1
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‎六万年前

2
00:00:22,147 --> 00:00:25,608
‎人类第一次走出非洲

3
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‎此后 我们就不曾停下脚步

4
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‎足迹遍布地球的各个角落

5
00:00:40,040 --> 00:00:43,543
‎然而人类之旅只是众多旅程之一

6
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‎任一时刻

7
00:00:47,213 --> 00:00:50,467
‎都有数十亿动物正在迁徙

8
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‎而我们星球的健康正有赖于此

9
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‎片名：我们的星球 2

10
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‎迁徙是至关重要的生存策略

11
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‎不管是为了觅食…

12
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‎为了繁衍

13
00:01:34,928 --> 00:01:36,471
‎还是为了找寻新家

14
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‎一路可谓不乏艰险

15
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‎本片沿途记录

16
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‎日新月异的世界中一段段非凡旅程

17
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‎时至今日 我们才开始明白

18
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‎地球上的一切生命

19
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‎都有赖于迁移的自由

20
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‎（第一章 永不停息的世界）

21
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‎博茨瓦纳的这片土地
‎每年都在发生剧变

22
00:02:52,463 --> 00:02:56,885
‎就在三个月前 这里还有水体浸润

23
00:02:56,968 --> 00:02:58,678
‎如今只剩这些疤痕为证

24
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‎彼时繁茂苍翠

25
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‎如今却荒枯贫瘠

26
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‎这种改变促使动物们集体行动

27
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‎非洲水牛正在穿越喀拉哈里沙漠

28
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‎奔赴仅存的水源

29
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‎小群聚而成大军

30
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‎规模堪称非洲之最

31
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‎每一年 它们都进行同样的朝圣之旅

32
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‎奔赴同一片偏远湿地

33
00:04:35,942 --> 00:04:39,195
‎而其它动物也指望着水牛的湿地之行

34
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‎这些狮子是猎捕水牛的行家

35
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‎对狮群而言

36
00:04:55,420 --> 00:04:58,589
‎水牛大军的到来是一年中的头等要事

37
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‎它们已经守候数周
‎等待水牛大军的到来

38
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‎一双双眼睛
‎密切关注着地平线上的每一个身影

39
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‎终于

40
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‎步步逼近的群落
‎正如一面弯角和肌肉组成的墙

41
00:06:10,411 --> 00:06:13,373
‎但狮子必须找到其中的弱者

42
00:06:31,224 --> 00:06:32,975
‎机会可能来了

43
00:06:34,018 --> 00:06:35,520
‎一头落单的公牛

44
00:06:37,313 --> 00:06:39,565
‎尽管他可能跟牛群走散了

45
00:06:39,649 --> 00:06:42,735
‎但水牛的体重比狮子重四倍

46
00:06:43,319 --> 00:06:46,614
‎而且它还是非洲最凶猛的动物之一

47
00:06:49,075 --> 00:06:51,702
‎狮群必须小心逼近

48
00:07:01,295 --> 00:07:05,299
‎它们通常会漫不经心地
‎一个接一个走向水牛

49
00:07:06,175 --> 00:07:08,761
‎仿佛对猎物不感兴趣

50
00:07:20,815 --> 00:07:24,110
‎事实上 他们是在排兵走阵

51
00:08:13,409 --> 00:08:16,412
‎雌性轮流攻击…

52
00:08:22,084 --> 00:08:23,544
‎消耗水牛的体力

53
00:08:34,722 --> 00:08:37,934
‎此时 体重更胜一筹的雄性加入战斗

54
00:09:13,052 --> 00:09:16,180
‎狮群的猎技已是炉火纯青

55
00:09:16,931 --> 00:09:18,724
‎短短三分钟

56
00:09:19,934 --> 00:09:23,604
‎它们就打败了凶猛的对手

57
00:09:33,614 --> 00:09:36,409
‎狮群赖以生存的这次迁徙

58
00:09:36,492 --> 00:09:39,704
‎只是数百万季节性迁徙的一个缩影

59
00:09:40,830 --> 00:09:42,540
‎而反过来 这种种迁徙

60
00:09:43,165 --> 00:09:45,585
‎又是由另一段旅程促成

61
00:09:46,586 --> 00:09:50,298
‎地球绕日的周期之年

62
00:09:54,093 --> 00:09:55,386
‎转动的过程中

63
00:09:55,469 --> 00:10:00,474
‎地球保持着23.5度的倾斜角

64
00:10:03,728 --> 00:10:06,772
‎这种倾斜造就了不同的季节

65
00:10:09,650 --> 00:10:14,030
‎想要了解其中原理
‎请将目光对准北极

66
00:10:16,490 --> 00:10:19,994
‎这里每年有一半时间不受太阳照射

67
00:10:20,578 --> 00:10:23,039
‎全然被黑暗和寒冬笼罩

68
00:10:28,085 --> 00:10:31,964
‎其余的半年有阳光照射

69
00:10:32,757 --> 00:10:34,717
‎日时较长

70
00:10:42,975 --> 00:10:45,311
‎正是这样的年度周期

71
00:10:45,394 --> 00:10:48,898
‎推动了地球上规模最大的生物大迁移

72
00:10:51,734 --> 00:10:56,864
‎而在北半球
‎它带来了一年中最大的变迁

73
00:10:59,533 --> 00:11:00,576
‎春天

74
00:11:03,204 --> 00:11:09,460
‎（三月）

75
00:11:11,045 --> 00:11:15,841
‎三月下旬
‎昼时延长的速度快过其他任何时节

76
00:11:20,554 --> 00:11:24,350
‎日照增加 土地迅速升温

77
00:11:26,102 --> 00:11:27,812
‎由此引发暴雨

78
00:11:29,855 --> 00:11:33,150
‎北半球骤然变暖

79
00:11:34,360 --> 00:11:35,361
‎也更加湿润

80
00:11:37,780 --> 00:11:39,281
‎十分利于植物生长

81
00:11:47,832 --> 00:11:50,459
‎大地一片新绿

82
00:11:55,506 --> 00:12:01,303
‎一种动物以无敌之势
‎尽享植物生长的繁荣

83
00:12:08,811 --> 00:12:10,229
‎就在一周前

84
00:12:10,312 --> 00:12:12,606
‎这只埃塞俄比亚的沙漠蝗

85
00:12:13,315 --> 00:12:17,278
‎还只是一个怯生生和孤零零的小家伙
‎而且几乎不怎么动地方

86
00:12:21,824 --> 00:12:23,451
‎现在可不然

87
00:12:30,166 --> 00:12:32,710
‎随着食物猛增

88
00:12:33,419 --> 00:12:36,672
‎蝗虫开启了集群模式

89
00:12:40,384 --> 00:12:41,927
‎它们开始行军

90
00:12:42,678 --> 00:12:45,306
‎并以十倍的速度繁殖

91
00:12:54,148 --> 00:12:55,900
‎随着蝗虫数目暴增

92
00:12:55,983 --> 00:12:58,194
‎土地被啃得一片光秃

93
00:13:02,448 --> 00:13:05,409
‎所以为了寻找更多的食物

94
00:13:05,493 --> 00:13:08,245
‎它们必须不断迁移

95
00:13:26,514 --> 00:13:28,307
‎蝗群不断扩大

96
00:13:32,728 --> 00:13:34,230
‎增长

97
00:13:38,651 --> 00:13:41,862
‎沿途植物被一扫而光

98
00:13:45,157 --> 00:13:47,159
‎但这只是开始

99
00:13:49,036 --> 00:13:52,289
‎陆路迁移的范围十分有限

100
00:13:55,376 --> 00:13:56,502
‎若想去到更远的地方

101
00:13:58,087 --> 00:14:00,256
‎就必须改换形式

102
00:14:12,226 --> 00:14:14,228
‎蝗虫长出了翅膀

103
00:14:36,166 --> 00:14:39,086
‎如今 沙漠蝗胃口更盛

104
00:14:39,670 --> 00:14:42,756
‎整支大军腾空而起

105
00:14:51,974 --> 00:14:52,850
‎它们进食…

106
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‎飞行

107
00:15:01,942 --> 00:15:02,902
‎进食…

108
00:15:04,945 --> 00:15:05,988
‎飞行

109
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‎它们聚集一处 形成一只超级大军

110
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‎浩浩荡荡两千亿之众

111
00:15:23,005 --> 00:15:26,175
‎这是70年来规模最大的蝗群

112
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‎它们每天消耗的食物

113
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‎达40万吨

114
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‎所以若想全员果腹

115
00:15:43,692 --> 00:15:46,612
‎就必须迁移得更远更快

116
00:15:54,954 --> 00:15:57,581
‎蝗群日行100公里

117
00:15:57,665 --> 00:16:00,292
‎飞越农田与城镇

118
00:16:10,970 --> 00:16:13,973
‎席卷一个又一个国家…

119
00:16:16,350 --> 00:16:18,394
‎最令人震惊的是

120
00:16:18,477 --> 00:16:20,896
‎它们甚至横跨了红海

121
00:16:23,857 --> 00:16:27,069
‎（巴基斯坦）

122
00:16:27,152 --> 00:16:32,741
‎这是首次有蝗群
‎飞跃喜马拉雅山脉 到达西藏

123
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‎所到之处

124
00:16:41,375 --> 00:16:42,960
‎一片狼藉

125
00:16:54,346 --> 00:16:58,976
‎蝗群不断迁移
‎直至季节更替 带来干旱

126
00:17:01,311 --> 00:17:04,023
‎当食物最终消失…

127
00:17:06,817 --> 00:17:08,235
‎蝗虫也会消失

128
00:17:15,909 --> 00:17:19,413
‎（四月）

129
00:17:19,496 --> 00:17:24,293
‎四月 北半球白昼持续变长

130
00:17:26,712 --> 00:17:30,799
‎日照增加 海洋变暖

131
00:17:30,883 --> 00:17:33,594
‎藻类生长繁盛

132
00:17:33,677 --> 00:17:36,180
‎食源骤然丰富

133
00:17:39,600 --> 00:17:42,728
‎对一种动物而言
‎此时正是旅行的时机

134
00:17:51,653 --> 00:17:55,908
‎午夜 在不列颠哥伦比亚
‎离岸处的一座偏远岛屿

135
00:17:59,328 --> 00:18:00,370
‎地面之下…

136
00:18:02,456 --> 00:18:04,041
‎有东西在骚动

137
00:18:11,507 --> 00:18:15,886
‎这只幼年的扁嘴海雀
‎不久前刚刚破壳而出

138
00:18:17,805 --> 00:18:22,101
‎但它即将经历一段无比艰辛的旅程

139
00:18:25,729 --> 00:18:27,731
‎她还没有吃到第一餐

140
00:18:28,607 --> 00:18:30,609
‎此时正急需食物

141
00:18:34,196 --> 00:18:35,823
‎海雀妈妈发出联络呼叫

142
00:18:40,619 --> 00:18:44,331
‎岛上饥肠辘辘的雏鸟从洞穴钻出

143
00:18:46,041 --> 00:18:48,210
‎循着父母的叫声而去

144
00:18:50,587 --> 00:18:53,340
‎可如果它们以为立马就有东西吃

145
00:18:54,341 --> 00:18:56,301
‎那可要失望了

146
00:19:02,141 --> 00:19:04,393
‎扁嘴海雀是唯一一种

147
00:19:04,935 --> 00:19:07,938
‎完全在海上进行哺喂的海鸟

148
00:19:10,232 --> 00:19:13,026
‎雏鸟只需到达海上

149
00:19:15,362 --> 00:19:17,197
‎它们尚未学会飞行

150
00:19:17,781 --> 00:19:19,867
‎所以到达大海的唯一办法

151
00:19:20,784 --> 00:19:22,035
‎就是走路

152
00:19:29,585 --> 00:19:33,589
‎尽管为了躲避天敌
‎选择趁夜赶路是明智之举

153
00:19:34,381 --> 00:19:37,676
‎但夜间也更难辨清去路

154
00:19:45,267 --> 00:19:48,103
‎况且 如果你的身型
‎只比高尔夫球大一点点

155
00:19:49,062 --> 00:19:50,981
‎任何东西都可能成为阻碍

156
00:19:56,904 --> 00:20:00,407
‎哪怕是再低矮的原木…

157
00:20:02,534 --> 00:20:04,912
‎再小的溪流 都可能挡住它们去路

158
00:20:10,000 --> 00:20:13,879
‎一些雏鸟的征程尚未开始便已告终

159
00:20:22,137 --> 00:20:24,306
‎而这只并不然

160
00:20:28,060 --> 00:20:30,020
‎终于到达海滩

161
00:20:31,313 --> 00:20:35,692
‎这是它最后一次脚踏陆地
‎下一次就要等两年后了

162
00:20:41,323 --> 00:20:42,449
‎为了寻找母亲

163
00:20:42,950 --> 00:20:45,077
‎雏鸟在黑暗中发声呼叫

164
00:21:00,008 --> 00:21:01,426
‎再次团聚

165
00:21:04,888 --> 00:21:07,516
‎但小家伙还饥肠辘辘

166
00:21:12,604 --> 00:21:16,149
‎为了到达距离最近的食源
‎它们片刻不停地划水

167
00:21:17,943 --> 00:21:21,363
‎居然坚持了70公里

168
00:21:27,995 --> 00:21:30,539
‎到了这里 母亲终于可以潜入水下

169
00:21:30,622 --> 00:21:33,583
‎为雏鸟衔来第一顿磷虾美餐

170
00:21:34,793 --> 00:21:37,170
‎但这只是短暂休息

171
00:21:39,881 --> 00:21:43,427
‎它们还要继续划水上千公里

172
00:21:46,430 --> 00:21:50,350
‎此次迁徙耗时一个月
‎目标是到达富饶的北方海域

173
00:21:50,434 --> 00:21:51,810
‎在那里 它们可以尽享美食

174
00:21:53,437 --> 00:21:58,400
‎这大概是初生雏鸟
‎所经历过最为漫长的旅程

175
00:22:04,740 --> 00:22:07,743
‎因为夏日的海洋十分丰产

176
00:22:08,702 --> 00:22:13,457
‎扁嘴海雀的整个生命历程
‎几乎都是在海上度过

177
00:22:19,838 --> 00:22:25,552
‎（五月）

178
00:22:26,470 --> 00:22:30,057
‎夏威夷西北1600公里处

179
00:22:31,183 --> 00:22:33,727
‎有一片偏僻之地

180
00:22:35,437 --> 00:22:36,480
‎莱桑岛

181
00:22:40,692 --> 00:22:44,321
‎这里生活着全世界最大的海鸟之一

182
00:22:48,700 --> 00:22:50,911
‎莱桑信天翁

183
00:22:55,791 --> 00:22:58,543
‎这只雏鸟才六周大

184
00:22:58,627 --> 00:23:02,422
‎日后将成为一位杰出的长途旅者

185
00:23:04,299 --> 00:23:09,513
‎60年的生命时光中
‎它将飞行数百万公里

186
00:23:11,181 --> 00:23:13,892
‎不过现在 四个月大的它

187
00:23:13,975 --> 00:23:15,727
‎还不会飞行

188
00:23:16,561 --> 00:23:18,522
‎哪里也去不了

189
00:23:23,527 --> 00:23:24,945
‎与海雀不同

190
00:23:25,028 --> 00:23:27,572
‎信天翁只能靠父母哺喂

191
00:23:28,156 --> 00:23:29,491
‎饭来张口

192
00:23:32,577 --> 00:23:36,456
‎但它们很可能在三千公里外捕鱼

193
00:23:37,874 --> 00:23:40,252
‎所以它可能要等上好一阵子

194
00:23:42,003 --> 00:23:43,880
‎淋着瓢泼大雨…

195
00:23:47,592 --> 00:23:49,136
‎迎着呼啸狂风…

196
00:23:51,721 --> 00:23:53,765
‎顶着炎炎烈日

197
00:24:03,316 --> 00:24:06,945
‎每只飞过天边的鸟儿都会带来希望

198
00:24:14,119 --> 00:24:15,328
‎一只信天翁

199
00:24:18,540 --> 00:24:20,083
‎然而它并非同类

200
00:24:21,668 --> 00:24:22,961
‎黑脚信天翁

201
00:24:25,297 --> 00:24:28,341
‎不过 她十有八九也带回了食物

202
00:24:31,386 --> 00:24:34,848
‎饥肠辘辘的莱桑雏鸟想试试运气

203
00:24:42,272 --> 00:24:46,401
‎显然 对这位母亲而言 自家优先

204
00:24:59,748 --> 00:25:02,167
‎不过 有些东西貌似救命

205
00:25:03,418 --> 00:25:05,629
‎实则夺命

206
00:25:08,757 --> 00:25:12,344
‎放眼岛上 雏鸟正在死去

207
00:25:17,349 --> 00:25:20,685
‎海洋中大量的塑料

208
00:25:22,020 --> 00:25:26,149
‎甚至被冲刷到地球上最为偏远的岛屿

209
00:25:27,359 --> 00:25:29,694
‎海流将垃圾带到了此处

210
00:25:34,783 --> 00:25:40,330
‎海鸟误将塑料漂浮物
‎当作食物带回给雏鸟

211
00:25:40,872 --> 00:25:42,916
‎却一不小心要了它们的命

212
00:25:47,629 --> 00:25:52,717
‎几乎可以肯定
‎岛上的所有雏鸟胃里都有塑料

213
00:25:55,220 --> 00:25:58,640
‎那些吃进太多塑料的会被活活饿死

214
00:26:04,396 --> 00:26:07,607
‎莱桑信天翁面临着巨大的危险

215
00:26:09,484 --> 00:26:13,238
‎它们往往比其他海鸟吃下更多塑料

216
00:26:14,573 --> 00:26:17,242
‎而且情况每年都在恶化

217
00:26:28,795 --> 00:26:31,840
‎终于 在海上奔波近三周后…

218
00:26:34,050 --> 00:26:36,511
‎这只雏鸟的父亲回来了

219
00:26:46,187 --> 00:26:48,523
‎经历了长久的分离

220
00:26:50,275 --> 00:26:52,861
‎它们需要重新建立感情

221
00:27:02,996 --> 00:27:07,000
‎这可能是这只雏鸟
‎从父母那里获得的最后一餐

222
00:27:09,419 --> 00:27:12,964
‎而其中几乎肯定含有塑料

223
00:27:26,978 --> 00:27:31,149
‎父亲回归太平洋
‎继续纵横驰骋的生活

224
00:27:32,984 --> 00:27:35,570
‎留下雏鸟听天由命

225
00:27:38,990 --> 00:27:41,409
‎不过 对他而言 一切还没有结束

226
00:27:44,788 --> 00:27:48,416
‎信天翁通常会吐出难以消化的部分

227
00:27:48,500 --> 00:27:50,960
‎例如鱿鱼嘴和骨头

228
00:27:55,006 --> 00:28:00,595
‎不过吐出打火机和瓶盖就费劲多了

229
00:28:13,024 --> 00:28:14,234
‎而这只雏鸟

230
00:28:16,152 --> 00:28:17,487
‎挺过了难关

231
00:28:21,825 --> 00:28:23,118
‎如此一来

232
00:28:23,201 --> 00:28:26,579
‎他距离起飞又近了一步

233
00:28:28,456 --> 00:28:31,084
‎再过几周 待到顺风之时

234
00:28:31,167 --> 00:28:34,462
‎他将终能得以首次展露身手

235
00:28:34,546 --> 00:28:37,757
‎跻身最伟大的海洋旅行者之列

236
00:28:44,931 --> 00:28:47,851
‎我们倾斜的星球
‎在太空中的运行轨迹

237
00:28:47,934 --> 00:28:50,979
‎对一个地方的影响远胜于别处

238
00:28:51,855 --> 00:28:57,026
‎（六月）

239
00:28:57,110 --> 00:28:59,070
‎北半球处于夏季

240
00:29:02,615 --> 00:29:05,410
‎北极正受到太阳的照射

241
00:29:05,493 --> 00:29:08,747
‎昼夜沐浴在日光中

242
00:29:08,830 --> 00:29:11,541
‎照射融化覆盖着冰雪的海洋

243
00:29:23,928 --> 00:29:26,097
‎为了在不断变化的世界中求生

244
00:29:26,681 --> 00:29:29,350
‎各种生命也必须以动应变

245
00:29:59,881 --> 00:30:03,760
‎这只北极熊幼崽的家
‎每年都会发生巨大的变化

246
00:30:04,344 --> 00:30:07,055
‎他无法留守在有限的领地之内

247
00:30:11,184 --> 00:30:14,562
‎而是必须漫游数千公里

248
00:30:14,646 --> 00:30:16,231
‎寻找海豹

249
00:30:28,785 --> 00:30:32,247
‎然而 每年夏天 随着冰雪融化

250
00:30:33,623 --> 00:30:35,959
‎他只能花更多时间游泳…

251
00:30:39,838 --> 00:30:41,506
‎而非行走

252
00:30:48,012 --> 00:30:51,099
‎如今 他每天要游近八个小时

253
00:31:01,568 --> 00:31:05,697
‎他能闻到30公里外的猎物

254
00:31:09,534 --> 00:31:13,955
‎所以他知道 这只髯海豹就在附近

255
00:31:27,510 --> 00:31:30,263
‎海豹并没有意识到有危险

256
00:31:32,557 --> 00:31:35,351
‎而北极熊正需要它继续蒙在鼓里

257
00:32:16,601 --> 00:32:20,730
‎水中猎食的成功率很低

258
00:32:42,669 --> 00:32:45,588
‎或许第三次会走运

259
00:33:38,891 --> 00:33:44,272
‎这只小北极熊
‎尚未掌握海上追踪的诀窍

260
00:33:46,274 --> 00:33:48,359
‎但掌握此项本领非常重要

261
00:33:49,444 --> 00:33:52,905
‎一年年过去 它可能会越来越依赖它

262
00:33:58,536 --> 00:34:00,455
‎地球气候正在变暖

263
00:34:06,919 --> 00:34:09,881
‎而受此效应影响最大的

264
00:34:10,548 --> 00:34:12,050
‎莫过于北极

265
00:34:16,054 --> 00:34:18,806
‎今年的气温

266
00:34:18,890 --> 00:34:22,769
‎上升到了惊人的38摄氏度‎…

267
00:34:26,564 --> 00:34:29,442
‎导致海冰以前所未有的速度融化

268
00:34:32,862 --> 00:34:36,991
‎一种北极动物受此影响最大

269
00:34:47,251 --> 00:34:48,211
‎为了吃食

270
00:34:48,294 --> 00:34:52,548
‎海象需要浅层海床

271
00:34:54,175 --> 00:34:55,843
‎丰富的蛤类

272
00:34:57,011 --> 00:35:00,765
‎以及可供休息的浮冰

273
00:35:10,983 --> 00:35:14,195
‎然而 如今这样的地方已越来越少

274
00:35:17,448 --> 00:35:21,119
‎这使得每年的夏季
‎都比上一年更加难熬

275
00:35:22,787 --> 00:35:25,456
‎对于刚做母亲的海象而言更是如此

276
00:35:30,586 --> 00:35:35,466
‎三天前
‎她不得不离开海象群独自生产

277
00:35:38,469 --> 00:35:42,014
‎从那之后 她一直守在小海象身边

278
00:35:53,985 --> 00:35:57,530
‎哺育期的海象妈妈
‎所需的食物几乎是原来的两倍

279
00:35:59,115 --> 00:36:03,286
‎但她们不能离开幼崽自己进食

280
00:36:05,997 --> 00:36:08,875
‎所以 她必须找寻其它海象

281
00:36:09,792 --> 00:36:12,253
‎帮她照顾幼崽

282
00:36:20,678 --> 00:36:24,140
‎小海象一生下来就会游泳

283
00:36:28,561 --> 00:36:31,606
‎但他还不够强壮 无法远行

284
00:36:35,151 --> 00:36:37,403
‎所以 第一次旅程

285
00:36:38,529 --> 00:36:40,364
‎他搭了便车

286
00:36:53,419 --> 00:36:55,630
‎浮冰数量逐年减少

287
00:36:55,713 --> 00:36:58,341
‎海象只能游到更远的地方寻求帮助

288
00:37:03,137 --> 00:37:06,766
‎而在求助成功之前
‎海象妈妈都无法进食

289
00:37:15,274 --> 00:37:17,401
‎即便找到其它海象

290
00:37:17,944 --> 00:37:22,114
‎还必须要有足够低矮的浮冰
‎让小海象能够爬上冰面

291
00:37:26,869 --> 00:37:27,954
‎太高了

292
00:37:43,010 --> 00:37:44,720
‎这块看起来刚刚好

293
00:37:51,102 --> 00:37:53,854
‎然而 适宜的浮冰太过稀少

294
00:37:53,938 --> 00:37:56,482
‎空间十分有限

295
00:38:17,461 --> 00:38:20,715
‎这并不是它们所需要的欢迎

296
00:38:32,226 --> 00:38:34,687
‎就算有空间足够的浮冰

297
00:38:34,770 --> 00:38:38,065
‎没有帮手 海象妈妈依旧无法觅食

298
00:38:38,649 --> 00:38:40,401
‎只能守着小海象

299
00:38:51,662 --> 00:38:53,789
‎它们必须继续寻找

300
00:38:56,375 --> 00:39:00,171
‎在接下来的三年里
‎小海象都要依赖妈妈

301
00:39:02,631 --> 00:39:04,216
‎不管妈妈去哪里

302
00:39:05,051 --> 00:39:06,510
‎幼崽都跟着

303
00:39:11,682 --> 00:39:16,312
‎未来十年内
‎夏季海冰可能会完全消失

304
00:39:24,403 --> 00:39:25,446
‎一旦发生这种状况

305
00:39:25,529 --> 00:39:28,783
‎即便是北极最老练的旅行者

306
00:39:29,367 --> 00:39:31,619
‎都可能无处可去

307
00:39:46,801 --> 00:39:48,302
‎六月下旬

308
00:39:48,386 --> 00:39:52,348
‎北半球感受到地球倾斜的全面影响

309
00:39:53,224 --> 00:39:56,936
‎日照量也到达一年中的顶峰

310
00:39:58,270 --> 00:40:00,773
‎在太平洋的某处角落

311
00:40:00,856 --> 00:40:04,193
‎此时也是一年中的绝佳机会

312
00:40:12,368 --> 00:40:13,536
‎六个月来

313
00:40:13,619 --> 00:40:18,040
‎阿拉斯加的白令海
‎一直显得毫无生气 苍茫空虚

314
00:40:32,596 --> 00:40:34,682
‎尔后 在六月的某日…

315
00:40:37,184 --> 00:40:39,395
‎一切都变了

316
00:40:43,482 --> 00:40:45,359
‎一只只座头鲸

317
00:40:46,193 --> 00:40:48,195
‎经过历时一个月的旅程到达此处…

318
00:40:52,283 --> 00:40:55,995
‎参加鲸界顶级盛事

319
00:40:58,414 --> 00:40:59,999
‎数千只座头鲸

320
00:41:03,002 --> 00:41:04,670
‎太平洋之上

321
00:41:04,753 --> 00:41:07,256
‎其他的旅客也在纷纷赶路

322
00:41:09,884 --> 00:41:13,095
‎灰鹱日夜兼程 想要及时赶到…

323
00:41:17,099 --> 00:41:20,686
‎单日不间断飞行一千公里

324
00:41:23,063 --> 00:41:25,191
‎如此重要场合

325
00:41:25,274 --> 00:41:27,943
‎它们甚至不辞辛苦
‎从世界的另一边赶来

326
00:41:30,529 --> 00:41:32,907
‎六万五千公里

327
00:41:33,407 --> 00:41:36,911
‎这是地球上动物迁徙的最远航程

328
00:41:43,584 --> 00:41:46,212
‎数百万只灰鹱加入鲸群的行列

329
00:41:54,345 --> 00:41:56,430
‎大家纷纷来此觅食

330
00:42:06,690 --> 00:42:10,986
‎这是地球上最为壮观的聚会之一

331
00:42:15,824 --> 00:42:17,785
‎就在五个月前

332
00:42:18,285 --> 00:42:21,205
‎这里每日光照时间只有七小时

333
00:42:23,958 --> 00:42:26,627
‎而现在 光照时间长达17个小时

334
00:42:29,171 --> 00:42:34,218
‎这种变化
‎使得浮游生物和磷虾的数量激增

335
00:42:36,387 --> 00:42:41,517
‎对这些鲸鱼而言
‎这可能是一整年中唯一的饱餐机会

336
00:42:43,644 --> 00:42:44,603
‎整个夏季

337
00:42:45,604 --> 00:42:49,775
‎每头鲸鱼收入腹中的食量可达900吨

338
00:42:59,410 --> 00:43:03,539
‎它们只有90天时间可以尽情美餐

339
00:43:09,295 --> 00:43:11,297
‎很快 白天缩短

340
00:43:11,797 --> 00:43:14,466
‎饕餮盛宴也将结束

341
00:43:16,385 --> 00:43:19,305
‎到时 它们都将返回南方

342
00:43:22,141 --> 00:43:25,853
‎地球的倾斜之旅所带来的种种良机

343
00:43:25,936 --> 00:43:29,064
‎既巨大又短暂

344
00:43:33,193 --> 00:43:35,779
‎经历了一个月的漫长暑日

345
00:43:36,280 --> 00:43:39,825
‎北太平洋的温度已经达到最高峰

346
00:43:45,497 --> 00:43:48,542
‎海洋中一位捕食者察觉到了变化

347
00:43:48,626 --> 00:43:50,669
‎并且规划了新的航道

348
00:44:01,597 --> 00:44:02,931
‎一只虎鲨

349
00:44:03,432 --> 00:44:07,394
‎长途跋涉一千公里 横跨太平洋

350
00:44:14,526 --> 00:44:16,987
‎在地球磁场的引导下

351
00:44:18,113 --> 00:44:21,367
‎她径直向目的地…

352
00:44:25,412 --> 00:44:27,414
‎莱桑岛游去

353
00:44:30,042 --> 00:44:31,710
‎无独有偶

354
00:44:36,090 --> 00:44:40,844
‎这一物种经历了漫长的旅程
‎堪称鲨鱼迁徙的距离之最

355
00:44:43,389 --> 00:44:47,643
‎而且虎鲨猎食的动物
‎也比其他鲨鱼更加广泛

356
00:44:49,269 --> 00:44:52,523
‎其中甚至还包括鸟类

357
00:44:58,904 --> 00:45:02,408
‎这只莱桑信天翁

358
00:45:02,491 --> 00:45:06,787
‎自两周前被父母抛下后 就再未进食

359
00:45:10,582 --> 00:45:11,792
‎为了觅食

360
00:45:12,292 --> 00:45:15,045
‎他必须离开小岛

361
00:45:18,882 --> 00:45:23,679
‎但世界上最大的海鸟
‎起飞需要借助很大的风力

362
00:45:26,265 --> 00:45:28,642
‎风随时会来

363
00:45:33,856 --> 00:45:39,570
‎七月 在高温作用下
‎海上会形成热带风暴…

364
00:45:43,991 --> 00:45:46,744
‎把风带到莱桑岛

365
00:45:47,911 --> 00:45:51,373
‎也为信天翁雏鸟送来了离岛的旅票

366
00:45:58,922 --> 00:46:01,049
‎微风渐劲

367
00:46:02,134 --> 00:46:05,804
‎甚至有足够的力量托起一只信天翁

368
00:46:10,017 --> 00:46:14,646
‎黑脚信天翁的雏鸟总是率先起飞

369
00:46:30,204 --> 00:46:33,290
‎雏鸟的第一次飞行向来不会长久

370
00:46:37,920 --> 00:46:40,881
‎而在此处 这通常也是最后一次飞行

371
00:46:52,309 --> 00:46:55,687
‎虎鲨来了

372
00:47:12,621 --> 00:47:14,498
‎而且不会轻易失手

373
00:47:27,261 --> 00:47:32,015
‎这让年幼的信天翁不免心生畏惧

374
00:47:33,559 --> 00:47:34,518
‎然而 机不可失

375
00:47:35,894 --> 00:47:36,770
‎时不再来

376
00:47:46,905 --> 00:47:48,907
‎如果他到达远洋水域

377
00:47:49,491 --> 00:47:53,453
‎很可能五年内都不会着陆

378
00:47:55,706 --> 00:47:58,584
‎然而 没有犯错的余地

379
00:48:07,843 --> 00:48:10,596
‎是时候抛开谨慎顾虑

380
00:48:13,974 --> 00:48:16,894
‎该起飞了

381
00:49:45,691 --> 00:49:48,568
‎字幕翻译：Ellen L