSTONE NATIONAL PARK.
721
00:41:58,743 --> 00:42:00,807
Narrator: SO FAR,
MORE THAN ONE MILLION
722
00:42:00,807 --> 00:42:03,860
OF THE INVADING TROUT
HAVE BEEN NETTED AND KILLED.
723
00:42:04,315 --> 00:42:06,820
FOR DECADES IT HAS SEEMED
A LOSING BATTLE...
724
00:42:07,132 --> 00:42:09,651
AND THE CUTTHROAT
WERE DECIMATED.
725
00:42:10,651 --> 00:42:13,624
WITH TIME RUNNING OUT,
AND THE WHOLE ECOSYSTEM AT RISK,
726
00:42:13,624 --> 00:42:16,557
THE BIOLOGISTS NEEDED
A MORE AUDACIOUS PLAN.
727
00:42:20,075 --> 00:42:24,418
SO GRESSWELL AND HIS TEAM TAG
LAKE TROUT WITH GPS TRANSMITTERS
728
00:42:24,418 --> 00:42:26,840
AND FOLLOW THEM
TO THEIR SPAWNING GROUNDS.
729
00:42:34,192 --> 00:42:37,608
Gresswell: AS WE IDENTIFY WHERE
THESE LAKE TROUT ARE SPAWNING
730
00:42:37,609 --> 00:42:39,130
IN YELLOWSTONE LAKE,
731
00:42:39,130 --> 00:42:41,200
THEN WE CAN FOCUS
ON THOSE SPAWNERS
732
00:42:41,200 --> 00:42:43,215
DURING THAT PERIOD OF TIME.
733
00:42:44,824 --> 00:42:46,847
Narrator:
AFTER ONE YEAR OF TRACKING,
734
00:42:46,847 --> 00:42:50,160
THE RESEARCHERS FINALLY HONE IN
ON A MAJOR SPAWNING GROUND
735
00:42:50,160 --> 00:42:52,521
IN THE WATERS
OFF CARRINGTON ISLAND.
736
00:42:56,160 --> 00:42:59,114
AND A SPECIALLY DEVELOPED
DIVING ROBOT IS SENT IN
737
00:42:59,114 --> 00:43:01,484
TO DRIVE THE YOUNG FISH
INTO THE OPEN WATER
738
00:43:01,528 --> 00:43:03,457
USING MILD ELECTRO SHOCKS.
739
00:43:03,457 --> 00:43:06,810
MILLIONS OF NEARLY INVISIBLE
HATCHLINGS, WHEN GROWN,
740
00:43:06,811 --> 00:43:08,918
WILL EAT EVERYTHING IN SIGHT,
741
00:43:08,918 --> 00:43:12,110
AND THERE IS NO NATURAL PREDATOR
HERE THAT EATS THEM.
742
00:43:13,473 --> 00:43:14,662
Man: STOP.
743
00:43:17,075 --> 00:43:19,379
Gresswell: THIS IS ALL
REALLY IMPORTANT RESEARCH,
744
00:43:19,379 --> 00:43:21,485
BECAUSE ALL THE INFORMATION
WE HAVE NOW
745
00:43:21,485 --> 00:43:23,832
COMES FROM THE GREAT LAKES,
746
00:43:23,832 --> 00:43:28,693
AND THERE THERE ARE MANY MORE
EGG AND LARVAL FISH PREDATORS
747
00:43:28,693 --> 00:43:30,058
IN THE SYSTEM.
748
00:43:30,058 --> 00:43:32,996
AND EVERY INDICATION WE HAVE
IS THAT ONE OF THE REASONS
749
00:43:32,996 --> 00:43:36,051
WHY WE UNDERESTIMATED SO GREATLY
750
00:43:36,051 --> 00:43:39,814
THE POTENTIAL FOR THE LAKE TROUT
TO AFFECT THE CUTTHROAT TROUT
751
00:43:39,814 --> 00:43:41,998
IS THAT WE JUST HAD NO IDEA
752
00:43:41,998 --> 00:43:44,416
HOW FAST THAT POPULATION
WOULD EXPAND
753
00:43:44,416 --> 00:43:45,862
BECAUSE SURVIVAL OF YOUNG
754
00:43:45,862 --> 00:43:48,549
SEEMS TO BE MUCH, MUCH HIGHER
IN YELLOWSTONE LAKE
755
00:43:48,549 --> 00:43:51,487
BECAUSE THERE ARE
NO OTHER PREDATORS.
756
00:43:53,306 --> 00:43:55,861
Narrator: NOW THAT THEY'VE FOUND
THE SPAWNING GROUND,
757
00:43:55,861 --> 00:43:58,476
IT'S TIME TO BRING IN
THE HEAVY ARTILLERY:
758
00:43:58,476 --> 00:44:00,915
ELECTRIC PULSES KILL THE FRY,
759
00:44:00,915 --> 00:44:03,783
BEFORE THEY GROW LARGE ENOUGH
TO EAT THEIR WAY THROUGH
760
00:44:03,783 --> 00:44:06,077
TO THEIR NATIVE
CUTTHROAT COUSINS.
761
00:44:06,768 --> 00:44:09,563
♪
762
00:44:17,330 --> 00:44:19,561
AND NOW, FOR THE FIRST TIME,
763
00:44:19,561 --> 00:44:22,416
THERE MAY BE REAL REASON
FOR HOPE ON THE HORIZON.
764
00:44:22,416 --> 00:44:25,751
SLOWLY, THE INVASIVE LAKE TROUT
NUMBERS ARE FALLING.
765
00:44:28,168 --> 00:44:29,583
[OSPREY CHIRPING]
766
00:44:31,378 --> 00:44:33,104
♪
767
00:44:35,348 --> 00:44:38,936
AND THIS YEAR, ELK NUMBERS
ARE UP SIGNIFICANTLY...
768
00:44:38,936 --> 00:44:42,371
STILL NOWHERE NEAR
THE POPULATIONS OF 20 YEARS AGO,
769
00:44:42,371 --> 00:44:44,121
BUT THE HERD IS GROWING.
770
00:44:44,121 --> 00:44:46,351
IT'S TOO EARLY TO SAY
IF THE CONNECTION
771
00:44:46,351 --> 00:44:50,149
LEADS DIRECTLY FROM THE FISH
TO THE BEARS TO THE ELK MURDERS.
772
00:44:54,263 --> 00:44:56,226
BUT ONE THING IS SURE:
773
00:44:56,226 --> 00:44:59,303
NO SINGLE PREDATOR IS
MORE GUILTY IN THIS CURIOUS CASE
774
00:44:59,304 --> 00:45:01,307
THAN HUMANS.
775
00:45:02,409 --> 00:45:04,101
♪
776
00:45:10,693 --> 00:45:13,199
AND PERHAPS,
WITH A LITTLE BIT OF HELP,
777
00:45:13,199 --> 00:45:15,591
THE ANCIENT WISDOM
OF YELLOWSTONE
778
00:45:15,591 --> 00:45:19,057
IS ALREADY TURNING THE TIDE
AGAINST OUR SHORT-SIGHTEDNESS...
779
00:45:19,081 --> 00:45:21,309
AND THE WORLD'S
FIRST NATIONAL PARK
780
00:45:21,309 --> 00:45:24,822
WILL RETURN TO ITS
PRIMAL RHYTHMS ONCE AGAIN.
781
00:45:24,846 --> 00:45:27,641
♪
782
00:45:36,443 --> 00:45:39,170
♪
783
00:45:45,901 --> 00:45:48,766
♪
784
00:46:00,467 --> 00:46:03,194
♪
61394
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