Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated:
1
00:00:03,004 --> 00:00:06,805
Narrator: In all the oceans of the world,
2
00:00:06,841 --> 00:00:10,709
this shark is known as most dangerous to people.
3
00:00:14,682 --> 00:00:17,850
It has a jaw full of razor-sharp teeth.
4
00:00:20,121 --> 00:00:23,122
Man: It just came out
of the water and bit my arm.
5
00:00:26,460 --> 00:00:28,927
Narrator: And a nasty disposition.
6
00:00:30,831 --> 00:00:32,364
(shouting)
7
00:00:32,400 --> 00:00:33,599
man: Whoa!
8
00:00:35,236 --> 00:00:38,537
Narrator: The bull shark hunts where we play.
9
00:00:41,342 --> 00:00:43,308
(muffled scream)
10
00:00:43,344 --> 00:00:46,912
and now, it's on the move.
11
00:00:48,582 --> 00:00:52,885
Man: Bull sharks have no trouble
being upriver in freshwater.
12
00:00:52,920 --> 00:00:54,486
(scream)
13
00:00:54,522 --> 00:00:58,557
narrator: Coming soon to a shore near you.
14
00:00:58,592 --> 00:01:02,261
Man: I don't think they realize
that the sharks are here.
15
00:01:02,296 --> 00:01:05,631
♪ ♪
16
00:01:08,636 --> 00:01:12,471
♪ ♪
17
00:01:12,506 --> 00:01:15,441
narrator: Great whites may have a fearsome reputation.
18
00:01:18,145 --> 00:01:21,513
But out of more than 400 species of shark,
19
00:01:21,549 --> 00:01:24,616
there's one that is considered even more dangerous.
20
00:01:27,421 --> 00:01:31,090
It's the bull shark.
21
00:01:31,125 --> 00:01:32,658
A creature with a reputation
22
00:01:32,693 --> 00:01:35,060
for being exceptionally aggressive.
23
00:01:38,933 --> 00:01:40,899
Mike heithaus: I kind of
think of bull sharks
24
00:01:40,935 --> 00:01:44,169
as the pit bulls of the oceans.
25
00:01:44,205 --> 00:01:47,039
They are probably more
impressive predators
26
00:01:47,074 --> 00:01:50,642
than other sharks that
are the same length.
27
00:01:50,644 --> 00:01:51,977
Most sharks will
only attack prey
28
00:01:52,012 --> 00:01:55,013
that's maybe 10%, 15%
of their own body size.
29
00:01:55,049 --> 00:01:58,984
For bull sharks, all bets are
off, because they are so strong.
30
00:02:01,655 --> 00:02:03,622
Narrator: Aggressive...
31
00:02:03,657 --> 00:02:05,257
Fast...
32
00:02:05,292 --> 00:02:06,792
And fearless.
33
00:02:10,798 --> 00:02:13,899
Bulls are a threat wherever they're found.
34
00:02:18,739 --> 00:02:22,774
Charles bangley:
The distribution of
the bull shark is worldwide.
35
00:02:22,810 --> 00:02:25,010
If I had one word to
sum up the bull shark,
36
00:02:25,045 --> 00:02:27,646
it would be adaptable.
37
00:02:27,681 --> 00:02:32,417
That makes them kind of unique
among a lot of shark species.
38
00:02:32,453 --> 00:02:37,723
Narrator: The bull shark favors warm, shallow waters,
39
00:02:37,758 --> 00:02:40,759
making it a danger to swimmers around the world.
40
00:02:44,965 --> 00:02:49,401
And it's likely responsible for more attacks than we realize.
41
00:02:51,138 --> 00:02:53,138
♪ ♪
42
00:02:53,174 --> 00:02:58,510
♪ ♪
43
00:02:58,546 --> 00:03:04,917
♪ ♪
44
00:03:04,952 --> 00:03:07,586
June 2015.
45
00:03:07,621 --> 00:03:11,857
16-year-old hunter treschl enjoys a day at the beach.
46
00:03:13,727 --> 00:03:15,727
Hunter treschl:
I was in oak island
for a family vacation.
47
00:03:15,763 --> 00:03:18,430
We'd just taken like
a day trip down there.
48
00:03:18,465 --> 00:03:20,832
Me and my cousin and my grandma.
49
00:03:22,603 --> 00:03:26,305
And we had been there for
probably like three, four hours.
50
00:03:29,643 --> 00:03:33,478
So, I was just
kind of walking out,
51
00:03:33,514 --> 00:03:35,547
getting ready to wash off.
52
00:03:39,053 --> 00:03:42,454
And I stop about
waist-high water.
53
00:03:44,358 --> 00:03:46,592
And the water was like
super murky at this point
54
00:03:46,627 --> 00:03:49,661
because there was
a storm offshore.
55
00:03:49,697 --> 00:03:52,798
So, I could see kinda
my upper thighs and that's it.
56
00:03:52,833 --> 00:03:54,800
♪ ♪
57
00:03:54,835 --> 00:04:00,772
♪ ♪
58
00:04:00,808 --> 00:04:04,176
I knelt down, crouched down,
maybe 50 feet from shore.
59
00:04:09,016 --> 00:04:12,150
I felt this solid bump
on my ankles.
60
00:04:12,186 --> 00:04:17,356
♪ ♪
61
00:04:17,391 --> 00:04:19,958
I assumed it was a stingray.
62
00:04:19,994 --> 00:04:21,593
That's like a pretty normal
thing to have happen
63
00:04:21,629 --> 00:04:24,997
down in north carolina.
64
00:04:25,032 --> 00:04:26,965
I started backing up.
65
00:04:27,001 --> 00:04:30,002
♪ ♪
66
00:04:30,037 --> 00:04:36,575
♪ ♪
67
00:04:36,610 --> 00:04:37,976
and that's the first
moment when I realized
68
00:04:38,012 --> 00:04:39,978
that it wasn't a stingray.
69
00:04:44,485 --> 00:04:46,585
It was a shark.
70
00:04:48,322 --> 00:04:51,156
It just came out of the water
and bit my arm.
71
00:04:53,694 --> 00:04:56,762
Grabbed me toward
the bottom of my arm,
72
00:04:56,797 --> 00:05:00,299
took the arm below the elbow
in that first bite.
73
00:05:04,605 --> 00:05:07,339
And then it was just gone,
just like that.
74
00:05:21,989 --> 00:05:24,356
I was awake through
this whole thing.
75
00:05:26,293 --> 00:05:28,493
There was a crowd around.
76
00:05:28,529 --> 00:05:32,664
There were people with towels
trying to stop the bleeding.
77
00:05:32,700 --> 00:05:34,633
Narrator: Hunter couldn't identify the kind of shark
78
00:05:34,668 --> 00:05:37,769
that attacked him.
79
00:05:37,805 --> 00:05:39,971
But based on the size of his wounds,
80
00:05:40,007 --> 00:05:44,176
experts make a pretty good guess:
81
00:05:44,211 --> 00:05:46,945
A bull shark.
82
00:05:46,980 --> 00:05:48,280
Hunter: They estimated it being
83
00:05:48,315 --> 00:05:51,316
about seven and a half
to eight and a half feet long.
84
00:05:53,020 --> 00:05:54,186
Prior to the attack,
85
00:05:54,221 --> 00:05:57,923
I didn't actually know
much about bull sharks.
86
00:05:57,958 --> 00:06:00,926
Now after my attack, I feel like
I've learned a lot more.
87
00:06:00,961 --> 00:06:05,497
They are one of the more
aggressive breeds of shark.
88
00:06:05,532 --> 00:06:08,934
I'm super lucky to have gotten
out from that experience alive.
89
00:06:12,106 --> 00:06:13,739
Narrator: Researchers have confirmed
90
00:06:13,774 --> 00:06:16,842
100 bull shark attacks.
91
00:06:18,645 --> 00:06:23,215
But the real number may be much higher,
92
00:06:23,250 --> 00:06:26,818
because the bull shark is so difficult to identify.
93
00:06:30,357 --> 00:06:32,023
Mike: When you first
look at a bull shark,
94
00:06:32,059 --> 00:06:34,893
it doesn't really jump out
at you that it's a bull shark.
95
00:06:34,928 --> 00:06:36,628
It just kind of looks like
other sharks, you know,
96
00:06:36,663 --> 00:06:38,964
kind of grayish-brown on top,
white below.
97
00:06:38,999 --> 00:06:41,733
That's really different
from an iconic species
98
00:06:41,769 --> 00:06:44,903
like the tiger shark that
has that really square head
99
00:06:44,938 --> 00:06:49,441
and those stripes that set it
apart from any other species.
100
00:06:49,476 --> 00:06:51,576
Then you also have white sharks,
101
00:06:51,612 --> 00:06:53,712
nobody's gonna mistake
a white shark,
102
00:06:53,747 --> 00:06:56,248
this is a really iconic look.
103
00:06:56,283 --> 00:06:59,017
You have the torpedo shape,
the tail,
104
00:06:59,052 --> 00:07:02,554
the bright white belly,
kind of slate gray above.
105
00:07:04,591 --> 00:07:09,694
Narrator: The bull shark's looks aren't showy or iconic.
106
00:07:09,730 --> 00:07:13,632
But if you know what to look for, you'll never forget it.
107
00:07:15,669 --> 00:07:18,703
Mike: When you really start to
look closer at the bull sharks,
108
00:07:18,739 --> 00:07:23,942
you see some features that
differ from typical shark shape.
109
00:07:23,977 --> 00:07:26,645
They almost look like
swimming mouths at times.
110
00:07:26,680 --> 00:07:30,382
They're really thick from
those pectoral fins forward,
111
00:07:30,417 --> 00:07:32,083
you know, huge jaws,
112
00:07:32,119 --> 00:07:35,754
and then they've got
the musculature to back that up.
113
00:07:42,329 --> 00:07:45,297
Narrator: June 2005.
114
00:07:45,332 --> 00:07:48,333
16-year-old craig hutto
and his brother, brian,
115
00:07:48,368 --> 00:07:51,870
are fishing in waist-deep water
30 yards from shore.
116
00:07:55,509 --> 00:07:59,978
Craig hutto: We were making
our way kinda in the gully.
117
00:08:00,013 --> 00:08:03,582
I really didn't have
any worries or anything.
118
00:08:08,322 --> 00:08:11,590
Something came up underwater,
I didn't see anything.
119
00:08:13,927 --> 00:08:16,862
Something bumped me
on my left leg.
120
00:08:20,968 --> 00:08:24,836
Something grabbed me on my right
leg and took me underwater.
121
00:08:29,076 --> 00:08:31,710
It's just like that going
into shock right then,
122
00:08:31,745 --> 00:08:34,980
is kinda my whole body
just went numb.
123
00:08:36,750 --> 00:08:41,019
Brian hutto: That's when I saw
its back come out of the water.
124
00:08:42,523 --> 00:08:48,126
There's this fin that just
kinda sweeps up and grabs him
125
00:08:48,161 --> 00:08:50,295
and rolls over on top of him.
126
00:08:53,133 --> 00:08:54,900
Craig: My first
real instinct was
127
00:08:54,935 --> 00:08:58,403
I need to get this
shark off of me.
128
00:08:58,438 --> 00:09:01,273
I've heard from somebody saying
that a shark's tooth is so sharp
129
00:09:01,308 --> 00:09:04,609
that it can bite you
and you not even feel it.
130
00:09:04,645 --> 00:09:06,144
And I think that's
what happened to my hands
131
00:09:06,179 --> 00:09:10,048
'cause in a split second
I put my hands down.
132
00:09:10,083 --> 00:09:12,250
I looked up at my hands
and it was just,
133
00:09:12,286 --> 00:09:16,021
my hands were just cut open,
just torn to pieces.
134
00:09:21,662 --> 00:09:24,129
Narrator: The shark releases craig for a moment,
135
00:09:24,164 --> 00:09:27,399
giving his brother enough time to drag him to shore.
136
00:09:30,671 --> 00:09:35,206
It takes five months for craig's hands to heal.
137
00:09:35,242 --> 00:09:38,810
But his right leg is too damaged to save.
138
00:09:43,383 --> 00:09:48,420
The only warning he had for the attack was a bump on his leg.
139
00:09:51,391 --> 00:09:53,325
Mike: Now a lot of times
when we think about sharks,
140
00:09:53,360 --> 00:09:56,094
we think about, you know,
maybe mindless eating machines
141
00:09:56,129 --> 00:09:58,863
just charging in
to grab things right away.
142
00:09:58,899 --> 00:10:02,067
But that's not always
what they do.
143
00:10:02,135 --> 00:10:04,369
Narrator: The bull shark uses its bump to test
144
00:10:04,404 --> 00:10:08,740
whether its victim is going to fight back.
145
00:10:08,775 --> 00:10:10,175
Mike: When they see something
and they're not sure
146
00:10:10,210 --> 00:10:11,843
if it's prey or not, they might
do something like this,
147
00:10:11,878 --> 00:10:13,745
which is just give it
that little bump
148
00:10:13,780 --> 00:10:15,780
so they can figure out,
you know, is this something
149
00:10:15,816 --> 00:10:20,785
I want to eat or something
I want to just leave alone?
150
00:10:20,821 --> 00:10:23,555
Narrator: If the bull shark's bump isn't challenged,
151
00:10:23,590 --> 00:10:26,891
it then moves in for the kill.
152
00:10:26,927 --> 00:10:28,426
George burgess: They'll come
back to do the bite,
153
00:10:28,462 --> 00:10:33,498
which usually is in
the lower quadrant of the body.
154
00:10:33,533 --> 00:10:36,368
Narrator: Making the bull shark's bite so devastating:
155
00:10:36,403 --> 00:10:40,705
An arsenal of razor-sharp teeth.
156
00:10:40,741 --> 00:10:41,973
George: On each of these teeth,
157
00:10:42,009 --> 00:10:44,376
there's little serrations
on each side,
158
00:10:44,411 --> 00:10:46,177
so when the animal bites,
159
00:10:46,213 --> 00:10:50,148
it not only uses
the pointed tips to cut,
160
00:10:50,183 --> 00:10:53,551
but those serrated teeth
get into the flesh
161
00:10:53,587 --> 00:10:57,722
and then they literally
cut off what they want.
162
00:10:59,726 --> 00:11:01,459
Mike: As they shift their jaw,
163
00:11:01,495 --> 00:11:03,662
it can kind of cut
and slice as well
164
00:11:03,697 --> 00:11:06,364
and cut out big chunks
of their prey.
165
00:11:08,869 --> 00:11:13,238
Narrator: The bull shark has 50 functional teeth,
166
00:11:13,273 --> 00:11:16,408
with up to 6 replacement teeth in each row.
167
00:11:16,443 --> 00:11:20,679
That's up to 300 teeth in its mouth at any given time.
168
00:11:23,717 --> 00:11:27,185
A bull shark might grow as many as 65,000 teeth
169
00:11:27,220 --> 00:11:30,021
in its lifetime.
170
00:11:30,057 --> 00:11:34,392
But as soon as it loses one, another rises in its place.
171
00:11:36,830 --> 00:11:39,564
George: You can see
the replacement teeth.
172
00:11:39,599 --> 00:11:43,234
Behind each tooth there's
a row of other teeth.
173
00:11:43,270 --> 00:11:46,905
And every two weeks or so
a new tooth comes in from behind
174
00:11:46,940 --> 00:11:52,143
and it keeps making teeth
for its entire life.
175
00:11:52,179 --> 00:11:53,778
Narrator: It's not just the teeth that make
176
00:11:53,814 --> 00:11:57,182
a bull shark's bite so killer.
177
00:11:57,217 --> 00:12:00,351
Its power comes from its jaw structure.
178
00:12:03,090 --> 00:12:06,591
Mike: Their mouth is kinda back
in under the snout a little bit,
179
00:12:06,626 --> 00:12:09,461
so if it just opened
the lower jaw,
180
00:12:09,496 --> 00:12:13,264
it would be really hard
for it to get something big.
181
00:12:13,300 --> 00:12:15,667
But the bull sharks kinda
protrude their jaw forward
182
00:12:15,702 --> 00:12:17,235
when they open their mouth.
183
00:12:19,806 --> 00:12:25,643
And so then they can clamp on to
prey, including really big prey.
184
00:12:25,679 --> 00:12:28,113
Narrator: Like tarpons,
185
00:12:28,148 --> 00:12:30,281
turtle shells,
186
00:12:30,317 --> 00:12:32,150
other sharks,
187
00:12:32,185 --> 00:12:34,853
and sometimes, people.
188
00:12:40,060 --> 00:12:43,661
Biologist dr. Brady barr has tested the bite force
189
00:12:43,697 --> 00:12:46,731
of some of the world's biggest predators,
190
00:12:46,766 --> 00:12:49,601
including sharks.
191
00:12:49,636 --> 00:12:51,970
Brady barr: Oh, look at that!
192
00:12:52,005 --> 00:12:54,038
Narrator: Now he's after a great white
193
00:12:54,074 --> 00:12:56,274
off the coast of south africa.
194
00:12:56,309 --> 00:12:58,476
Brady: Whoa, come on, baby.
195
00:12:58,512 --> 00:12:59,677
Narrator: They've got one,
196
00:12:59,713 --> 00:13:03,648
about 4,000 pounds and 16 feet long.
197
00:13:03,683 --> 00:13:05,450
Brady: Whoa!
198
00:13:09,990 --> 00:13:12,657
Got it, got it, we got a bite,
we got a bite!
199
00:13:15,462 --> 00:13:18,997
Narrator: He reads the pounds of force per square inch.
200
00:13:20,901 --> 00:13:22,867
Brady: I mean, 669.
201
00:13:22,903 --> 00:13:25,003
That is a heck of a bite!
202
00:13:28,241 --> 00:13:30,441
Narrator: Next up: Testing the bite force
203
00:13:30,477 --> 00:13:34,546
of a much smaller bull shark off the coast of florida.
204
00:13:34,581 --> 00:13:36,114
Brady: Careful!
205
00:13:39,920 --> 00:13:41,519
Oh, look at the size of that!
206
00:13:41,555 --> 00:13:44,455
That is a monster bull shark!
207
00:13:44,491 --> 00:13:46,224
Narrator: Which bite is stronger?
208
00:13:46,259 --> 00:13:49,761
The great white or the bull shark?
209
00:13:49,796 --> 00:13:51,029
Brady: Whoa!
210
00:13:56,069 --> 00:13:56,935
Narrator: Biologist dr. Brady barr is off the coast
211
00:13:58,638 --> 00:14:01,172
of florida to test the bite strength
212
00:14:01,208 --> 00:14:03,274
of a fearsome bull shark.
213
00:14:06,046 --> 00:14:07,612
Brady: So the idea is you're
just gonna pull the shark's head
214
00:14:07,647 --> 00:14:08,980
up out of the water,
215
00:14:09,015 --> 00:14:11,583
and I'll stick the bite force
meter down in there.
216
00:14:13,220 --> 00:14:15,320
I'm using the bite force meter
217
00:14:15,355 --> 00:14:17,355
that I normally use
for crocodiles.
218
00:14:17,390 --> 00:14:20,558
I'm gonna get a digital read-out
here of pounds of force.
219
00:14:20,594 --> 00:14:22,760
And this shark is angry
and it's a bull shark.
220
00:14:22,796 --> 00:14:25,296
I have a feeling we're
gonna get a huge bite!
221
00:14:28,335 --> 00:14:30,134
Come on, open your mouth!
222
00:14:32,772 --> 00:14:34,873
Look at those teeth!
223
00:14:34,908 --> 00:14:37,709
Oh, 989!
224
00:14:37,744 --> 00:14:39,878
989 pounds!
225
00:14:39,913 --> 00:14:43,414
That's literally half
a ton of bite force
226
00:14:43,450 --> 00:14:47,185
from a 300-pound bull shark!
227
00:14:47,220 --> 00:14:49,320
Narrator: The bull is less than half the length
228
00:14:49,356 --> 00:14:52,657
and only a third of the weight of a great white.
229
00:14:52,692 --> 00:14:57,161
But its bite is more than 300 pounds of force stronger.
230
00:14:59,566 --> 00:15:03,968
The bull's head is wider than most other shark heads.
231
00:15:04,004 --> 00:15:06,671
That extra width means more muscle,
232
00:15:06,706 --> 00:15:10,675
which means more jaw strength.
233
00:15:10,744 --> 00:15:12,143
George: There's
a great deal of weight
234
00:15:12,178 --> 00:15:14,779
used in the biting process,
235
00:15:14,848 --> 00:15:17,882
simply because of
the mass of the head.
236
00:15:22,756 --> 00:15:24,455
Narrator: The bull shark's bite is greater
237
00:15:24,491 --> 00:15:26,724
than any other shark.
238
00:15:26,760 --> 00:15:31,029
It can exert 1,300 pounds toward the back of the jaw
239
00:15:31,064 --> 00:15:34,165
and over 450 pounds up front.
240
00:15:35,635 --> 00:15:39,003
How it deploys all that force is also unique,
241
00:15:39,039 --> 00:15:42,707
with terrifying savagery.
242
00:15:42,742 --> 00:15:45,343
George: What makes bull sharks
distinct from other species
243
00:15:45,378 --> 00:15:49,247
of sharks is the aggressiveness
of their attacks.
244
00:15:51,985 --> 00:15:54,452
Narrator: July 6, 2001.
245
00:15:56,756 --> 00:15:59,424
8-year-old jessie arbogast and his cousins
246
00:15:59,459 --> 00:16:02,727
play in the shallow waters off pensacola, florida.
247
00:16:04,631 --> 00:16:06,698
(screaming)
248
00:16:09,369 --> 00:16:12,370
suddenly, an enormous bull shark bites down
249
00:16:12,405 --> 00:16:15,206
on jessie's right arm
250
00:16:15,241 --> 00:16:17,075
and begins to shake.
251
00:16:17,110 --> 00:16:22,547
♪ ♪
252
00:16:22,582 --> 00:16:27,418
it tears the arm from his body,
253
00:16:27,454 --> 00:16:30,989
and goes on to rip off a large piece of his thigh.
254
00:16:31,024 --> 00:16:37,095
♪ ♪
255
00:16:37,130 --> 00:16:41,499
jessie's uncle grabs the 7-foot animal by the tail
256
00:16:41,534 --> 00:16:44,602
and drags it onto the beach.
257
00:16:44,637 --> 00:16:47,505
A park ranger shoots the shark.
258
00:16:47,540 --> 00:16:51,809
They find jessie's arm still in its mouth, intact.
259
00:17:00,720 --> 00:17:04,722
Surgeons reattach the arm.
260
00:17:04,758 --> 00:17:08,559
But severe blood loss leaves jessie brain damaged.
261
00:17:11,264 --> 00:17:16,834
In just a few seconds, his life has been changed forever
262
00:17:16,870 --> 00:17:21,239
by two bites from this aggressive bull shark.
263
00:17:21,274 --> 00:17:25,676
George: Bull sharks will come
back for second and third bites.
264
00:17:25,712 --> 00:17:30,715
In many cases will finish off
their victim one way or another.
265
00:17:30,750 --> 00:17:34,886
We very frequently hear that the
shark was following the victim
266
00:17:34,921 --> 00:17:37,021
right up to the shoreline.
267
00:17:39,459 --> 00:17:41,959
Mike: If you're a bull shark and
you're attacking something big,
268
00:17:41,995 --> 00:17:44,529
you're likely to make bites
in fairly rapid succession
269
00:17:44,564 --> 00:17:47,131
because if it starts
to get too far away,
270
00:17:47,167 --> 00:17:50,802
it may maneuver enough
to avoid that killing bite.
271
00:17:53,606 --> 00:17:56,974
Narrator: An attack can be lightning quick.
272
00:17:57,010 --> 00:18:00,711
A bull shark cruises slowly near the bottom.
273
00:18:00,747 --> 00:18:06,217
It's capable of achieving a burst up to 11 miles per hour.
274
00:18:06,252 --> 00:18:08,453
Mike: If you're prey,
a bull shark's on top of you
275
00:18:08,488 --> 00:18:10,455
before you know it.
276
00:18:15,261 --> 00:18:17,829
Narrator: In August 2000,
277
00:18:17,864 --> 00:18:21,699
69-year-old thadeus kubinski and his wife anna
278
00:18:21,734 --> 00:18:25,136
decide to go for a quick swim in the inlet behind their home
279
00:18:25,171 --> 00:18:27,605
in boca ciega bay, florida.
280
00:18:31,978 --> 00:18:35,713
Thadeus jumps in first.
281
00:18:35,748 --> 00:18:40,118
He swims in five feet of water, yards from the dock.
282
00:18:40,153 --> 00:18:42,153
♪ ♪
283
00:18:42,188 --> 00:18:48,192
♪ ♪
284
00:18:48,228 --> 00:18:54,999
♪ ♪
285
00:18:55,034 --> 00:18:58,269
suddenly, he's attacked by a shark.
286
00:18:59,572 --> 00:19:03,174
It kills kubinski with a bite into his chest,
287
00:19:03,209 --> 00:19:05,610
15 inches across.
288
00:19:07,780 --> 00:19:12,950
Authorities recover a shark tooth from kubinski's body.
289
00:19:12,986 --> 00:19:15,086
It belongs to a bull,
290
00:19:15,121 --> 00:19:19,690
estimated to be nearly 9 feet long and 400 pounds.
291
00:19:21,628 --> 00:19:24,395
As big as it was,
292
00:19:24,430 --> 00:19:27,131
kubinski never saw it coming.
293
00:19:31,004 --> 00:19:36,207
Mike: So, you can see here,
that shark is almost invisible,
294
00:19:36,242 --> 00:19:40,978
and it just kind of
materializes out of nowhere.
295
00:19:41,014 --> 00:19:42,480
Narrator: In the murky water,
296
00:19:42,515 --> 00:19:46,350
the quick-swimming bull shark can sneak up on anyone.
297
00:19:46,386 --> 00:19:50,688
Even the most experienced swimmers.
298
00:19:50,723 --> 00:19:57,461
♪ ♪
299
00:19:57,497 --> 00:20:00,798
shark biologist greg skomal knows firsthand
300
00:20:00,833 --> 00:20:03,467
the dangers of swimming with bull sharks.
301
00:20:07,140 --> 00:20:09,407
Greg skomal:
My name's greg skomal.
I'm a shark biologist.
302
00:20:09,442 --> 00:20:10,675
I'm affiliated with
303
00:20:10,710 --> 00:20:12,376
the massachusetts division
of marine fisheries.
304
00:20:12,412 --> 00:20:16,013
I've been studying sharks
for over 30 years.
305
00:20:16,049 --> 00:20:18,015
Narrator: Skomal's latest project:
306
00:20:18,051 --> 00:20:19,917
Tagging a variety of sharks
307
00:20:19,953 --> 00:20:23,087
to see if their movements are impacted by weather.
308
00:20:26,259 --> 00:20:28,793
Greg: Gotcha, gotcha!
309
00:20:28,828 --> 00:20:31,295
It's on, woo-hoo!
310
00:20:31,331 --> 00:20:34,065
Narrator: He tags a dangerous tiger shark.
311
00:20:38,037 --> 00:20:42,039
Now skomal wants to tag an even more aggressive shark,
312
00:20:42,075 --> 00:20:43,608
a bull.
313
00:20:46,779 --> 00:20:48,346
Greg: Bull sharks
arrive here every day,
314
00:20:48,381 --> 00:20:53,384
so I'm hoping to get a tag on
one of these animals underwater.
315
00:20:53,419 --> 00:20:56,254
Narrator: Skomal has decades of experience.
316
00:20:56,289 --> 00:21:00,992
He knows tagging a bull shark is risky business.
317
00:21:01,027 --> 00:21:03,060
Greg: Now I've got to admit
that getting in the water
318
00:21:03,096 --> 00:21:05,896
with bull sharks,
I've got my concerns.
319
00:21:05,932 --> 00:21:09,934
I'm certainly going to be
keeping my eye open.
320
00:21:09,969 --> 00:21:11,969
Narrator: But today skomal just may be
321
00:21:12,005 --> 00:21:14,572
putting his life on the line.
322
00:21:14,607 --> 00:21:17,575
Just because you can't see a bull shark
323
00:21:17,610 --> 00:21:20,478
doesn't mean it can't see you.
324
00:21:26,386 --> 00:21:29,053
Narrator: Research scientist dr. Greg skomal
325
00:21:29,088 --> 00:21:31,489
swims in the bahamas,
326
00:21:31,524 --> 00:21:31,922
hoping to find a bull shark before it finds him.
327
00:21:39,132 --> 00:21:42,099
Skomal swims just below the surface.
328
00:21:42,135 --> 00:21:48,606
♪ ♪
329
00:21:48,641 --> 00:21:51,442
greg: I can't see anything down here.
330
00:21:59,385 --> 00:22:01,118
Wait, wait! Whoa, whoa! Whoa, whoa! What is that?
331
00:22:01,154 --> 00:22:05,022
Is that a bull shark coming at me?!
332
00:22:05,058 --> 00:22:06,791
I'm coming up, I'm coming up!
333
00:22:06,826 --> 00:22:10,094
♪ ♪
334
00:22:10,129 --> 00:22:16,100
♪ ♪
335
00:22:16,135 --> 00:22:22,640
♪ ♪
336
00:22:22,675 --> 00:22:26,711
narrator: Skomal's experiment has to wait.
337
00:22:26,746 --> 00:22:28,346
In such poor visibility,
338
00:22:28,381 --> 00:22:32,950
the risk of an attack is far too great.
339
00:22:32,985 --> 00:22:35,920
Greg: Frankly, I'm not
super comfortable
340
00:22:35,955 --> 00:22:39,690
with bull sharks in places
where I can't see them!
341
00:22:39,726 --> 00:22:41,258
Narrator: It's a good call.
342
00:22:41,294 --> 00:22:44,195
In murky water, the bull shark's super senses
343
00:22:44,230 --> 00:22:46,397
give it a clear advantage.
344
00:22:46,432 --> 00:22:48,966
Mike: Bull sharks have
incredible sensory systems,
345
00:22:49,001 --> 00:22:52,870
so murky water for them
is no trouble.
346
00:22:52,905 --> 00:22:54,372
George: The bull shark
is pre-adapted
347
00:22:54,407 --> 00:22:56,474
for these conditions
348
00:22:56,509 --> 00:22:58,309
where it can rely
on other senses
349
00:22:58,344 --> 00:23:00,745
other than just pure eyesight.
350
00:23:02,382 --> 00:23:05,383
Narrator: Sharks are literally wired for hunting.
351
00:23:05,418 --> 00:23:08,152
Special pores around their faces detect
352
00:23:08,187 --> 00:23:12,790
the electrical currents coming from other animals,
353
00:23:12,825 --> 00:23:14,592
allowing bull sharks to hunt
354
00:23:14,627 --> 00:23:17,328
without relying on their eyesight.
355
00:23:19,866 --> 00:23:23,200
George: Bull sharks,
they have tiny little eyes,
356
00:23:23,236 --> 00:23:27,104
and they rely more on their
senses of smell and hearing
357
00:23:27,140 --> 00:23:30,808
in detecting movements.
358
00:23:30,843 --> 00:23:34,912
And so, they do particularly
well in turbid water,
359
00:23:34,947 --> 00:23:39,517
which is the norm at the mouths
of rivers and in estuaries.
360
00:23:39,552 --> 00:23:41,285
Mike: For a predator
like a bull shark,
361
00:23:41,320 --> 00:23:43,921
an estuary is really great
362
00:23:43,956 --> 00:23:46,557
because you've got all those
nutrients coming out of rivers
363
00:23:46,592 --> 00:23:50,094
and off the land,
lots of plankton, sea grass,
364
00:23:50,129 --> 00:23:53,731
and that feeds tons of fish.
365
00:23:53,766 --> 00:23:55,099
George: Bull sharks
instantly become
366
00:23:55,134 --> 00:23:57,501
the largest predator
in the area.
367
00:23:57,537 --> 00:24:00,604
And they're able to find
ample food supplies
368
00:24:00,640 --> 00:24:04,275
that others cannot.
369
00:24:04,310 --> 00:24:07,278
Narrator: Unlike other sharks, the bull shark doesn't
370
00:24:07,313 --> 00:24:11,382
just swim outside the mouth of a river.
371
00:24:11,417 --> 00:24:14,518
It can swim into the river itself.
372
00:24:17,457 --> 00:24:19,590
That's because bull sharks are armed
373
00:24:19,625 --> 00:24:23,327
with an astonishing adaptation:
374
00:24:23,362 --> 00:24:27,598
They can survive in saltwater and freshwater.
375
00:24:29,335 --> 00:24:33,170
Mike: Bull sharks can actually
change their physiology enough
376
00:24:33,206 --> 00:24:35,739
to survive under these
two incredibly different
377
00:24:35,775 --> 00:24:39,243
sets of conditions.
378
00:24:39,278 --> 00:24:43,948
Narrator: Sharks need salt inside their bodies to survive.
379
00:24:43,983 --> 00:24:46,050
As they enter freshwater,
380
00:24:46,085 --> 00:24:50,421
the internal salt levels become diluted.
381
00:24:50,456 --> 00:24:54,024
The lack of salt causes the shark's cells to expand
382
00:24:54,060 --> 00:24:56,860
and their bodies to bloat,
383
00:24:56,863 --> 00:24:58,295
killing them.
384
00:25:00,166 --> 00:25:05,002
But the bull shark has a gland toward the tail
385
00:25:05,037 --> 00:25:08,973
that shuts down to hold salt in.
386
00:25:09,008 --> 00:25:11,275
While its long, specialized kidneys work
387
00:25:11,310 --> 00:25:14,345
to reuse the salt already in the body.
388
00:25:16,015 --> 00:25:19,316
Mike: So unlike other sharks,
the bull sharks can switch
389
00:25:19,352 --> 00:25:22,319
back and forth between
being good in freshwater
390
00:25:22,355 --> 00:25:25,823
and being good in the ocean.
391
00:25:25,858 --> 00:25:27,925
Narrator: This supreme adaptability allows
392
00:25:27,960 --> 00:25:31,328
these wandering sharks to use more waterways
393
00:25:31,364 --> 00:25:34,798
where they encounter people.
394
00:25:34,834 --> 00:25:37,268
George: The bull shark
likes to live in the areas
395
00:25:37,303 --> 00:25:39,336
where we like to go
in the water.
396
00:25:39,372 --> 00:25:43,607
So, as a result, the number of
attacks involving bull sharks
397
00:25:43,643 --> 00:25:45,843
is pretty high,
398
00:25:45,878 --> 00:25:50,748
and the results can be
quite catastrophic.
399
00:25:50,783 --> 00:25:52,383
(scream)
400
00:25:52,418 --> 00:25:53,551
mike: When people think
about sharks,
401
00:25:53,586 --> 00:25:56,287
they tend to think
about deep water.
402
00:25:56,322 --> 00:25:58,956
But some of these predators
get into really shallow waters.
403
00:25:58,991 --> 00:26:00,457
Bull sharks will hunt in water
404
00:26:00,493 --> 00:26:05,696
that looks like it's just barely
deep enough for them to swim in.
405
00:26:05,731 --> 00:26:08,599
That's where prey are found,
and when you lock on to it,
406
00:26:08,634 --> 00:26:11,735
the prey has less dimensions
to try to escape.
407
00:26:14,373 --> 00:26:15,806
Narrator: Bull sharks don't just live
408
00:26:15,841 --> 00:26:19,610
in the world's tropical oceans.
409
00:26:19,645 --> 00:26:23,280
The bull shark's invasion into freshwater expands its range
410
00:26:23,316 --> 00:26:25,382
beyond that of other sharks,
411
00:26:25,418 --> 00:26:28,986
to rivers, lakes, and freshwater streams.
412
00:26:32,592 --> 00:26:33,924
Man: Oh!
413
00:26:33,960 --> 00:26:36,727
Mike: Bull sharks get found
in what are amazing places
414
00:26:36,762 --> 00:26:38,295
to people all around the world.
415
00:26:38,331 --> 00:26:40,864
You've got populations
in lake nicaragua,
416
00:26:40,900 --> 00:26:43,801
they probably live there
their whole life there.
417
00:26:43,836 --> 00:26:47,104
Couple thousand miles
up the amazon river.
418
00:26:47,139 --> 00:26:49,707
Heck, in northern australia,
they had some bull sharks
419
00:26:49,742 --> 00:26:53,510
that were living for a fairly
long time in a golf course pond
420
00:26:53,546 --> 00:26:56,880
after they'd gotten swept in
in a flood.
421
00:26:56,916 --> 00:26:59,683
The zambezi river
in south africa,
422
00:26:59,719 --> 00:27:03,220
where you have animals
that are 12, 13 feet long,
423
00:27:03,255 --> 00:27:06,624
just huge predators.
424
00:27:06,659 --> 00:27:09,793
Narrator: Here in south africa,
425
00:27:09,829 --> 00:27:12,730
bull sharks aren't afraid to spar with creatures
426
00:27:12,765 --> 00:27:15,099
more than twice their size.
427
00:27:20,706 --> 00:27:22,573
Narrator: The estuaries of south africa's
428
00:27:22,608 --> 00:27:24,942
isimangaliso wetland park
429
00:27:24,977 --> 00:27:28,312
support some of the world's most imposing creatures.
430
00:27:30,182 --> 00:27:31,515
Elephants,
431
00:27:31,550 --> 00:27:32,983
black rhinos,
432
00:27:33,019 --> 00:27:35,352
nile crocodiles,
433
00:27:35,388 --> 00:27:37,154
and hippos.
434
00:27:42,294 --> 00:27:44,395
Upriver from the indian ocean,
435
00:27:44,430 --> 00:27:47,765
10 massive adult hippos take a swim.
436
00:27:51,103 --> 00:27:53,671
Then notice an intruder.
437
00:27:55,875 --> 00:27:58,075
Mike: If there's an animal
in africa not to mess with,
438
00:27:58,110 --> 00:27:59,576
hippos are right at the top.
439
00:27:59,612 --> 00:28:02,346
But, you know, this shark is
just kind of swimming around
440
00:28:02,381 --> 00:28:04,982
and checking out hippos.
441
00:28:06,619 --> 00:28:07,985
Narrator: Hippos kill more humans
442
00:28:08,020 --> 00:28:11,955
than any other african animal.
443
00:28:11,991 --> 00:28:16,126
This smaller bull shark isn't fazed by their size.
444
00:28:18,664 --> 00:28:21,331
Mike: You can see the shark just
kind of circling around here
445
00:28:21,367 --> 00:28:26,470
and the hippos are definitely
keeping an eye on this shark.
446
00:28:26,505 --> 00:28:31,141
♪ ♪
447
00:28:31,177 --> 00:28:37,848
♪ ♪
448
00:28:37,883 --> 00:28:41,685
narrator: Suddenly, the shark makes a bold, aggressive move.
449
00:28:47,393 --> 00:28:50,561
But moves on when the hippos gang up.
450
00:28:53,899 --> 00:28:55,532
Mike: This is incredible.
451
00:28:55,568 --> 00:28:58,769
You would never expect to see
bull sharks and hippos,
452
00:28:58,804 --> 00:29:02,906
but you do because those sharks
can get into freshwater.
453
00:29:06,879 --> 00:29:09,480
Narrator: Signs of the bull shark are found in rivers
454
00:29:09,515 --> 00:29:15,085
all around the world, including the united states.
455
00:29:15,121 --> 00:29:18,622
♪ ♪
456
00:29:18,657 --> 00:29:22,893
♪ ♪
457
00:29:22,928 --> 00:29:26,864
for the past 40 years, waterman john "willy" dean
458
00:29:26,899 --> 00:29:29,099
has made his living fishing the tidal waters
459
00:29:29,135 --> 00:29:33,170
of the potomac river, a mile from the chesapeake bay.
460
00:29:35,741 --> 00:29:39,676
Every morning, he checks his nets for menhaden, croakers,
461
00:29:39,712 --> 00:29:43,614
and anything else that swims in.
462
00:29:43,649 --> 00:29:44,915
Willy: It's like a grab bag.
463
00:29:44,950 --> 00:29:47,518
You never know what
you're going to have.
464
00:29:47,553 --> 00:29:50,220
That's what makes it
so interesting.
465
00:29:50,256 --> 00:29:51,655
Just hold her there, greg.
466
00:29:51,690 --> 00:29:53,257
Greg: I'm holding it.
467
00:29:53,292 --> 00:29:54,424
Willy: A lot of crabs in there.
468
00:29:54,460 --> 00:29:56,994
Greg: Mm-hm.
469
00:29:57,029 --> 00:30:00,464
Narrator: On a routine haul in August 2013,
470
00:30:00,499 --> 00:30:04,535
willy and his son greg pull up the catch of their lives.
471
00:30:07,540 --> 00:30:10,073
Willy: We were coming out
to fish the net that day,
472
00:30:10,109 --> 00:30:14,178
doing just what we're doing now,
473
00:30:14,213 --> 00:30:19,049
and when we got pulling
this side up here,
474
00:30:19,084 --> 00:30:22,019
we noticed some
thrashing in the water.
475
00:30:22,054 --> 00:30:25,923
And I told the boys, I said,
"we got something in here today.
476
00:30:25,958 --> 00:30:27,925
And it ain't little."
477
00:30:30,396 --> 00:30:34,331
as we started getting the net
up, we got a glimpse of it.
478
00:30:34,366 --> 00:30:37,801
And we realized we had
a shark in here.
479
00:30:42,208 --> 00:30:45,909
First thing I think is, how
can I get him out of this net
480
00:30:45,945 --> 00:30:50,681
as quick as possible,
so he doesn't eat the net up?
481
00:30:50,716 --> 00:30:55,285
He would hit the net so hard
he was shaking the poles.
482
00:30:55,321 --> 00:30:59,122
His tail section,
he was flipping!
483
00:30:59,158 --> 00:31:01,058
That's a lot of power.
484
00:31:01,093 --> 00:31:04,862
Don't want to let
your guard down.
485
00:31:04,897 --> 00:31:07,130
Narrator: Just when the shark is under control,
486
00:31:07,166 --> 00:31:11,401
the deans notice they have another problem.
487
00:31:11,437 --> 00:31:13,270
Greg: As we were pulling
the one in the boat,
488
00:31:13,305 --> 00:31:16,039
we saw the second one.
489
00:31:16,075 --> 00:31:18,075
We all looked at each other
and realized, yo, hey,
490
00:31:18,110 --> 00:31:20,244
we got to get ready to get
this second one now, too.
491
00:31:25,784 --> 00:31:30,954
I weigh about 225, and, yeah,
it was a struggle that day.
492
00:31:30,990 --> 00:31:35,659
The tail was pretty scary
because of the force behind it.
493
00:31:35,694 --> 00:31:38,962
The entire time, all we heard
was just him chomping his jaws.
494
00:31:41,233 --> 00:31:43,967
Narrator: Each bull is over 8 feet
495
00:31:44,003 --> 00:31:48,171
and weighs in at 300 pounds.
496
00:31:48,207 --> 00:31:49,740
Greg: I never would imagine
to think there would be one
497
00:31:49,775 --> 00:31:52,175
right here, so close,
you know, where I grew up at.
498
00:31:52,211 --> 00:31:54,578
Never in a million years
would have thought it.
499
00:31:56,448 --> 00:31:58,749
Narrator: Two enormous bull sharks.
500
00:31:58,784 --> 00:32:02,486
Not in the ocean, but up a freshwater river,
501
00:32:02,521 --> 00:32:05,455
just a quick swim from beachgoers.
502
00:32:07,359 --> 00:32:12,162
Willy: This is where everybody
comes to go swimming.
503
00:32:12,197 --> 00:32:16,333
This park is usually packed.
504
00:32:16,368 --> 00:32:20,437
I don't think they realize
that the sharks are here.
505
00:32:22,441 --> 00:32:26,376
Kind of makes you reluctant to
want to go swimming very much.
506
00:32:29,315 --> 00:32:30,647
Narrator: Since the deans pulled in
507
00:32:30,683 --> 00:32:34,384
their two bull sharks, scientists have recorded
508
00:32:34,420 --> 00:32:38,488
other bull shark sightings along the chesapeake.
509
00:32:38,524 --> 00:32:39,790
Charles: In the chesapeake bay,
510
00:32:39,825 --> 00:32:41,625
most of the bull sharks
that are sighted,
511
00:32:41,660 --> 00:32:42,759
particularly in
the potomac river,
512
00:32:42,795 --> 00:32:44,194
tend to be very large
individuals,
513
00:32:44,229 --> 00:32:46,730
8 or 9 feet or greater.
514
00:32:46,765 --> 00:32:49,566
Narrator: There's a good reason why bull sharks head inland
515
00:32:49,601 --> 00:32:52,469
up waterways like this.
516
00:32:52,504 --> 00:32:54,771
And it's not for prey.
517
00:32:54,807 --> 00:32:58,108
The sharks are here to make more sharks.
518
00:33:03,082 --> 00:33:05,782
Narrator: Each year, the waterways of the southern united states
519
00:33:05,818 --> 00:33:08,785
get some dangerous visitors:
520
00:33:08,821 --> 00:33:11,788
Bull sharks...
521
00:33:11,824 --> 00:33:12,923
Coming to breed.
522
00:33:16,128 --> 00:33:17,728
Mike: A pregnant
female bull shark
523
00:33:17,763 --> 00:33:20,030
will swim into coastal waters,
524
00:33:20,065 --> 00:33:22,332
maybe into the mouth
of a river and estuary,
525
00:33:22,368 --> 00:33:24,668
and she'll have her pups.
526
00:33:24,703 --> 00:33:28,972
Those pups have been growing
inside her for about a year.
527
00:33:29,008 --> 00:33:32,075
Narrator: Bulls give birth to around eight pups per litter
528
00:33:32,111 --> 00:33:35,312
in the safety of these nurseries.
529
00:33:35,347 --> 00:33:38,315
George: By definition,
nursery areas are rich in food
530
00:33:38,350 --> 00:33:40,984
so the young can grow.
531
00:33:41,020 --> 00:33:45,689
And they also are areas
where the danger is lower
532
00:33:45,724 --> 00:33:49,993
of being eaten
by larger predators.
533
00:33:50,029 --> 00:33:56,266
♪ ♪
534
00:33:56,301 --> 00:33:59,269
narrator: River fish expert and national geographic explorer
535
00:33:59,304 --> 00:34:02,773
zeb hogan has traveled to australia's outback
536
00:34:02,808 --> 00:34:07,878
to see if he can find proof of baby bulls in freshwater.
537
00:34:07,913 --> 00:34:10,981
Zeb: We're at our fishing spot
and what a nice spot to fish!
538
00:34:14,820 --> 00:34:17,754
Narrator: Zeb's daytime attempts are a bust.
539
00:34:20,192 --> 00:34:23,727
But after sundown, something shifts.
540
00:34:28,167 --> 00:34:30,667
Zeb: Oh, something pulling.
541
00:34:33,772 --> 00:34:35,972
It's coming towards us.
542
00:34:39,845 --> 00:34:41,878
Whoa! This is big, this is big!
543
00:34:41,914 --> 00:34:43,780
Whatever this is, it's big!
544
00:34:46,685 --> 00:34:49,186
It really was pulling line
at the beginning there.
545
00:34:49,221 --> 00:34:51,188
I haven't seen it
break the surface yet,
546
00:34:51,223 --> 00:34:54,791
but might be a shark!
547
00:34:54,827 --> 00:34:56,359
Little bull shark!
548
00:34:56,395 --> 00:34:59,963
Man, long time coming,
finally got one.
549
00:34:59,998 --> 00:35:01,665
Look at this thing!
550
00:35:04,303 --> 00:35:05,836
Wow!
551
00:35:05,871 --> 00:35:12,742
♪ ♪
552
00:35:12,778 --> 00:35:17,214
small bull shark,
probably about a meter long.
553
00:35:17,249 --> 00:35:21,151
World record size would be
about 800 to 1,000 pounds.
554
00:35:21,186 --> 00:35:24,154
So, this is a very young shark.
555
00:35:24,156 --> 00:35:28,592
Narrator: Zeb has discovered a bull shark nursery.
556
00:35:28,627 --> 00:35:32,929
One day the babies here may threaten swimmers far away.
557
00:35:35,267 --> 00:35:37,334
Mike: They'll be in
these freshwater systems
558
00:35:37,369 --> 00:35:40,237
for maybe three to five years.
559
00:35:40,272 --> 00:35:43,073
Then once they're big enough,
they'll leave the river systems
560
00:35:43,108 --> 00:35:45,609
and start living
in coastal waters.
561
00:35:48,881 --> 00:35:50,914
Narrator: Bull sharks have always lived in rivers
562
00:35:50,949 --> 00:35:54,718
and close to the coast.
563
00:35:54,753 --> 00:35:58,021
A bull shark may have been responsible for a string
564
00:35:58,056 --> 00:36:01,091
of the deadliest inland attacks in history.
565
00:36:02,895 --> 00:36:04,394
Mike: You had so many
attacks clustered
566
00:36:04,429 --> 00:36:06,563
in such a short period of time,
567
00:36:06,598 --> 00:36:10,000
that started to get the public
perception of sharks
568
00:36:10,035 --> 00:36:15,605
as dangerous, and ultimately
was an inspiration for jaws.
569
00:36:15,641 --> 00:36:16,973
(scream)
570
00:36:21,079 --> 00:36:23,547
narrator: More than a hundred years ago,
571
00:36:23,582 --> 00:36:27,217
shark attacks were virtually unknown in america.
572
00:36:28,787 --> 00:36:31,588
George: At that time,
there was a school of thought
573
00:36:31,623 --> 00:36:35,492
that sharks don't attack humans.
574
00:36:35,527 --> 00:36:39,863
In fact, a person put
a high reward out for anybody
575
00:36:39,898 --> 00:36:43,500
who could prove that
sharks attack humans.
576
00:36:47,739 --> 00:36:51,608
Narrator: July 1, 1916.
577
00:36:51,643 --> 00:36:57,247
Just off the coast of long beach island, new jersey,
578
00:36:57,282 --> 00:37:01,818
a shark attacks and kills 25-year-old charles vansant.
579
00:37:06,158 --> 00:37:09,693
Five days later and 45 miles north,
580
00:37:09,728 --> 00:37:15,599
27-year-old charles bruder is attacked not far from shore.
581
00:37:15,667 --> 00:37:19,536
His abdomen is ripped open and both legs are severed.
582
00:37:23,208 --> 00:37:25,575
The unprecedented back-to-back killings
583
00:37:25,611 --> 00:37:27,944
leave the public shaken.
584
00:37:30,148 --> 00:37:35,218
Eleven days later, there's a third attack,
585
00:37:35,254 --> 00:37:38,989
but not in the atlantic ocean.
586
00:37:39,024 --> 00:37:41,424
Matawan creek, new jersey.
587
00:37:41,460 --> 00:37:44,628
15 miles inland from the jersey shore.
588
00:37:47,399 --> 00:37:50,600
A group of boys are playing
589
00:37:50,636 --> 00:37:54,904
when a shark grabs 11-year-old lester stilwell
590
00:37:54,940 --> 00:37:57,507
and pulls him under.
591
00:37:57,542 --> 00:37:58,575
(screams)
592
00:38:04,316 --> 00:38:08,985
a good samaritan tries to recover the body.
593
00:38:09,021 --> 00:38:11,688
But a shark kills him, too.
594
00:38:13,659 --> 00:38:18,361
30 minutes later, a shark attacks another boy.
595
00:38:18,397 --> 00:38:21,931
This teen manages to escape with his life.
596
00:38:24,503 --> 00:38:26,936
Mike: One of the things that
to me is really interesting
597
00:38:26,972 --> 00:38:30,273
about the 1916 attacks
in new jersey
598
00:38:30,309 --> 00:38:34,411
is the attacks that
occurred so far upstream.
599
00:38:34,446 --> 00:38:36,746
That's the kind of habitat
you wouldn't really think
600
00:38:36,782 --> 00:38:38,148
a great white would be in.
601
00:38:38,183 --> 00:38:41,017
I mean, that seems
more like a bull shark.
602
00:38:43,922 --> 00:38:47,157
Narrator: The river attacks in new jersey were lethal...
603
00:38:47,192 --> 00:38:48,658
But rare.
604
00:38:50,629 --> 00:38:52,395
In another part of the world,
605
00:38:52,431 --> 00:38:56,333
people risk their lives every time they enter the water.
606
00:39:03,375 --> 00:39:05,875
Narrator: The ganges river basin,
607
00:39:05,911 --> 00:39:08,111
west bengal, india.
608
00:39:10,515 --> 00:39:13,817
For many of the 400 million people living here,
609
00:39:13,852 --> 00:39:13,917
the murky river is an important source of income.
610
00:39:20,258 --> 00:39:24,160
It also holds a danger:
611
00:39:24,196 --> 00:39:26,896
Bull sharks.
612
00:39:26,932 --> 00:39:29,766
Mike: When you see a big
bull shark in the caribbean
613
00:39:29,801 --> 00:39:33,336
or the atlantic, they are big,
impressive predators,
614
00:39:33,372 --> 00:39:35,271
but get over to
the indian ocean,
615
00:39:35,307 --> 00:39:40,243
and they get three feet longer
and way more massive.
616
00:39:40,278 --> 00:39:43,213
So, you get from
an impressive predator
617
00:39:43,248 --> 00:39:47,917
to a truly amazing
apex predator.
618
00:39:52,657 --> 00:39:56,259
Narrator: The sharks clash with humans in these river systems.
619
00:40:01,400 --> 00:40:05,769
And leave their signatures on the unlucky.
620
00:40:05,804 --> 00:40:10,640
George: Victims oftentimes reach
down and go to try to defend
621
00:40:10,675 --> 00:40:12,842
themselves from whatever
is biting them.
622
00:40:12,878 --> 00:40:16,279
And in doing so,
they often get defensive wounds.
623
00:40:16,314 --> 00:40:20,517
And they're analogous to what
we see in stabbing incidents
624
00:40:20,552 --> 00:40:26,656
where the victim reaches out
to defend themselves.
625
00:40:26,691 --> 00:40:32,262
If one examines the wounds, one
often can find telltale signs
626
00:40:32,297 --> 00:40:34,964
that a bull shark has attacked.
627
00:40:35,000 --> 00:40:37,967
The serrated teeth
often lead to injuries
628
00:40:38,003 --> 00:40:42,939
on particularly the long bones
of the leg or arm.
629
00:40:42,974 --> 00:40:44,941
And as the tooth hits the bone,
630
00:40:44,976 --> 00:40:48,311
it leaves very distinctive
serrated marks.
631
00:40:52,284 --> 00:40:55,919
Narrator: Now you understand the power of the bull shark,
632
00:40:55,954 --> 00:40:57,720
beware.
633
00:40:57,756 --> 00:41:01,090
There's more chance than ever you'll encounter one.
634
00:41:05,297 --> 00:41:07,163
Charles: There are a number of
nursery habitats for bull sharks
635
00:41:07,199 --> 00:41:09,399
that have been identified
in us waters.
636
00:41:09,434 --> 00:41:11,000
A lot of them are
in the gulf of mexico,
637
00:41:11,036 --> 00:41:13,503
ranging from texas
up to louisiana,
638
00:41:13,538 --> 00:41:15,071
over to western florida.
639
00:41:15,106 --> 00:41:16,906
On the east coast,
probably the most heavily used
640
00:41:16,941 --> 00:41:19,275
nursery habitat is
the indian river lagoon
641
00:41:19,311 --> 00:41:22,111
that stretches along a lot
of the east coast of florida.
642
00:41:22,147 --> 00:41:24,981
And more recently, there have
been an increasing number
643
00:41:25,016 --> 00:41:28,017
of juveniles born in
pamlico sound, north carolina.
644
00:41:30,989 --> 00:41:35,091
Narrator: Bull sharks favor the tropics.
645
00:41:35,126 --> 00:41:37,026
And climate change is inviting them
646
00:41:37,062 --> 00:41:39,529
to more waterways than ever.
647
00:41:42,067 --> 00:41:44,100
They're on the move.
648
00:41:45,670 --> 00:41:49,739
Mike: Climate change is going
to affect the oceans profoundly.
649
00:41:49,774 --> 00:41:53,076
As waters warm, what that's
going to do is expand the range
650
00:41:53,111 --> 00:41:55,912
over which a lot of
tropical species can live.
651
00:41:55,947 --> 00:41:58,815
So, animals like bull sharks
that like warm water,
652
00:41:58,850 --> 00:42:00,250
they're going to be able to move
653
00:42:00,285 --> 00:42:01,784
into those higher
latitude areas.
654
00:42:01,820 --> 00:42:04,487
They're going to be able to move
north along the us coast
655
00:42:04,523 --> 00:42:08,691
as the conditions
become more favorable.
656
00:42:08,727 --> 00:42:10,026
Narrator: As that happens,
657
00:42:10,061 --> 00:42:13,897
swimmers off the northeast coast may soon see
658
00:42:13,932 --> 00:42:16,766
two apex predators in their waters.
659
00:42:19,004 --> 00:42:22,171
George: We're going to be seeing
the bull shark range impinging
660
00:42:22,207 --> 00:42:25,742
on what was traditional
white shark territory.
661
00:42:27,445 --> 00:42:28,778
More humans in the water,
662
00:42:28,813 --> 00:42:31,614
more sharks in those
particular waters
663
00:42:31,650 --> 00:42:34,584
is a formula for more bites.
664
00:42:38,290 --> 00:42:40,690
Narrator: It seems we're already seeing the signs
665
00:42:40,725 --> 00:42:44,160
of increased activity.
666
00:42:44,195 --> 00:42:46,296
George: Anybody who
spends time in the seas,
667
00:42:46,331 --> 00:42:48,998
in certain areas
have had a shark
668
00:42:49,034 --> 00:42:52,035
within 6 to 10 feet of them
at one time or another,
669
00:42:52,070 --> 00:42:53,870
without knowing it.
670
00:42:58,209 --> 00:43:01,778
Realistically, we're going
to see more shark bites
671
00:43:01,813 --> 00:43:04,147
from the bull shark
in years ahead,
672
00:43:04,182 --> 00:43:07,750
as long as we don't contain
the climate change.
673
00:43:11,323 --> 00:43:14,023
Narrator: Powerful...
674
00:43:14,059 --> 00:43:16,259
Stealthy...
675
00:43:16,294 --> 00:43:18,494
Adaptable...
676
00:43:18,530 --> 00:43:21,264
And aggressive...
677
00:43:21,299 --> 00:43:23,299
With a deadly bite.
678
00:43:26,705 --> 00:43:29,672
The bull shark swims where we do.
679
00:43:32,510 --> 00:43:34,677
If you get into the water,
680
00:43:34,713 --> 00:43:39,148
you do so at your own risk.
681
00:43:39,184 --> 00:43:40,583
(scream)
682
00:43:40,619 --> 00:43:43,286
george: The sea does
not belong to us.
683
00:43:43,321 --> 00:43:45,722
It's a wilderness experience.
684
00:43:45,757 --> 00:43:48,958
As you enter the sea,
you're an ecotourist.
685
00:43:48,994 --> 00:43:51,928
You need to understand
there's risk.
686
00:43:51,963 --> 00:43:54,130
Mike: If you see bull sharks
in the water,
687
00:43:54,165 --> 00:43:56,833
I would suggest getting out.
688
00:43:56,868 --> 00:43:58,434
I'm getting out!
689
00:44:01,606 --> 00:44:04,040
(muffled scream)
690
00:44:04,075 --> 00:44:05,975
captioned by
side door media services
59558
Can't find what you're looking for?
Get subtitles in any language from opensubtitles.com, and translate them here.