1
00:00:00,900 --> 00:00:04,604
♪ ♪

2
00:00:04,604 --> 00:00:09,375
The Arctic is a tough place
 to be a parent;

3
00:00:09,375 --> 00:00:13,079
even tougher when you have
 to lead your family

4
00:00:13,079 --> 00:00:17,417
on an epic journey
 just to survive.

5
00:00:17,417 --> 00:00:21,287
[wind howling]

6
00:00:21,287 --> 00:00:22,822
♪ ♪

7
00:00:22,822 --> 00:00:25,424
40 degrees below.

8
00:00:25,424 --> 00:00:27,293
[cub groans]

9
00:00:29,094 --> 00:00:33,466
All too tempting to stay in.

10
00:00:33,466 --> 00:00:36,369
♪ ♪

11
00:00:36,369 --> 00:00:42,508
♪ ♪

12
00:00:42,508 --> 00:00:47,414
Mom can't afford to get
 too cozy, though.

13
00:00:47,414 --> 00:00:49,948
[cub squeaks]

14
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After nursing for three months

15
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and losing two pounds of fat
 every day,

16
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she's starving.

17
00:01:02,061 --> 00:01:03,863
[groans]

18
00:01:03,863 --> 00:01:09,635
♪ ♪

19
00:01:09,635 --> 00:01:13,872
But breakfast is
 over 100 miles away,

20
00:01:13,872 --> 00:01:17,143
out on the Hudson Bay sea ice.

21
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[squeak]

22
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Leave too soon,

23
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and her puppy-size cubs
 will struggle to keep up.

24
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[squeak]

25
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But if she doesn't get to eat,
 none of them stand a chance.

26
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♪ ♪

27
00:01:42,568 --> 00:01:48,675
♪ ♪

28
00:01:48,675 --> 00:01:52,078
With the arrival
 of the spring sun,

29
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she makes her move.

30
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♪ ♪

31
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♪ ♪

32
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She leads them into a world
 of new sights...

33
00:02:08,727 --> 00:02:10,830
sounds...

34
00:02:10,830 --> 00:02:12,665
and scares.

35
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[squeak]

36
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♪ ♪

37
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One day they'll grow up to be

38
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the world's most powerful
 land predator.

39
00:02:26,713 --> 00:02:28,748
But not today.

40
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♪ ♪

41
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[grunts]

42
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♪ ♪

43
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As a single mom,

44
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her job is to keep them safe

45
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on the most dangerous journey
 of their lives.

46
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♪ ♪

47
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Approaching the coast,
 she's on high alert.

48
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[howl]

49
00:03:03,449 --> 00:03:07,186
♪ ♪

50
00:03:07,186 --> 00:03:10,122
This is wolf territory.

51
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♪ ♪

52
00:03:13,425 --> 00:03:17,629
Packs patrol the shores
 of Canada's Hudson Bay

53
00:03:17,629 --> 00:03:20,699
and could target
 polar bear cubs.

54
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♪ ♪

55
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Mom's incredible sense of smell
 helps her pick up their scent

56
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from over five miles away...

57
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♪ ♪

58
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...giving her cubs
 a crucial head start.

59
00:03:40,553 --> 00:03:44,457
[chuffing]

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♪ ♪

61
00:03:48,027 --> 00:03:49,862
[grunts]

62
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♪ ♪

63
00:03:56,869 --> 00:03:58,537
[cub cries]

64
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♪ ♪

65
00:04:01,106 --> 00:04:03,642
[cub crying]

66
00:04:03,642 --> 00:04:06,812
♪ ♪

67
00:04:06,812 --> 00:04:09,582
[cub crying]

68
00:04:09,582 --> 00:04:13,486
[chuffing]

69
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[whimpers]

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♪ ♪

71
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♪ ♪

72
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Her years of experience
 have helped them

73
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sneak through enemy lines.

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♪ ♪

75
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♪ ♪

76
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She's made it

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00:04:43,182 --> 00:04:44,984
to the frozen ocean.

78
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Ahead, a four-month journey

79
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out onto the sea ice.

80
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She sets a course northeast,

81
00:05:00,499 --> 00:05:03,503
cubs safely in tow...

82
00:05:05,638 --> 00:05:09,575
...to find her first meal
 in eight months.

83
00:05:09,575 --> 00:05:15,614
♪ ♪

84
00:05:15,614 --> 00:05:19,552
Nothing is easy
 here in the Arctic.

85
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♪ ♪

86
00:05:25,391 --> 00:05:31,931
Polar parents must make
 incredible journeys,

87
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teaching their young
 how to make it through,

88
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all racing to make the most

89
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of the short Arctic summer

90
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in a world that's changing
 faster than ever before.

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[barks]

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♪ ♪

93
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♪ ♪

94
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♪ ♪

95
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♪ ♪

96
00:06:12,071 --> 00:06:15,108
While some parents
 are just setting out,

97
00:06:15,108 --> 00:06:20,012
others are ending
 a long winter on the move.

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♪ ♪

99
00:06:22,648 --> 00:06:28,620
♪ ♪

100
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This male arctic fox has spent
 the last six months...

101
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alone.

102
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[sniffing]

103
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He really goes the distance

104
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when food is in short supply.

105
00:06:45,871 --> 00:06:49,542
One even clocked
 more than 1,000 miles

106
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in just over two months.

107
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♪ ♪

108
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This little guy
 has been surviving

109
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off his street smarts.

110
00:07:02,755 --> 00:07:03,656
[squawk]

111
00:07:07,660 --> 00:07:12,965
You can't be too careful when
 you're only 12 inches tall.

112
00:07:12,965 --> 00:07:15,368
[seagulls squawking]

113
00:07:15,368 --> 00:07:20,806
[seagulls squawking]

114
00:07:20,806 --> 00:07:26,378
In the Arctic, even leftovers
 are a reason to celebrate.

115
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♪ ♪

116
00:07:32,184 --> 00:07:38,557
♪ ♪

117
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With spring in the air,

118
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he's heading home to reunite
 with his lifelong mate.

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♪ ♪

120
00:07:49,034 --> 00:07:55,107
♪ ♪

121
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They've spent the long winter
 apart, searching for food.

122
00:08:00,245 --> 00:08:05,283
♪ ♪

123
00:08:05,283 --> 00:08:10,089
He must find her if there's
 any hope of starting a family.

124
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♪ ♪

125
00:08:13,959 --> 00:08:19,965
♪ ♪

126
00:08:19,965 --> 00:08:24,269
Maybe she hasn't
 survived the winter.

127
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♪ ♪

128
00:08:31,243 --> 00:08:38,250
♪ ♪

129
00:08:38,250 --> 00:08:40,352
Ah, there she is.

130
00:08:40,352 --> 00:08:42,054
[squeak]

131
00:08:42,054 --> 00:08:45,591
♪ ♪

132
00:08:45,591 --> 00:08:47,560
Together again.

133
00:08:47,560 --> 00:08:50,196
[yipping]

134
00:08:50,196 --> 00:08:55,767
[yipping]

135
00:08:55,767 --> 00:08:57,903
Time to get on
 with the business

136
00:08:57,903 --> 00:09:00,672
of becoming a mom and dad

137
00:09:00,672 --> 00:09:02,908
and to raise
 their litter of pups

138
00:09:02,908 --> 00:09:05,210
before the end of summer.

139
00:09:05,210 --> 00:09:08,180
♪ ♪

140
00:09:08,180 --> 00:09:14,787
♪ ♪

141
00:09:17,856 --> 00:09:22,194
The top of the world
at the end of winter.

142
00:09:22,194 --> 00:09:27,332
♪ ♪

143
00:09:27,332 --> 00:09:29,702
[snort]

144
00:09:29,702 --> 00:09:33,972
In Alaska's extreme north,
 a three-year-old caribou

145
00:09:33,972 --> 00:09:38,510
is starting her own journey
 to become a parent.

146
00:09:38,510 --> 00:09:40,312
[snort]

147
00:09:40,312 --> 00:09:42,181
Five months pregnant,

148
00:09:42,181 --> 00:09:46,885
she's scraping by on a diet
 of frozen lichen.

149
00:09:46,885 --> 00:09:50,890
♪ ♪

150
00:09:50,890 --> 00:09:54,927
Life as a caribou
 is never lonely.

151
00:09:54,927 --> 00:09:58,964
♪ ♪

152
00:09:58,964 --> 00:10:04,536
She's one
 of a 100,000-strong herd,

153
00:10:04,536 --> 00:10:09,608
sticking close together
 for good reason.

154
00:10:09,608 --> 00:10:12,578
♪ ♪

155
00:10:12,578 --> 00:10:17,482
♪ ♪

156
00:10:17,482 --> 00:10:20,820
[howl]

157
00:10:20,820 --> 00:10:24,390
She has her own wolves
 to contend with.

158
00:10:24,390 --> 00:10:29,094
[howling]

159
00:10:29,094 --> 00:10:33,165
The pack has had a long,
 tough winter as well,

160
00:10:33,165 --> 00:10:34,700
and they're hungry.

161
00:10:35,868 --> 00:10:41,707
♪ ♪

162
00:10:41,707 --> 00:10:44,476
To avoid becoming
 their next meal,

163
00:10:44,476 --> 00:10:47,112
she must stay vigilant.

164
00:10:47,112 --> 00:10:53,518
♪ ♪

165
00:10:53,518 --> 00:10:56,154
♪ ♪

166
00:10:56,154 --> 00:11:01,693
♪ ♪

167
00:11:01,693 --> 00:11:03,128
She sounds the alarm.

168
00:11:03,128 --> 00:11:04,830
[bark]

169
00:11:04,830 --> 00:11:09,935
[caribou grunting]

170
00:11:09,935 --> 00:11:16,208
♪ ♪

171
00:11:16,208 --> 00:11:21,179
Heavily pregnant, she can't
 risk getting left behind.

172
00:11:21,179 --> 00:11:23,615
♪ ♪

173
00:11:23,615 --> 00:11:28,854
♪ ♪

174
00:11:28,854 --> 00:11:33,358
The wolves' strategy is
 to run them into the ground.

175
00:11:33,358 --> 00:11:35,961
♪ ♪

176
00:11:35,961 --> 00:11:40,432
♪ ♪

177
00:11:40,432 --> 00:11:44,036
[caribou grunting]

178
00:11:44,036 --> 00:11:48,274
♪ ♪

179
00:11:48,274 --> 00:11:51,309
Those that stumble

180
00:11:51,309 --> 00:11:53,445
won't last long.

181
00:11:53,445 --> 00:11:56,181
♪ ♪

182
00:11:56,181 --> 00:11:57,850
[bark]

183
00:11:57,850 --> 00:12:00,352
[birds cawing]

184
00:12:04,956 --> 00:12:10,662
One caribou can keep
 the pack fed for days.

185
00:12:10,662 --> 00:12:13,298
♪ ♪

186
00:12:13,298 --> 00:12:19,438
♪ ♪

187
00:12:19,438 --> 00:12:22,474
[grunting]

188
00:12:22,474 --> 00:12:25,578
Safely tucked within the herd,

189
00:12:25,578 --> 00:12:29,581
she sets off
 on a 300-mile trek...

190
00:12:29,581 --> 00:12:34,753
♪ ♪

191
00:12:34,753 --> 00:12:37,622
...scaling the mighty
Brooks Range.

192
00:12:37,622 --> 00:12:40,258
♪ ♪

193
00:12:40,258 --> 00:12:45,764
♪ ♪

194
00:12:45,764 --> 00:12:48,500
At 9,000 feet,

195
00:12:48,500 --> 00:12:51,203
the Arctic's highest mountains.

196
00:12:51,203 --> 00:12:54,206
♪ ♪

197
00:12:54,206 --> 00:12:58,110
She needs to make it to the
 rich grasslands of the north...

198
00:12:58,110 --> 00:13:01,614
♪ ♪

199
00:13:01,614 --> 00:13:06,051
...where she can raise
 her unborn calf.

200
00:13:06,051 --> 00:13:07,419
[grunt]

201
00:13:16,328 --> 00:13:21,299
The polar bear mom already has
 two hungry mouths to feed.

202
00:13:21,299 --> 00:13:25,070
♪ ♪

203
00:13:25,070 --> 00:13:29,141
The next four months
 are make or break.

204
00:13:29,141 --> 00:13:35,280
♪ ♪

205
00:13:35,280 --> 00:13:38,150
If she doesn't find
 enough to eat,

206
00:13:38,150 --> 00:13:41,319
her cubs might not see
 their first birthday.

207
00:13:41,319 --> 00:13:46,058
♪ ♪

208
00:13:46,058 --> 00:13:50,229
But this ice bear
 is in her element.

209
00:13:52,063 --> 00:13:54,132
Over the spring and summer,

210
00:13:54,132 --> 00:13:59,037
she'll lead her cubs
 nearly 2,000 miles

211
00:13:59,037 --> 00:14:02,040
across the frozen Hudson Bay

212
00:14:02,040 --> 00:14:05,677
to find the food
 that they need to survive.

213
00:14:05,677 --> 00:14:11,817
♪ ♪

214
00:14:11,817 --> 00:14:15,988
Sea ice forms
 the perfect hunting ground.

215
00:14:19,057 --> 00:14:23,395
She can smell a seal
 from 20 miles away.

216
00:14:23,395 --> 00:14:29,167
♪ ♪

217
00:14:29,167 --> 00:14:31,236
[thud]

218
00:14:31,236 --> 00:14:33,672
♪ ♪

219
00:14:33,672 --> 00:14:39,778
♪ ♪

220
00:14:39,778 --> 00:14:43,548
Success relies on patience...

221
00:14:43,548 --> 00:14:46,050
♪ ♪

222
00:14:46,050 --> 00:14:49,588
...and explosive speed.

223
00:14:51,323 --> 00:14:53,158
[seal yelps]

224
00:14:57,262 --> 00:14:59,698
♪ ♪

225
00:14:59,698 --> 00:15:01,433
[cub roars]

226
00:15:02,835 --> 00:15:05,470
Hunting season is short.

227
00:15:05,470 --> 00:15:08,908
♪ ♪

228
00:15:08,908 --> 00:15:11,944
If she's to get her cubs
 through the summer,

229
00:15:11,944 --> 00:15:16,348
mom must catch
 every seal she can.

230
00:15:16,348 --> 00:15:18,783
♪ ♪

231
00:15:18,783 --> 00:15:25,724
♪ ♪

232
00:15:25,724 --> 00:15:27,459
[chime]

233
00:15:27,459 --> 00:15:30,328
♪ ♪

234
00:15:30,328 --> 00:15:31,563
[chime]

235
00:15:31,563 --> 00:15:34,800
Long days and gentle warmth

236
00:15:34,800 --> 00:15:37,235
melt the ice and snow...

237
00:15:37,235 --> 00:15:41,673
♪ ♪

238
00:15:41,673 --> 00:15:45,544
...transforming the remote
Arctic islands of Svalbard.

239
00:15:47,545 --> 00:15:49,981
[birds chattering]

240
00:15:49,981 --> 00:15:56,421
[birds chattering]

241
00:15:56,421 --> 00:15:58,356
♪ ♪

242
00:15:58,356 --> 00:16:02,961
The fox couple swap
 their warm winter whites...

243
00:16:02,961 --> 00:16:04,029
[screech]

244
00:16:04,029 --> 00:16:06,498
...for cool summer coats.

245
00:16:06,498 --> 00:16:10,970
♪ ♪

246
00:16:10,970 --> 00:16:14,939
And they have five
 hungry new mouths to feed.

247
00:16:14,939 --> 00:16:17,575
[shrieking]

248
00:16:17,575 --> 00:16:24,483
[shrieking]

249
00:16:25,550 --> 00:16:32,391
Male arctic foxes make
 the most devoted dads,

250
00:16:32,391 --> 00:16:36,762
working tirelessly
 to put food on the table.

251
00:16:38,764 --> 00:16:41,799
[chirping]

252
00:16:41,799 --> 00:16:43,068
The millions of little auks

253
00:16:43,068 --> 00:16:46,038
that have crossed
 the Arctic Ocean to be here

254
00:16:46,038 --> 00:16:49,074
could feed his family
 for months,

255
00:16:49,074 --> 00:16:53,578
if he can catch them
nesting among the boulders.

256
00:16:53,578 --> 00:16:59,017
[birds chattering]

257
00:16:59,017 --> 00:17:04,890
[birds chattering]

258
00:17:04,890 --> 00:17:08,626
[sniffing]

259
00:17:08,626 --> 00:17:12,497
[chattering]

260
00:17:12,497 --> 00:17:14,365
[wings fluttering]

261
00:17:14,365 --> 00:17:18,103
He's always one step behind.

262
00:17:18,103 --> 00:17:20,739
[sniffing]

263
00:17:20,739 --> 00:17:22,941
[chattering]

264
00:17:22,941 --> 00:17:25,844
[wings fluttering]

265
00:17:25,844 --> 00:17:28,480
They're giving him
 the runaround.

266
00:17:28,480 --> 00:17:30,882
[chattering]

267
00:17:30,882 --> 00:17:32,884
♪ ♪

268
00:17:32,884 --> 00:17:34,853
[chattering]

269
00:17:34,853 --> 00:17:38,290
♪ ♪

270
00:17:38,290 --> 00:17:40,925
He just can't get
 his paws on them.

271
00:17:40,925 --> 00:17:43,729
[chattering]

272
00:17:45,898 --> 00:17:48,132
To feed his pups,

273
00:17:48,132 --> 00:17:51,970
he needs to work smarter,
 not harder.

274
00:17:51,970 --> 00:17:58,610
♪ ♪

275
00:17:58,610 --> 00:18:00,412
[chattering]

276
00:18:00,412 --> 00:18:03,848
♪ ♪

277
00:18:03,848 --> 00:18:10,455
♪ ♪

278
00:18:10,455 --> 00:18:17,028
♪ ♪

279
00:18:17,028 --> 00:18:19,164
A good start.

280
00:18:22,534 --> 00:18:27,739
Still not enough
 for a growing family

281
00:18:27,739 --> 00:18:31,210
who needs to fatten up
 over the short summer months.

282
00:18:41,353 --> 00:18:44,556
Seasons change fast
 in the Arctic.

283
00:18:44,556 --> 00:18:47,592
♪ ♪

284
00:18:47,592 --> 00:18:53,031
♪ ♪

285
00:18:53,031 --> 00:18:59,838
♪ ♪

286
00:18:59,838 --> 00:19:04,142
The caribou mom-to-be
 is running with her herd...

287
00:19:04,142 --> 00:19:06,744
[chattering]

288
00:19:06,744 --> 00:19:09,715
[caribou grunting]

289
00:19:11,449 --> 00:19:15,120
...following ancient pathways

290
00:19:15,120 --> 00:19:18,923
as they have
 for over 50,000 years.

291
00:19:18,923 --> 00:19:22,494
♪ ♪

292
00:19:22,494 --> 00:19:27,599
Along with half a million other
 females across North America,

293
00:19:27,599 --> 00:19:31,269
she's nearing her
 ancestral calving grounds

294
00:19:31,269 --> 00:19:34,506
300 miles to the north.

295
00:19:34,506 --> 00:19:39,477
♪ ♪

296
00:19:39,477 --> 00:19:42,848
Reaching grasslands
 packed with superfoods...

297
00:19:45,717 --> 00:19:48,920
...just when she
 needs them most.

298
00:19:48,920 --> 00:19:51,556
♪ ♪

299
00:19:51,556 --> 00:19:56,928
♪ ♪

300
00:19:56,928 --> 00:20:00,566
She's eating for two.

301
00:20:03,634 --> 00:20:08,507
Her newborn calf,
 just days old.

302
00:20:10,975 --> 00:20:12,210
[grunt]

303
00:20:12,210 --> 00:20:15,947
She's totally dependent
 on her mom.

304
00:20:15,947 --> 00:20:17,782
[grunt]

305
00:20:17,782 --> 00:20:21,219
♪ ♪

306
00:20:21,219 --> 00:20:27,392
♪ ♪

307
00:20:27,392 --> 00:20:31,696
Soon, she'll need to lead
 this little one

308
00:20:31,696 --> 00:20:35,367
across thousands of miles
 of tundra.

309
00:20:38,870 --> 00:20:40,171
But first...

310
00:20:40,171 --> 00:20:44,443
♪ ♪

311
00:20:44,443 --> 00:20:49,080
...her calf has to find
 her snow legs.

312
00:20:49,080 --> 00:20:51,716
♪ ♪

313
00:20:51,716 --> 00:20:58,223
♪ ♪

314
00:20:58,223 --> 00:21:05,197
♪ ♪

315
00:21:05,197 --> 00:21:07,866
And just in time.

316
00:21:07,866 --> 00:21:13,204
♪ ♪

317
00:21:13,204 --> 00:21:16,541
Trouble's brewing
 beneath their feet.

318
00:21:16,541 --> 00:21:22,280
♪ ♪

319
00:21:22,280 --> 00:21:25,383
Mosquitoes that
 spend the winter

320
00:21:25,383 --> 00:21:29,020
in a state of suspended
 animation under the snow

321
00:21:29,020 --> 00:21:30,922
are emerging.

322
00:21:34,326 --> 00:21:40,431
[buzzing]

323
00:21:40,431 --> 00:21:42,700
As the planet warms,

324
00:21:42,700 --> 00:21:47,839
an earlier spring
 supercharges the swarm.

325
00:21:47,839 --> 00:21:52,610
[buzzing]

326
00:21:52,610 --> 00:21:57,882
Caribou can lose half a pint
of blood in a day.

327
00:21:57,882 --> 00:22:03,655
♪ ♪

328
00:22:03,655 --> 00:22:08,360
One in four calves die
 during this first month.

329
00:22:08,360 --> 00:22:12,664
[buzzing]

330
00:22:12,664 --> 00:22:16,467
But mom's been here before

331
00:22:16,467 --> 00:22:19,170
and knows a way out.

332
00:22:19,170 --> 00:22:25,877
♪ ♪

333
00:22:25,877 --> 00:22:29,614
[calf grunting]

334
00:22:31,115 --> 00:22:33,751
They join a mass exodus...

335
00:22:33,751 --> 00:22:36,454
♪ ♪

336
00:22:36,454 --> 00:22:40,425
...to the mountains,

337
00:22:40,425 --> 00:22:44,596
where cool winds keep
 biting insects at bay.

338
00:22:44,596 --> 00:22:47,031
♪ ♪

339
00:22:47,031 --> 00:22:51,502
♪ ♪

340
00:22:51,502 --> 00:22:54,873
But up here, food is scarce.

341
00:22:56,207 --> 00:22:58,777
They can't stay for long.

342
00:23:11,222 --> 00:23:13,357
For every Arctic parent,

343
00:23:13,357 --> 00:23:17,262
the quest for food
 can mean life or death.

344
00:23:17,262 --> 00:23:20,932
[sniffing]

345
00:23:20,932 --> 00:23:24,903
♪ ♪

346
00:23:24,903 --> 00:23:28,973
Only one of the polar bear's
 cubs has made it.

347
00:23:28,973 --> 00:23:35,012
♪ ♪

348
00:23:35,012 --> 00:23:40,718
The other, most likely
 lost to starvation.

349
00:23:40,718 --> 00:23:46,157
♪ ♪

350
00:23:46,157 --> 00:23:51,262
♪ ♪

351
00:23:51,262 --> 00:23:57,235
Even the most dedicated parent
 sometimes struggles to provide.

352
00:23:57,235 --> 00:24:01,740
♪ ♪

353
00:24:01,740 --> 00:24:05,009
Mom can't afford
 to lose them both.

354
00:24:05,009 --> 00:24:08,379
♪ ♪

355
00:24:08,379 --> 00:24:10,181
[squeak]

356
00:24:10,181 --> 00:24:16,020
♪ ♪

357
00:24:16,020 --> 00:24:19,924
But her world is
 melting around her.

358
00:24:19,924 --> 00:24:22,360
♪ ♪

359
00:24:22,360 --> 00:24:29,000
♪ ♪

360
00:24:29,000 --> 00:24:35,306
♪ ♪

361
00:24:35,306 --> 00:24:41,145
As a last resort, she tries
 to hunt from the water.

362
00:24:41,145 --> 00:24:45,283
♪ ♪

363
00:24:45,283 --> 00:24:52,290
♪ ♪

364
00:24:52,290 --> 00:24:59,297
♪ ♪

365
00:24:59,297 --> 00:25:06,304
♪ ♪

366
00:25:06,304 --> 00:25:13,311
♪ ♪

367
00:25:13,311 --> 00:25:15,146
[snort]

368
00:25:15,146 --> 00:25:17,782
♪ ♪

369
00:25:17,782 --> 00:25:22,320
♪ ♪

370
00:25:22,320 --> 00:25:23,855
[roar]

371
00:25:31,429 --> 00:25:35,399
Just one in 10 hunts
 is successful.

372
00:25:35,399 --> 00:25:40,305
♪ ♪

373
00:25:40,305 --> 00:25:43,441
And it's only getting harder.

374
00:25:43,441 --> 00:25:49,147
♪ ♪

375
00:25:49,147 --> 00:25:51,315
With the Arctic warming
 twice as fast

376
00:25:51,315 --> 00:25:54,286
as the rest of the planet,

377
00:25:54,286 --> 00:25:59,890
Hudson Bay is melting earlier
 year on year,

378
00:25:59,890 --> 00:26:04,562
shortening her hunting season
 by up to a month.

379
00:26:04,562 --> 00:26:06,164
♪ ♪

380
00:26:06,164 --> 00:26:12,971
♪ ♪

381
00:26:12,971 --> 00:26:17,208
It's time to cut their losses

382
00:26:17,208 --> 00:26:19,343
and head back to land.

383
00:26:19,343 --> 00:26:21,479
[cub cries]

384
00:26:21,479 --> 00:26:26,751
♪ ♪

385
00:26:26,751 --> 00:26:31,055
They walked here,

386
00:26:31,055 --> 00:26:36,594
but a 100-mile swim for her cub
 is out of the question.

387
00:26:36,594 --> 00:26:39,096
♪ ♪

388
00:26:39,096 --> 00:26:45,069
♪ ♪

389
00:26:45,069 --> 00:26:51,008
So, mom hitches a ride
 on her very own life raft.

390
00:26:51,008 --> 00:26:56,480
♪ ♪

391
00:26:56,480 --> 00:26:59,717
By sensing the movement
 of the ice,

392
00:26:59,717 --> 00:27:04,055
she knows she's heading
 back to shore.

393
00:27:04,055 --> 00:27:06,490
♪ ♪

394
00:27:06,490 --> 00:27:13,197
♪ ♪

395
00:27:13,197 --> 00:27:15,233
[cub groans]

396
00:27:17,034 --> 00:27:20,037
♪ ♪

397
00:27:20,037 --> 00:27:25,109
A chance to lie back and let
 the current do the work.

398
00:27:25,109 --> 00:27:27,545
♪ ♪

399
00:27:27,545 --> 00:27:32,416
♪ ♪

400
00:27:32,416 --> 00:27:33,952
[cub groans]

401
00:27:37,421 --> 00:27:41,793
[birds squawking]

402
00:27:41,793 --> 00:27:43,862
For some Arctic parents,

403
00:27:43,862 --> 00:27:48,166
the summer melt is
 the start of leaner times.

404
00:27:50,001 --> 00:27:51,269
[bark]

405
00:27:51,269 --> 00:27:56,974
But for others, it brings
 all the food they can eat.

406
00:27:56,974 --> 00:27:58,376
[bark]

407
00:27:59,944 --> 00:28:03,981
The arctic fox dad has
 his pups to look out for.

408
00:28:03,981 --> 00:28:10,388
♪ ♪

409
00:28:10,388 --> 00:28:13,157
It's why he made his journey
 to raise them

410
00:28:13,157 --> 00:28:19,063
in exactly the right place
 at exactly the right time.

411
00:28:19,063 --> 00:28:22,500
♪ ♪

412
00:28:22,500 --> 00:28:28,740
♪ ♪

413
00:28:28,740 --> 00:28:32,711
High above on the dizzying
 sea cliffs...

414
00:28:34,712 --> 00:28:38,148
...murre chicks
 are ready to fledge

415
00:28:38,148 --> 00:28:42,653
and about to start
 their own migration.

416
00:28:42,653 --> 00:28:44,556
[chirping]

417
00:28:44,556 --> 00:28:49,360
But at just three weeks old,
 they still can't fly.

418
00:28:49,360 --> 00:28:53,497
[chirping]

419
00:28:53,497 --> 00:28:55,800
Over 1,000 feet up,

420
00:28:55,800 --> 00:29:00,938
there's only one way down
 to the ocean below,

421
00:29:00,938 --> 00:29:04,476
nearly half a mile away.

422
00:29:07,878 --> 00:29:12,183
Their parents believe
 in tough love.

423
00:29:15,119 --> 00:29:19,757
Time for a little
 gentle encouragement.

424
00:29:19,757 --> 00:29:24,395
♪ ♪

425
00:29:24,395 --> 00:29:31,135
♪ ♪

426
00:29:31,135 --> 00:29:38,142
♪ ♪

427
00:29:38,142 --> 00:29:42,147
[squawking]

428
00:29:44,749 --> 00:29:45,750
Out of reach.

429
00:29:45,750 --> 00:29:47,618
[chirping]

430
00:29:47,618 --> 00:29:51,021
But over a few short days,

431
00:29:51,021 --> 00:29:54,659
thousands of first-time
 skydivers make the leap.

432
00:29:54,659 --> 00:29:57,896
[chirping]

433
00:30:00,264 --> 00:30:01,799
Some...

434
00:30:01,799 --> 00:30:04,169
[chirping]

435
00:30:04,169 --> 00:30:06,370
...fall short.

436
00:30:06,370 --> 00:30:09,673
[chirping]

437
00:30:09,673 --> 00:30:12,576
This is dad's big chance.

438
00:30:12,576 --> 00:30:16,146
♪ ♪

439
00:30:16,146 --> 00:30:18,916
But with so many
 to choose from,

440
00:30:18,916 --> 00:30:21,685
he doesn't know
 which way to turn.

441
00:30:21,685 --> 00:30:24,321
♪ ♪

442
00:30:24,321 --> 00:30:29,727
♪ ♪

443
00:30:29,727 --> 00:30:36,233
♪ ♪

444
00:30:36,233 --> 00:30:38,636
They're faster than they look.

445
00:30:38,636 --> 00:30:41,272
♪ ♪

446
00:30:41,272 --> 00:30:46,143
♪ ♪

447
00:30:46,143 --> 00:30:49,080
His pups are relying on him;

448
00:30:49,080 --> 00:30:51,382
the pressure is on.

449
00:30:51,382 --> 00:30:55,352
♪ ♪

450
00:30:55,352 --> 00:31:02,193
♪ ♪

451
00:31:02,193 --> 00:31:03,761
[growling]

452
00:31:03,761 --> 00:31:07,365
[chirping]

453
00:31:07,365 --> 00:31:08,799
Got one.

454
00:31:08,799 --> 00:31:13,337
♪ ♪

455
00:31:13,337 --> 00:31:18,643
He'll need to catch
 bird after bird while he can

456
00:31:18,643 --> 00:31:20,478
to feed his hungry pups.

457
00:31:23,247 --> 00:31:28,853
[chirping]

458
00:31:28,853 --> 00:31:33,624
♪ ♪

459
00:31:33,624 --> 00:31:34,892
[sniffing]

460
00:31:34,892 --> 00:31:38,162
Finally, he's on a roll.

461
00:31:46,237 --> 00:31:49,407
[chirping]

462
00:31:49,407 --> 00:31:52,042
High above,

463
00:31:52,042 --> 00:31:54,445
one of the last to go.

464
00:31:54,445 --> 00:31:56,881
♪ ♪

465
00:31:56,881 --> 00:32:01,886
♪ ♪

466
00:32:01,886 --> 00:32:04,688
[chirping]

467
00:32:04,688 --> 00:32:11,194
♪ ♪

468
00:32:11,194 --> 00:32:13,931
But dad's right behind him.

469
00:32:13,931 --> 00:32:16,567
♪ ♪

470
00:32:16,567 --> 00:32:22,706
♪ ♪

471
00:32:22,706 --> 00:32:24,909
Even helping out a bit.

472
00:32:24,909 --> 00:32:27,545
♪ ♪

473
00:32:27,545 --> 00:32:33,184
♪ ♪

474
00:32:33,184 --> 00:32:39,057
♪ ♪

475
00:32:39,057 --> 00:32:44,228
Wings found, now he's got
 to stay on course.

476
00:32:44,228 --> 00:32:46,664
♪ ♪

477
00:32:46,664 --> 00:32:52,303
♪ ♪

478
00:32:52,303 --> 00:32:58,642
♪ ♪

479
00:32:58,642 --> 00:33:00,311
[squawk]

480
00:33:00,311 --> 00:33:07,451
♪ ♪

481
00:33:07,451 --> 00:33:10,721
[chirping]

482
00:33:10,721 --> 00:33:17,628
He's starting a 2,000-mile
 Arctic voyage of his own.

483
00:33:17,628 --> 00:33:20,598
[chirping]

484
00:33:20,598 --> 00:33:24,301
There's always one
 that gets away.

485
00:33:24,301 --> 00:33:28,672
♪ ♪

486
00:33:28,672 --> 00:33:31,442
Every Arctic parent has to do
 whatever it takes

487
00:33:31,442 --> 00:33:33,378
to raise the next generation.

488
00:33:37,281 --> 00:33:40,951
The fox dad making sure
 his pups have enough food

489
00:33:40,951 --> 00:33:44,455
to prepare them
 for their life ahead.

490
00:33:46,524 --> 00:33:49,127
[gentle snoring]

491
00:33:52,696 --> 00:33:59,170
♪ ♪

492
00:33:59,170 --> 00:34:02,172
At the height of summer,

493
00:34:02,172 --> 00:34:04,975
the caribou mom is
 finally within reach

494
00:34:04,975 --> 00:34:09,847
of the rich pastures she needs
 to secure her calf's future.

495
00:34:09,847 --> 00:34:12,483
♪ ♪

496
00:34:12,483 --> 00:34:18,823
♪ ♪

497
00:34:18,823 --> 00:34:22,859
But in her way,

498
00:34:22,859 --> 00:34:25,363
in the valleys below,

499
00:34:25,363 --> 00:34:28,966
rivers swelling
 with meltwater.

500
00:34:28,966 --> 00:34:33,437
[grunting]

501
00:34:33,437 --> 00:34:37,708
It's a danger they've not yet
had to face together.

502
00:34:43,047 --> 00:34:48,652
♪ ♪

503
00:34:48,652 --> 00:34:54,692
♪ ♪

504
00:34:54,692 --> 00:35:00,097
Mom knows it's best
 to stick with the herd,

505
00:35:00,097 --> 00:35:03,767
seeking shelter
 from the current.

506
00:35:03,767 --> 00:35:09,273
♪ ♪

507
00:35:09,273 --> 00:35:13,444
But it's her calf's first time
 in deep water.

508
00:35:13,444 --> 00:35:15,879
♪ ♪

509
00:35:15,879 --> 00:35:21,985
♪ ♪

510
00:35:21,985 --> 00:35:25,756
And this river is powerful.

511
00:35:25,756 --> 00:35:32,363
♪ ♪

512
00:35:32,363 --> 00:35:39,136
♪ ♪

513
00:35:39,136 --> 00:35:42,440
♪ ♪

514
00:35:46,143 --> 00:35:50,514
[grunting]

515
00:35:50,514 --> 00:35:55,853
♪ ♪

516
00:35:55,853 --> 00:36:01,525
It's a parent's worst nightmare
 to lose sight of their child.

517
00:36:01,525 --> 00:36:05,963
♪ ♪

518
00:36:05,963 --> 00:36:11,736
♪ ♪

519
00:36:11,736 --> 00:36:13,737
[calf bleating]

520
00:36:13,737 --> 00:36:15,572
♪ ♪

521
00:36:15,572 --> 00:36:21,812
♪ ♪

522
00:36:21,812 --> 00:36:28,151
♪ ♪

523
00:36:28,151 --> 00:36:29,754
Dry land.

524
00:36:29,754 --> 00:36:35,526
[calf bleating]

525
00:36:35,526 --> 00:36:39,329
♪ ♪

526
00:36:39,329 --> 00:36:42,666
But they're still
 only halfway across.

527
00:36:42,666 --> 00:36:47,071
♪ ♪

528
00:36:47,071 --> 00:36:48,772
[calf bleats]

529
00:36:48,772 --> 00:36:51,208
♪ ♪

530
00:36:51,208 --> 00:36:56,413
♪ ♪

531
00:36:56,413 --> 00:36:59,684
This time, mom sticks close

532
00:36:59,684 --> 00:37:03,554
to try and shield her exhausted
calf from the current.

533
00:37:03,554 --> 00:37:05,989
♪ ♪

534
00:37:05,989 --> 00:37:12,029
♪ ♪

535
00:37:12,029 --> 00:37:17,701
[calf bleating]

536
00:37:17,701 --> 00:37:19,737
[splash]

537
00:37:19,737 --> 00:37:23,174
[mom grunting]

538
00:37:23,174 --> 00:37:30,815
[calf bleating]

539
00:37:30,815 --> 00:37:32,916
[mom grunting]

540
00:37:32,916 --> 00:37:37,621
♪ ♪

541
00:37:37,621 --> 00:37:44,394
♪ ♪

542
00:37:44,394 --> 00:37:49,300
Mom is powerless to help.

543
00:37:49,300 --> 00:37:52,236
But they've come
 this far together.

544
00:37:52,236 --> 00:37:54,872
She won't give up
 on her calf now.

545
00:37:54,872 --> 00:37:59,209
[bleating, grunting]

546
00:37:59,209 --> 00:38:05,949
♪ ♪

547
00:38:05,949 --> 00:38:12,956
♪ ♪

548
00:38:12,956 --> 00:38:19,964
♪ ♪

549
00:38:19,964 --> 00:38:24,601
[bleating]

550
00:38:24,601 --> 00:38:31,008
♪ ♪

551
00:38:31,008 --> 00:38:35,146
Time to pick up the pace

552
00:38:35,146 --> 00:38:38,315
and rejoin the safety
 of the herd.

553
00:38:38,315 --> 00:38:45,322
♪ ♪

554
00:38:45,322 --> 00:38:52,329
♪ ♪

555
00:38:52,329 --> 00:38:55,966
There's enough food here
 to sustain them

556
00:38:55,966 --> 00:38:58,101
until the beginning of winter.

557
00:38:58,101 --> 00:39:03,908
♪ ♪

558
00:39:03,908 --> 00:39:08,746
This caribou mom
 has done her job,

559
00:39:08,746 --> 00:39:12,349
teaching her calf
 how to make a journey

560
00:39:12,349 --> 00:39:15,619
that will now become
 her way of life.

561
00:39:15,619 --> 00:39:19,256
♪ ♪

562
00:39:19,256 --> 00:39:22,927
♪ ♪

563
00:39:27,064 --> 00:39:31,234
♪ ♪

564
00:39:31,234 --> 00:39:36,907
♪ ♪

565
00:39:36,907 --> 00:39:42,980
The polar bear mom is also
 nearing the end of her journey.

566
00:39:42,980 --> 00:39:47,017
She's so close,
 she can smell the land.

567
00:39:47,017 --> 00:39:50,621
♪ ♪

568
00:39:50,621 --> 00:39:57,127
♪ ♪

569
00:39:57,127 --> 00:40:04,134
♪ ♪

570
00:40:04,134 --> 00:40:06,904
Just one more short swim...

571
00:40:09,172 --> 00:40:11,742
...through dangerous waters.

572
00:40:11,742 --> 00:40:16,746
♪ ♪

573
00:40:16,746 --> 00:40:18,682
Heavyweight males have already

574
00:40:18,682 --> 00:40:21,218
been forced
 off the melting ice.

575
00:40:21,218 --> 00:40:24,354
♪ ♪

576
00:40:24,354 --> 00:40:30,727
♪ ♪

577
00:40:30,727 --> 00:40:36,066
They're on the lookout
 for an easy meal,

578
00:40:36,066 --> 00:40:38,101
like a bear cub.

579
00:40:38,101 --> 00:40:41,138
♪ ♪

580
00:40:41,138 --> 00:40:45,776
♪ ♪

581
00:40:45,776 --> 00:40:52,683
♪ ♪

582
00:40:57,655 --> 00:41:02,159
Luckily, there's something
 more substantial on the menu.

583
00:41:06,430 --> 00:41:09,266
Beluga whales.

584
00:41:09,266 --> 00:41:10,668
[blows air]

585
00:41:12,336 --> 00:41:14,104
[blowing]

586
00:41:14,104 --> 00:41:17,841
Every year thousands
come to this bay

587
00:41:17,841 --> 00:41:22,279
to give birth, feed,
 and socialize.

588
00:41:22,279 --> 00:41:26,550
♪ ♪

589
00:41:26,550 --> 00:41:27,951
[blowing]

590
00:41:27,951 --> 00:41:32,589
These ingenious bears have
 learned a new hunting technique

591
00:41:32,589 --> 00:41:35,626
to make the most
 of this opportunity.

592
00:41:37,394 --> 00:41:40,030
Waiting on giant rocks...

593
00:41:40,030 --> 00:41:43,533
♪ ♪

594
00:41:43,533 --> 00:41:45,970
...to launch their ambush.

595
00:41:52,543 --> 00:41:56,546
[grunting]

596
00:41:56,546 --> 00:41:59,182
It keeps them distracted...

597
00:41:59,182 --> 00:42:02,519
♪ ♪

598
00:42:02,519 --> 00:42:07,090
...allowing mom and cub
 to make it to shore.

599
00:42:07,090 --> 00:42:09,793
♪ ♪

600
00:42:09,793 --> 00:42:16,299
♪ ♪

601
00:42:16,299 --> 00:42:22,739
Her first instinct is to head
 for the safety of home,

602
00:42:22,739 --> 00:42:26,409
back to where it all began.

603
00:42:26,409 --> 00:42:30,313
♪ ♪

604
00:42:30,313 --> 00:42:34,952
But the smell of a fresh kill
 is too much to resist.

605
00:42:34,952 --> 00:42:37,721
[roaring]

606
00:42:40,891 --> 00:42:43,827
It forces her
to make a tough call...

607
00:42:43,827 --> 00:42:46,897
♪ ♪

608
00:42:46,897 --> 00:42:50,000
...and head into danger.

609
00:42:50,000 --> 00:42:51,402
[roar]

610
00:42:51,402 --> 00:42:56,973
[seagulls squawking]

611
00:42:56,973 --> 00:43:03,313
♪ ♪

612
00:43:03,313 --> 00:43:08,218
[roaring]

613
00:43:08,218 --> 00:43:10,854
[grunting]

614
00:43:10,854 --> 00:43:14,691
♪ ♪

615
00:43:14,691 --> 00:43:16,927
She stands her ground...

616
00:43:16,927 --> 00:43:20,163
[roaring]

617
00:43:20,163 --> 00:43:26,570
♪ ♪

618
00:43:26,570 --> 00:43:29,072
[roar]

619
00:43:29,072 --> 00:43:33,577
...and steals what could be
 their last meal in months.

620
00:43:33,577 --> 00:43:39,249
♪ ♪

621
00:43:39,249 --> 00:43:41,418
[growl]

622
00:43:41,418 --> 00:43:46,489
Now starts the final leg
 of their journey inland.

623
00:43:46,489 --> 00:43:53,496
♪ ♪

624
00:43:53,496 --> 00:43:56,166
After a 2,000-mile trek

625
00:43:56,166 --> 00:43:59,003
and teaching her cub
 how to navigate

626
00:43:59,003 --> 00:44:02,372
one of the world's
 most treacherous landscapes...

627
00:44:02,372 --> 00:44:06,343
♪ ♪

628
00:44:06,343 --> 00:44:08,011
...she's home.

629
00:44:08,011 --> 00:44:12,549
♪ ♪

630
00:44:12,549 --> 00:44:15,352
Raising a family is never easy.

631
00:44:15,352 --> 00:44:19,155
♪ ♪

632
00:44:19,155 --> 00:44:22,659
They'll spend the next
two years traveling,

633
00:44:22,659 --> 00:44:25,462
facing every challenge
 together.

634
00:44:25,462 --> 00:44:28,098
♪ ♪

635
00:44:28,098 --> 00:44:33,470
♪ ♪

636
00:44:33,470 --> 00:44:39,876
This mom doing everything
 she can for her cub

637
00:44:39,876 --> 00:44:44,147
in one of the toughest places
 to be a parent.

638
00:44:44,147 --> 00:44:47,284
♪ ♪

639
00:44:47,284 --> 00:44:53,357
♪ ♪