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These are the user uploaded subtitles that are being translated: 1 00:01:03,480 --> 00:01:05,814 NARRATOR: Of all the planets in our universe, 2 00:01:05,982 --> 00:01:09,818 we know of only one that can support life. 3 00:01:15,408 --> 00:01:18,368 Just the right distance from the sun, 4 00:01:18,536 --> 00:01:20,954 it has a perfect climate. 5 00:01:29,380 --> 00:01:30,964 Earth rests at an angle 6 00:01:31,132 --> 00:01:34,968 of exactly 23 and a half degrees to the sun. 7 00:01:36,054 --> 00:01:38,013 Without that crucial tilt, 8 00:01:38,181 --> 00:01:41,642 everything as we know it would be different. 9 00:01:50,235 --> 00:01:52,820 For by it, the seasons are created, 10 00:01:52,987 --> 00:01:57,032 the extremes of climate, hot and cold, 11 00:01:57,200 --> 00:02:01,370 and landscapes of spectacular beauty. 12 00:03:00,221 --> 00:03:05,142 We spend a year with our fellow creatures as they struggle to raise their young 13 00:03:05,310 --> 00:03:08,437 in a world that is ever-changing. 14 00:03:30,335 --> 00:03:34,838 January. It's the dead of winter in the high Arctic, 15 00:03:35,006 --> 00:03:38,675 and there has been no sun for over a month. 16 00:03:46,309 --> 00:03:50,479 A father, alone in an icy wilderness. 17 00:03:50,647 --> 00:03:53,982 He scavenges for food in the permanent darkness. 18 00:03:56,986 --> 00:03:59,279 But there is little to eat. 19 00:04:08,122 --> 00:04:10,916 Every living thing is waiting. 20 00:04:35,692 --> 00:04:37,025 At long last, 21 00:04:37,193 --> 00:04:41,363 the sun makes its first appearance over the horizon. 22 00:04:45,702 --> 00:04:49,746 And something else makes an appearance for the first time too. 23 00:04:50,331 --> 00:04:55,627 A mother polar bear has been underground in her den the whole winter. 24 00:05:08,558 --> 00:05:10,851 It's fresh-powder conditions up here, 25 00:05:11,019 --> 00:05:14,187 and, after being cooped up under the snow for so long, 26 00:05:14,355 --> 00:05:17,399 she can't help but enjoy the slopes. 27 00:05:21,571 --> 00:05:23,905 But she's not alone. 28 00:05:39,589 --> 00:05:41,214 They're 2 months old now, 29 00:05:41,382 --> 00:05:45,927 and this is the very first time they've seen the light of day. 30 00:05:46,095 --> 00:05:48,722 [CUBS BLEATING] 31 00:06:24,258 --> 00:06:26,843 It's breakfast time for the little ones. 32 00:06:27,011 --> 00:06:31,556 Mom uses the promise of food to coax them across the slopes. 33 00:06:31,724 --> 00:06:35,811 But it's not the easiest place to take your first steps. 34 00:07:18,813 --> 00:07:21,189 Milk is the breakfast of choice here. 35 00:07:21,357 --> 00:07:24,151 In fact, it's the only choice here. 36 00:07:24,318 --> 00:07:27,571 It's all the cubs have known since birth. 37 00:07:36,497 --> 00:07:41,793 Mom hasn't eaten for five months, and she's lost half her body weight. 38 00:07:51,721 --> 00:07:54,556 But still, she'll stay at home on these slopes 39 00:07:54,724 --> 00:07:57,809 and nurse the cubs until they find their footing. 40 00:07:58,811 --> 00:08:02,564 Which, as you can see, might take a little while. 41 00:08:06,402 --> 00:08:09,779 Every year at this time, they need food desperately. 42 00:08:09,947 --> 00:08:12,324 They'll have to get down and join Dad on the ice 43 00:08:12,492 --> 00:08:15,076 before it starts to melt in the warming sunlight. 44 00:08:17,246 --> 00:08:21,750 The sea ice is the only place the bears can hunt for seals. 45 00:08:22,084 --> 00:08:24,169 If they don't make it in time, 46 00:08:24,337 --> 00:08:28,965 they'll lose their hunting platform, and the family could starve. 47 00:08:31,302 --> 00:08:35,055 So far, the ice is strong enough to support their dad. 48 00:08:35,223 --> 00:08:38,391 But he won't be much help to Mom and the kids. 49 00:08:38,559 --> 00:08:41,728 Instinct leads him to hunt for himself. 50 00:08:47,109 --> 00:08:50,654 This race to reach the sea ice is more urgent than ever. 51 00:08:50,821 --> 00:08:55,116 Our planet is warming, and the ice is melting earlier every year. 52 00:08:58,412 --> 00:08:59,829 It's ten days later 53 00:08:59,997 --> 00:09:04,918 and time for Mom to lead the growing cubs down to the sea ice. 54 00:09:06,629 --> 00:09:08,171 They've found their feet now, 55 00:09:08,339 --> 00:09:12,008 but they seem to be taking them in the wrong direction. 56 00:09:24,105 --> 00:09:28,024 Unlike humans, polar-bear cubs don't always listen to their moms. 57 00:09:41,956 --> 00:09:43,790 [MOTHER BEAR SNORTS] 58 00:10:03,019 --> 00:10:06,396 Finally, everybody is pointed in the right direction, 59 00:10:06,564 --> 00:10:09,608 and the journey to the ice begins. 60 00:10:12,820 --> 00:10:14,863 [CRACKING] 61 00:10:21,037 --> 00:10:26,207 Just a few miles from the coast, the ice is already breaking up. 62 00:10:38,137 --> 00:10:40,430 Mom leads her cubs to start their life 63 00:10:40,598 --> 00:10:44,225 at the edge of this increasingly dangerous new world. 64 00:10:52,068 --> 00:10:56,655 What they don't know is the harsh reality of life in the Arctic. 65 00:10:56,822 --> 00:11:01,576 It's unlikely that both cubs will survive their first year. 66 00:11:04,455 --> 00:11:06,915 [CRACKING] 67 00:11:17,593 --> 00:11:23,682 A thousand miles south of the bears, stunted conifers are still locked in ice. 68 00:11:23,849 --> 00:11:29,771 They mark the tree line of our planet and the start of the boreal forest. 69 00:11:33,401 --> 00:11:37,737 This vast belt of trees forms an almost unbroken circle 70 00:11:37,905 --> 00:11:40,365 around the north of the globe. 71 00:11:51,210 --> 00:11:53,962 These conifers have needle-shaped leaves, 72 00:11:54,130 --> 00:11:55,880 virtually inedible, 73 00:11:56,048 --> 00:11:58,842 so the forest supports very little animal life. 74 00:12:09,145 --> 00:12:14,232 In this silent world, footprints rarely mark the snow. 75 00:12:14,400 --> 00:12:18,153 And those who do live here are so hard to glimpse, 76 00:12:19,321 --> 00:12:21,656 they're like spirits. 77 00:12:39,717 --> 00:12:43,052 The lynx roams hundreds of miles in search of prey. 78 00:12:43,763 --> 00:12:47,932 It may never visit the same patch of forest twice. 79 00:12:51,061 --> 00:12:55,607 This creature is the very essence of wilderness. 80 00:13:08,204 --> 00:13:11,915 One-third of all the trees on Earth are here, 81 00:13:12,082 --> 00:13:17,378 as many trees as in all the world's rain forests combined. 82 00:13:20,257 --> 00:13:25,053 As the planet tilts toward the sun, spring creeps up from the south, 83 00:13:25,221 --> 00:13:29,432 and the boreal is unveiled from a blanket of snow. 84 00:13:30,726 --> 00:13:33,061 The forest produces so much oxygen 85 00:13:33,229 --> 00:13:37,190 that it refreshes the atmosphere of the entire planet. 86 00:13:49,286 --> 00:13:50,954 [BIRDS CALLING] 87 00:13:52,748 --> 00:13:57,168 April, and life starts returning to the warming north. 88 00:14:05,261 --> 00:14:09,973 Visitors flock to this haven from all corners of our planet. 89 00:14:10,808 --> 00:14:14,269 They've come to make the most of the brief flush of spring food. 90 00:14:15,437 --> 00:14:17,856 And to have their babies. 91 00:14:22,987 --> 00:14:27,699 In our changing world, every new generation is precious. 92 00:14:51,015 --> 00:14:53,474 As the snow melts and the days grow longer, 93 00:14:53,809 --> 00:14:56,811 caribou, more than three million of them, 94 00:14:56,979 --> 00:15:00,148 start their migration across the tundra. 95 00:15:16,457 --> 00:15:19,208 It's the longest overland migration on Earth, 96 00:15:19,376 --> 00:15:23,212 with some herds traveling 2,000 miles in a single year. 97 00:15:25,299 --> 00:15:30,053 And it's totally dependent on vast open spaces. 98 00:15:36,894 --> 00:15:38,811 The herd stays on the move, 99 00:15:38,979 --> 00:15:44,567 so newborn calves have to be on their feet and running from the day they are born. 100 00:16:04,421 --> 00:16:08,174 But these vast herds don't travel alone. 101 00:16:21,689 --> 00:16:25,066 Wolves shadow them all along the way, 102 00:16:25,234 --> 00:16:27,193 and they're hungry. 103 00:17:04,982 --> 00:17:08,276 At first, the attack seems casual and random, 104 00:17:08,444 --> 00:17:12,113 but this running at the herd is a tactic to generate panic. 105 00:17:26,754 --> 00:17:30,423 In the chaos, a calf is separated from her mother. 106 00:17:34,678 --> 00:17:36,846 [CALF BLEATING] 107 00:17:44,605 --> 00:17:48,066 The calf is young, but it's capable of outrunning the wolf 108 00:17:48,233 --> 00:17:51,027 as long as it keeps its footing. 109 00:18:03,832 --> 00:18:05,875 At this point, the odds are even. 110 00:18:06,043 --> 00:18:08,336 Either the caribou will make a mistake, 111 00:18:08,504 --> 00:18:12,215 or after a mile or so, the wolf will give up. 112 00:18:51,380 --> 00:18:56,217 Spring in the Artic, and already the sun never sets. 113 00:19:00,722 --> 00:19:06,394 And further south, the sunlight begins to work her glorious magic. 114 00:19:25,581 --> 00:19:31,252 [BIRDS CHIRPING] 115 00:20:05,954 --> 00:20:08,122 These are the forests that we know well, 116 00:20:08,290 --> 00:20:11,459 the broadleaf woodlands of Europe and North America. 117 00:20:16,048 --> 00:20:17,632 More than any other, 118 00:20:17,799 --> 00:20:21,344 these have been crowded out by towns and farmlands. 119 00:20:21,511 --> 00:20:24,096 Only fragments remain. 120 00:20:25,515 --> 00:20:29,977 The summers are longer here, and deciduous trees can flourish. 121 00:20:30,145 --> 00:20:32,813 They're far more edible than the conifers of the north, 122 00:20:32,981 --> 00:20:36,192 so these forests bustle with life. 123 00:20:39,821 --> 00:20:44,700 Spring also means flight school for the mandarin ducks. 124 00:20:45,744 --> 00:20:51,832 Mom is in her nest high in the treetops, and it's her job to lead the way. 125 00:20:52,000 --> 00:20:54,168 [CHIRPING] 126 00:21:06,515 --> 00:21:09,183 It's their first flight. 127 00:21:20,654 --> 00:21:26,242 Actually, I wouldn't call it flying, as much as falling with style. 128 00:21:53,895 --> 00:21:57,231 Wait. There are two missing. 129 00:22:11,747 --> 00:22:14,665 A perfect landing, sort of. 130 00:22:20,756 --> 00:22:23,299 With one big adventure behind them, 131 00:22:23,467 --> 00:22:28,095 what other challenges are in store for our planet's newest recruits? 132 00:22:47,616 --> 00:22:51,494 The rhythm of the seasons is a glorious legacy that we've inherited, 133 00:22:51,661 --> 00:22:55,539 thanks to that all-important tilt of the Earth. 134 00:23:37,332 --> 00:23:39,417 As the seasons parade past, 135 00:23:39,584 --> 00:23:43,337 the same forest will show her spectacular fall colors 136 00:23:43,505 --> 00:23:48,592 and eventually give up her leaves to the snows of winter. 137 00:24:07,362 --> 00:24:11,240 There are parts of the world that have no seasons. 138 00:24:12,367 --> 00:24:13,617 Here in the tropics, 139 00:24:13,785 --> 00:24:18,289 the sun shines for 12 hours a day every day of the year. 140 00:24:18,457 --> 00:24:20,040 [ANIMALS CALLING] 141 00:24:20,208 --> 00:24:22,877 This is what allows the jungle to grow unchecked 142 00:24:23,044 --> 00:24:25,713 and support so much life. 143 00:24:58,163 --> 00:25:02,249 Rain forest now covers just 3 percent of our planet's surface, 144 00:25:02,417 --> 00:25:06,795 but contains more than half of all the plants and animals on Earth. 145 00:25:58,181 --> 00:26:01,892 The rain forests of New Guinea are especially precious. 146 00:26:02,060 --> 00:26:06,146 They are home to 42 different kinds of birds of paradise, 147 00:26:06,314 --> 00:26:09,525 each more exotic than the last. 148 00:26:13,405 --> 00:26:15,322 [WARBLING] 149 00:26:21,663 --> 00:26:24,331 [SQUEAKING] 150 00:26:37,304 --> 00:26:39,513 [CROAKING] 151 00:26:39,681 --> 00:26:42,308 [WARBLING] 152 00:26:51,401 --> 00:26:53,944 This is a particularly rich forest, 153 00:26:54,112 --> 00:26:59,366 so the six-plumed bird of paradise has no problem finding food. 154 00:26:59,534 --> 00:27:02,286 He can concentrate on more important tasks, 155 00:27:02,454 --> 00:27:04,872 like cleaning up for his big date tonight. 156 00:27:07,834 --> 00:27:09,918 He's obsessed with housework. 157 00:27:10,086 --> 00:27:13,714 Everything has to be spick and span before she comes over. 158 00:27:13,882 --> 00:27:16,300 Oh! Missed a spot. 159 00:27:22,223 --> 00:27:24,975 Finally, the stage is set. 160 00:27:25,393 --> 00:27:27,645 Get down, baby. 161 00:27:46,456 --> 00:27:48,791 It's a virtuoso performance, 162 00:27:48,958 --> 00:27:51,835 but, unfortunately, she's a no-show. 163 00:27:52,462 --> 00:27:54,630 [CAWING] 164 00:27:57,008 --> 00:28:00,302 This contender, called the superb bird-of-paradise, 165 00:28:00,470 --> 00:28:03,597 is a magician, with a special trick. 166 00:28:03,765 --> 00:28:08,185 First, he advertises his show by calling to attract a female. 167 00:28:09,020 --> 00:28:15,025 And then, with the audience in place, he begins to work his magic. 168 00:28:29,457 --> 00:28:31,792 Now, that's impressive. 169 00:28:31,960 --> 00:28:34,962 But she needs to step out for a moment to think. 170 00:28:42,679 --> 00:28:45,472 How could a girl resist? 171 00:28:48,476 --> 00:28:51,395 Oh, boy. Well, not today. 172 00:29:01,865 --> 00:29:03,282 These tropical forests 173 00:29:03,450 --> 00:29:07,661 not only enjoy 12 hours of sunshine a day all year long, 174 00:29:07,829 --> 00:29:09,496 they also need lots of rainfall. 175 00:29:22,135 --> 00:29:23,886 But as the weather patterns change, 176 00:29:24,053 --> 00:29:27,973 there are signs that these lush forests are starting to dry up. 177 00:30:05,804 --> 00:30:09,932 Deserts cover one-third of the Earth's land surface. 178 00:30:11,768 --> 00:30:14,228 They're getting bigger every year. 179 00:30:44,843 --> 00:30:48,595 This is a land where only a few can survive, 180 00:30:48,847 --> 00:30:50,931 a special few. 181 00:31:12,537 --> 00:31:17,291 Dry season in the Kalahari Desert of southern Africa. 182 00:31:24,632 --> 00:31:30,429 Thousands of elephants have started on their epic quest for food and water. 183 00:31:34,767 --> 00:31:40,522 The baby elephants stride alongside. It's their first road trip with the family. 184 00:31:43,735 --> 00:31:48,155 The mothers follow the same trails their families have followed for decades. 185 00:31:48,323 --> 00:31:50,324 And all trails lead to one place: 186 00:31:50,867 --> 00:31:52,326 the Okavango, 187 00:31:52,493 --> 00:31:55,996 a vast inland delta in the heart of the desert. 188 00:31:56,164 --> 00:32:00,834 At the moment, it's dry, but water should come. 189 00:32:09,761 --> 00:32:13,722 All across southern Africa, millions of animals are on the move, 190 00:32:13,890 --> 00:32:17,684 on the same life-or-death quest for water. 191 00:32:42,961 --> 00:32:46,171 This tiny calf struggles to keep up with Mom. 192 00:32:46,339 --> 00:32:51,343 It's his first trip, and he has a desperate need for water. 193 00:32:51,970 --> 00:32:53,387 All his mom can do 194 00:32:53,554 --> 00:32:58,809 is encourage him to keep going in the heat and impossible dryness. 195 00:33:10,029 --> 00:33:13,031 A dust storm blows hard across the trail, 196 00:33:13,199 --> 00:33:15,659 making it nearly impossible to see. 197 00:33:20,206 --> 00:33:25,460 The mother and son move slowly and become separated from the herd. 198 00:33:38,558 --> 00:33:40,350 Without the protection of the herd, 199 00:33:40,518 --> 00:33:43,311 the mom and her baby are completely exposed 200 00:33:43,479 --> 00:33:45,439 to the dangers of the wild. 201 00:33:49,777 --> 00:33:53,822 It looks like refuge just a few paces away. 202 00:34:00,955 --> 00:34:03,915 But these dead trees offer no protection, and the herd is already a mile ahead. 203 00:34:03,916 --> 00:34:07,627 But these dead trees offer no protection, and the herd is already a mile ahead. 204 00:34:12,175 --> 00:34:18,597 Mom knows the herd can't afford to stop, so they move as fast as they can. 205 00:34:23,144 --> 00:34:25,854 Finally, they emerge from the dust, 206 00:34:26,022 --> 00:34:28,815 but the herd is nowhere in sight. 207 00:34:38,659 --> 00:34:43,872 Blinded by sand, the calf barely has the strength to go on. 208 00:35:09,982 --> 00:35:13,693 This lone youngster got lost in the dust storm too. 209 00:35:13,861 --> 00:35:18,406 Thirsty and exhausted, he follows the tracks of his mother, 210 00:35:19,617 --> 00:35:22,077 but in the wrong direction. 211 00:35:39,011 --> 00:35:44,391 Where dust and water combine, the march of the deserts is halted. 212 00:35:47,436 --> 00:35:51,565 Sand dunes give way to prairies and savanna. 213 00:35:52,066 --> 00:35:55,569 Grass is the great unsung hero of our planet. 214 00:35:55,736 --> 00:35:57,737 It keeps deserts in check 215 00:35:57,905 --> 00:36:02,742 and provides the stage for many of the greatest spectacles on Earth. 216 00:36:31,230 --> 00:36:33,440 The great game herds of East Africa 217 00:36:33,608 --> 00:36:37,819 all rely on these vast life-giving grasslands. 218 00:36:38,613 --> 00:36:43,116 But where there are herds, there's always someone watching. 219 00:37:07,183 --> 00:37:10,227 Every day on wide open plains the world over, 220 00:37:10,394 --> 00:37:13,313 a timeless ritual plays itself out: 221 00:37:13,481 --> 00:37:17,734 the drama of hunter and hunted. 222 00:38:00,152 --> 00:38:02,112 This is the circle of life 223 00:38:02,280 --> 00:38:07,242 that most of us, in our urban lives, have lost touch with. 224 00:39:54,141 --> 00:39:56,684 They've been on the trail for two weeks now. 225 00:39:57,186 --> 00:40:00,772 The baby elephant and his mom made it back to the herd, 226 00:40:00,940 --> 00:40:04,776 but they're exhausted and desperately thirsty. 227 00:40:13,577 --> 00:40:17,414 The moms lead their herd to a temporary watering hole. 228 00:40:17,581 --> 00:40:20,250 It's not exactly the paradise they were expecting, 229 00:40:20,418 --> 00:40:22,669 but they're only halfway on their journey, 230 00:40:22,837 --> 00:40:27,507 and this place looks safe, at least for tonight. 231 00:40:58,205 --> 00:40:59,539 As the sun sets, 232 00:40:59,707 --> 00:41:02,375 the elephants are forced to share the water with others. 233 00:41:03,502 --> 00:41:06,713 These are fragile alliances. 234 00:41:14,930 --> 00:41:17,223 [GROWLS] 235 00:41:17,391 --> 00:41:19,392 [ELEPHANT TRUMPETS] 236 00:41:24,857 --> 00:41:28,526 By day, the elephants dominate the watering hole. 237 00:41:32,573 --> 00:41:35,909 But by night, the balance of power shifts. 238 00:41:45,836 --> 00:41:48,922 The baby and his mother are most at risk. 239 00:41:49,089 --> 00:41:51,674 They are closer to the lions than they know. 240 00:41:59,475 --> 00:42:03,937 In total darkness, an elephant's vision is no better than our own. 241 00:42:04,313 --> 00:42:07,732 Lions can see easily. 242 00:42:24,583 --> 00:42:28,878 The cats are ravenously hungry, and the elephants know it. 243 00:42:48,899 --> 00:42:51,317 The lions can bide their time. 244 00:42:51,986 --> 00:42:55,196 It's the calves they're after. 245 00:43:04,206 --> 00:43:05,999 [GROWLS] 246 00:43:12,172 --> 00:43:14,424 The pride rallies for an attack. 247 00:43:14,842 --> 00:43:19,178 The elephants herd their young together, forming a protective circle. 248 00:43:25,185 --> 00:43:28,187 The cats pace nervously, looking for an opening. 249 00:43:29,523 --> 00:43:31,691 They're waiting for the call to attack. 250 00:43:40,534 --> 00:43:42,869 [ROARING] 251 00:44:00,679 --> 00:44:02,597 The calves are too well protected. 252 00:44:02,765 --> 00:44:06,976 The lions will have to risk it all and change tactics. 253 00:44:09,229 --> 00:44:12,815 Against this elephant, a solitary lion wouldn't stand a chance. 254 00:44:12,983 --> 00:44:18,988 But the whole pride is here, 30 of them, and they're expert elephant hunters. 255 00:45:03,325 --> 00:45:06,536 Those who survive the night press on. 256 00:45:06,954 --> 00:45:10,164 They're tired and frightened and can only follow their instincts. 257 00:45:20,342 --> 00:45:24,971 The sun that scorches the desert also brings water to the land. 258 00:45:25,139 --> 00:45:27,515 As it beats down on tropical seas, 259 00:45:27,683 --> 00:45:33,479 moisture rises from the warming oceans and fuels the global weather systems. 260 00:46:25,240 --> 00:46:28,409 Moisture-filled clouds from the Indian Ocean 261 00:46:28,577 --> 00:46:31,370 sweep north toward the mountains. 262 00:46:31,538 --> 00:46:37,126 As the air rises, the water cools and falls as snow. 263 00:46:50,057 --> 00:46:55,394 This majestic sight is the backdrop for nature's most challenging migration. 264 00:47:02,069 --> 00:47:03,110 In late summer, 265 00:47:03,278 --> 00:47:07,406 demoiselle cranes have to escape the harsh winters in Mongolia 266 00:47:07,574 --> 00:47:11,410 by flying south to the warmer climates of India. 267 00:47:16,375 --> 00:47:20,753 To get there, they have to cross the highest mountain range on Earth: 268 00:47:21,421 --> 00:47:23,631 the Himalayas. 269 00:47:38,105 --> 00:47:42,859 As the sun heats these great slopes, warm air rises from the valleys. 270 00:47:43,026 --> 00:47:47,947 By late morning, it turns into ferocious winds. 271 00:48:02,421 --> 00:48:06,549 The cranes hit violent turbulence that throws them off course. 272 00:48:07,843 --> 00:48:12,889 They have no choice but to turn back for the night or risk certain death. 273 00:48:31,491 --> 00:48:37,204 As the sun sets, the slopes cool, and the turbulence falls away. 274 00:49:02,022 --> 00:49:04,523 After a long night in the frigid mountain air, 275 00:49:04,691 --> 00:49:07,902 the cranes are ready for their next attempt. 276 00:49:27,422 --> 00:49:31,384 It's early morning, and the warm air is already rising fast. 277 00:49:31,551 --> 00:49:34,053 But this time, the winds are calmer, 278 00:49:34,221 --> 00:49:38,140 and they can use the rising thermals to gain height. 279 00:49:44,815 --> 00:49:48,818 But as the heat rises, the winds lock in again. 280 00:49:48,986 --> 00:49:49,610 They're past the point of no return. 281 00:49:49,611 --> 00:49:52,071 They're past the point of no return. 282 00:49:59,037 --> 00:50:00,621 In the final ascent, 283 00:50:00,789 --> 00:50:04,834 every wing beat is a desperate battle against the freezing wind. 284 00:50:23,103 --> 00:50:25,730 At last, they've made it. 285 00:50:25,897 --> 00:50:29,025 They've conquered the highest peaks on Earth. 286 00:50:29,192 --> 00:50:34,280 On the other side, there's a warm sanctuary for the winter. 287 00:50:51,506 --> 00:50:53,716 The sun melts the snow, 288 00:50:53,884 --> 00:50:59,055 and the waters begin the long journey back to the oceans. 289 00:52:16,716 --> 00:52:20,719 It's the great unending cycle of sunlight and fresh water 290 00:52:20,887 --> 00:52:24,473 that brings life to every corner of the Earth. 291 00:52:42,909 --> 00:52:46,162 For generations, humans and animals alike 292 00:52:46,329 --> 00:52:51,083 have come to depend on the great rivers and their endless flow. 293 00:53:53,521 --> 00:53:54,980 After months of drought, 294 00:53:55,148 --> 00:53:58,359 the buffalo reach the end of their long migration, 295 00:53:58,526 --> 00:54:02,655 and the rivers begin to flow again in the Kalahari. 296 00:54:03,865 --> 00:54:06,158 As waters sweep through desert lands, 297 00:54:06,326 --> 00:54:11,497 the Okavango is transformed into a fertile paradise. 298 00:54:27,722 --> 00:54:30,724 This is an Africa we rarely see, 299 00:54:30,892 --> 00:54:35,354 a lush water world totally reliant on a seasonal flood, 300 00:54:35,522 --> 00:54:40,442 originating from a tropical ocean thousands of miles away. 301 00:55:11,349 --> 00:55:14,727 Most animals feel at home in this life-giving flood, 302 00:55:15,061 --> 00:55:19,982 but some aren't sure what to do with their new beachfront property. 303 00:56:34,307 --> 00:56:37,810 After weeks of marching, the elephants are exhausted 304 00:56:37,977 --> 00:56:41,688 and struggle to stay focused on the road ahead. 305 00:56:53,993 --> 00:56:57,496 Mom is sure she can smell the water in the distance 306 00:56:57,664 --> 00:57:02,209 and encourages everybody to make one last try. 307 00:57:03,586 --> 00:57:06,755 They're just a few days away now. 308 00:57:38,371 --> 00:57:44,042 The seasonal cycle that drives life on land is just as important in the oceans. 309 00:58:16,409 --> 00:58:21,038 [WHALES CALLING] 310 00:58:36,763 --> 00:58:39,848 It's summer, and the humpback whales 311 00:58:40,016 --> 00:58:42,434 are in their breeding grounds in the tropics. 312 00:58:45,188 --> 00:58:47,648 This calf is only a few weeks old, 313 00:58:47,815 --> 00:58:51,443 and, like any newborn, he needs a little help. 314 00:58:53,154 --> 00:58:58,116 His mom holds him up to the surface so he can breathe more easily. 315 00:59:10,171 --> 00:59:13,465 These shallow waters are great for raising kids. 316 00:59:13,633 --> 00:59:17,719 They're warm and calm, with few predators to speak of. 317 00:59:45,832 --> 00:59:50,586 The playful calf is now drinking 150 gallons of milk a day, 318 00:59:50,753 --> 00:59:52,963 but Mom is starving. 319 00:59:53,131 --> 00:59:57,217 In these crystal-clear waters, there's nothing for her to eat. 320 01:00:14,360 --> 01:00:18,447 To find food, she must lead her calf to richer feeding grounds 321 01:00:18,615 --> 01:00:21,700 at the southern extremes of our planet. 322 01:00:24,746 --> 01:00:29,041 It's the longest migration of any marine mammal. 323 01:00:52,523 --> 01:00:57,736 Out in the open ocean, the whales hit rush hour on the high seas. 324 01:01:20,009 --> 01:01:22,844 Dolphins close in on their prey. 325 01:01:31,521 --> 01:01:34,898 A hundred sailfish join in the attack. 326 01:01:46,661 --> 01:01:50,622 Reaching almost 70 miles an hour, they are the cheetahs of the sea world. 327 01:02:20,486 --> 01:02:24,698 The seas are churning now, and the going is slow. 328 01:02:28,745 --> 01:02:32,289 Mom and her calf have to swim south across half the globe 329 01:02:32,457 --> 01:02:36,209 to reach their destination: Antarctica. 330 01:02:37,587 --> 01:02:40,464 The tropics are hundreds of miles behind them 331 01:02:40,631 --> 01:02:43,675 as they head into stormy seas. 332 01:02:48,055 --> 01:02:51,308 Winds and currents pull nutrients from the deep, 333 01:02:51,476 --> 01:02:56,229 and life blooms wherever the rays of the sun can penetrate. 334 01:02:58,191 --> 01:03:03,361 To our whale calf on her first trip, this is all brand-new. 335 01:03:36,145 --> 01:03:38,188 So far, their journey has been safe 336 01:03:38,356 --> 01:03:40,899 and far away from the dangerous predators 337 01:03:41,067 --> 01:03:43,735 who roam the high seas, 338 01:03:44,237 --> 01:03:46,571 at least until now. 339 01:04:03,214 --> 01:04:09,594 The great white shark, the largest predatory fish on the planet. 340 01:06:14,053 --> 01:06:18,598 Late summer in the Arctic, and the ice is melting fast. 341 01:06:33,364 --> 01:06:36,908 Mom and her two cubs have had a hard time on the shifting ice, 342 01:06:37,076 --> 01:06:41,579 and she's forced to lead the hungry cubs back to shore. 343 01:06:50,464 --> 01:06:52,799 Their dad has it even worse. 344 01:06:52,967 --> 01:06:58,388 He's wandered miles from land, and the ice is too thin to support him. 345 01:06:58,556 --> 01:07:01,599 He's in danger of being stranded in the frigid water, 346 01:07:01,767 --> 01:07:06,354 and, if he doesn't act fast, he could be lost at sea. 347 01:07:19,577 --> 01:07:21,870 The glacial runoff pours from the land 348 01:07:22,288 --> 01:07:25,373 to mix with seawater and speed up the thaw. 349 01:07:25,541 --> 01:07:28,460 Time is running out. 350 01:07:42,224 --> 01:07:43,767 The father is starving 351 01:07:43,934 --> 01:07:47,812 and trying everything just to stay upright on the ice. 352 01:07:55,988 --> 01:07:59,532 [ROARING] 353 01:08:09,502 --> 01:08:15,340 Each year, as our planet warms, there is less and less ice in the Arctic. 354 01:08:15,674 --> 01:08:18,176 It's a disaster for polar bears. 355 01:08:18,344 --> 01:08:22,764 Without a hunting platform, he'll struggle to survive. 356 01:08:32,608 --> 01:08:37,612 Mom and her calf forge ahead through treacherous seas. 357 01:08:38,197 --> 01:08:41,157 They're nearly 3,000 miles from the tropics now, 358 01:08:41,325 --> 01:08:43,868 and the winds are blowing hard. 359 01:08:53,420 --> 01:08:55,922 The calf and her mom slap their fins on the water 360 01:08:56,090 --> 01:08:59,008 to stay in close contact with each other. 361 01:09:15,025 --> 01:09:18,194 The calf can hear her mom above the roar of the ocean. 362 01:09:18,362 --> 01:09:21,406 It keeps her calm and on course during the storm. 363 01:09:41,385 --> 01:09:45,430 The frozen beauty of the Southern Ocean. 364 01:10:06,785 --> 01:10:09,829 It's October, and here in the southern hemisphere 365 01:10:09,997 --> 01:10:14,250 that means summer is on its way, and life returns. 366 01:10:16,712 --> 01:10:22,175 Adélie penguins, and they're in a hurry to reach their nesting grounds. 367 01:10:23,219 --> 01:10:24,636 You may not know this, 368 01:10:24,803 --> 01:10:29,224 but they're one of the few animals with a built-in toboggan. 369 01:10:37,441 --> 01:10:40,193 [BLEATING] 370 01:10:51,997 --> 01:10:53,122 December, 371 01:10:53,290 --> 01:10:56,000 and here in the southern extremes of our planet, 372 01:10:56,168 --> 01:10:58,628 the sun does not set. 373 01:11:01,840 --> 01:11:04,133 The Antarctic summer is short, 374 01:11:04,301 --> 01:11:11,182 but, for a few brief moments, the sun's warmth unlocks frozen bays. 375 01:11:25,906 --> 01:11:29,575 In the depths, something stirs. 376 01:11:49,221 --> 01:11:50,555 They've made it. 377 01:11:50,848 --> 01:11:54,934 At last, after a 4,000-mile journey, 378 01:11:55,102 --> 01:12:00,940 our calf and her mom have arrived, joined by their friends. 379 01:12:12,077 --> 01:12:16,080 They celebrate by dining on their favorite food, krill, 380 01:12:16,248 --> 01:12:20,460 shrimp that begin to swarm here as soon as the ice retreats. 381 01:12:26,091 --> 01:12:29,927 Mom and her calf can finally eat their fill. 382 01:12:39,730 --> 01:12:41,439 The whales use a fishing technique 383 01:12:41,607 --> 01:12:44,275 that's been handed down through generations. 384 01:12:44,860 --> 01:12:47,028 They blow bubbles while swimming in circles 385 01:12:47,196 --> 01:12:48,654 to create a bubble net. 386 01:12:48,822 --> 01:12:52,283 The net encircles the krill and pulls them in. 387 01:12:52,701 --> 01:12:54,952 Then the whales swim up through the bubble net, 388 01:12:55,120 --> 01:12:59,040 swallowing thousands of krill in one gulp. 389 01:13:17,810 --> 01:13:23,981 In a few months, the summer will fade, and it'll be time for the long swim home. 390 01:13:30,280 --> 01:13:32,240 Winter in Antarctica, 391 01:13:32,408 --> 01:13:36,702 and the greatest seasonal change on our planet is under way. 392 01:14:04,398 --> 01:14:06,524 The sun begins to retreat, 393 01:14:06,692 --> 01:14:11,070 and soon the continent will be plunged back into darkness. 394 01:14:15,075 --> 01:14:18,619 And the penguins? Well, don't feel sorry for them. 395 01:14:18,787 --> 01:14:22,748 They have front-row seats for the most amazing light show on Earth: 396 01:14:23,167 --> 01:14:25,877 The aurora australis. 397 01:15:08,378 --> 01:15:12,507 In the north of our planet, back where our story began, 398 01:15:13,050 --> 01:15:16,260 the sea ice is almost gone. 399 01:15:21,433 --> 01:15:25,937 It's the cubs' dad, and he is in desperate trouble. 400 01:15:43,747 --> 01:15:46,040 Hunger has driven him far out to sea 401 01:15:46,208 --> 01:15:50,628 to search for seals among the remaining fragments of ice. 402 01:16:00,973 --> 01:16:05,309 He seems at home in the water, but he's exhausted. 403 01:16:06,645 --> 01:16:10,106 If he doesn't find land soon in this vast ocean, 404 01:16:10,274 --> 01:16:12,275 he will drown. 405 01:16:49,187 --> 01:16:52,356 [SNORTING] 406 01:17:14,546 --> 01:17:18,966 After many days at sea, the exhausted bear pulls up on shore 407 01:17:19,134 --> 01:17:22,345 at this pungent public beach. 408 01:17:32,272 --> 01:17:36,817 He's lost half his body weight and now is desperate for food. 409 01:17:36,985 --> 01:17:40,905 But a walrus is much larger than his usual prey. 410 01:17:46,536 --> 01:17:48,371 It's the pups he'll have to get to, 411 01:17:48,538 --> 01:17:53,459 but the powerful adults can inflict fatal damage with their tusks. 412 01:18:32,040 --> 01:18:36,585 The walrus sense danger and close ranks around their young. 413 01:18:43,844 --> 01:18:47,138 He tests the barrier, but it stands firm. 414 01:18:51,685 --> 01:18:53,936 He may be the world's biggest land carnivore, 415 01:18:54,104 --> 01:18:55,604 but he's met his match here, 416 01:18:55,772 --> 01:18:59,358 and he's clearly weakened by his ordeal at sea. 417 01:19:07,159 --> 01:19:10,327 A pup tries to hide behind her mother. 418 01:19:12,831 --> 01:19:15,499 If he can just pry her off. 419 01:19:40,901 --> 01:19:45,654 Now the herd is fleeing to the water, and there's no time left. 420 01:19:59,544 --> 01:20:04,048 He tries again and again, in sheer frustration. 421 01:20:31,326 --> 01:20:36,080 Their tusks strike like knives, and he must avoid them at all cost. 422 01:20:43,797 --> 01:20:45,464 The walrus flee on all sides, 423 01:20:45,632 --> 01:20:48,092 forcing him to a choice he didn't want to take: 424 01:20:48,468 --> 01:20:50,886 to attack in the water. 425 01:20:59,521 --> 01:21:02,773 But it slips from his weakened grasp. 426 01:21:39,728 --> 01:21:42,813 He gambled and lost. 427 01:21:44,858 --> 01:21:47,443 He would never have attacked such dangerous prey 428 01:21:47,611 --> 01:21:50,195 had he not been so starved and desperate. 429 01:21:59,998 --> 01:22:02,625 The walrus are calm again. 430 01:22:02,792 --> 01:22:04,418 The bear is no longer a threat. 431 01:22:12,260 --> 01:22:17,348 But unable to feed, the cubs' father cannot survive. 432 01:22:56,304 --> 01:23:02,059 Wind and rain and fire and ice have come and gone. 433 01:23:03,144 --> 01:23:07,398 A year has passed, and the cubs are old enough to be on their own. 434 01:23:07,565 --> 01:23:11,318 They've left their mother and are thriving. 435 01:23:31,589 --> 01:23:36,760 Their father's brave spirit will always live on in their young hearts. 436 01:23:36,928 --> 01:23:40,973 Like all of our children, they are the hope of the future 437 01:23:41,141 --> 01:23:46,311 and proof of the resilience of life in this place we all share. 438 01:23:46,479 --> 01:23:49,231 Yes, it's full of harsh realities, 439 01:23:49,399 --> 01:23:53,944 but sometimes it's just paradise. 440 01:24:17,635 --> 01:24:19,803 [TRUMPETS] 441 01:25:14,526 --> 01:25:15,609 [CHIRPING] 442 01:25:51,104 --> 01:25:54,314 I've never been in anything like this before, 443 01:25:55,108 --> 01:25:57,734 and, of course, I'm slightly nervous of it. 444 01:25:57,902 --> 01:26:02,072 Partly because it's basically a deck chair with a balloon on top, 445 01:26:02,240 --> 01:26:05,617 and partly because I can see where my head's gonna be. 446 01:26:05,785 --> 01:26:07,619 It's gonna be incredibly close to that burner. 447 01:26:10,373 --> 01:26:11,748 I do have a fear of heights. 448 01:26:11,916 --> 01:26:15,711 I mostly have a fear of falling through them onto the ground. 449 01:26:16,171 --> 01:26:19,840 But I think I'm happy with this. It's got a little seatbelt and everything. 450 01:26:24,804 --> 01:26:25,846 Set for takeoff. 451 01:26:26,014 --> 01:26:27,890 [SPEAKING IN FOREIGN LANGUAGE] 452 01:26:36,024 --> 01:26:37,983 [LAUGHING] 453 01:26:40,153 --> 01:26:42,446 Oh, finally, they're off. 454 01:26:44,073 --> 01:26:45,282 MAN 1: Yeah? 455 01:26:45,450 --> 01:26:47,618 MAN 2: Say when. MAN 1: Pan. 456 01:26:56,920 --> 01:26:59,129 Keep it locked. I'll just go check the window. 457 01:26:59,297 --> 01:27:00,631 MAN 1: Hang on. He's coming back that way. 458 01:27:00,798 --> 01:27:05,510 This is just a bit of a problem when we get bears as close as this to the cabin. 459 01:27:06,679 --> 01:27:07,971 MAN 1: Day one. 460 01:27:08,139 --> 01:27:09,681 MAN 2: Day one. 461 01:27:09,849 --> 01:27:12,059 A bear outside the cabin. 462 01:27:12,435 --> 01:27:13,977 MAN 1: Oh, hang on. 463 01:27:19,359 --> 01:27:21,985 Polar bear at 11 o'clock. 464 01:27:22,153 --> 01:27:23,654 - There he is. Keep going. MAN 1: I got him. 465 01:27:23,821 --> 01:27:25,155 MAN 2: They got him. 466 01:27:26,241 --> 01:27:27,950 Big old bear. 467 01:27:28,117 --> 01:27:30,661 - He's awesome. - That's fantastic. 468 01:27:33,915 --> 01:27:35,499 Stop. 469 01:27:41,047 --> 01:27:42,756 MAN: She's gonna go. She's coming in now. 470 01:27:43,216 --> 01:27:45,259 Nice start. 471 01:27:46,928 --> 01:27:49,763 Yes, here, here, here. That's pin sharp. 472 01:27:52,517 --> 01:27:53,684 WOMAN: Right here. MAN: Yeah. 473 01:27:53,851 --> 01:27:56,061 WOMAN: There's a lion right next to the door. 474 01:27:57,355 --> 01:27:58,563 Very nice lions out here. 475 01:27:58,731 --> 01:28:00,691 [LION ROARING] 476 01:28:02,860 --> 01:28:05,570 MAN 1: Now, this is a lot harder than I thought it was on the first day. 477 01:28:05,738 --> 01:28:07,531 Michael, 9 o'clock? 478 01:28:07,865 --> 01:28:09,032 Just off to left. Pan left. 479 01:28:09,534 --> 01:28:12,327 And left. And all right, you've got it bang in the middle of the frame. 480 01:28:12,495 --> 01:28:13,912 Good. Phew. 481 01:28:14,080 --> 01:28:15,998 - Just in time. MAN 2: All right. 482 01:28:19,294 --> 01:28:21,878 [WHALES CALLING] 483 01:28:37,228 --> 01:28:40,063 The port side. It's gonna come back to you at 7 o'clock. 484 01:28:41,190 --> 01:28:43,984 Whoa, unbelievable. 485 01:28:44,152 --> 01:28:45,736 - Got it? MAN: Yes. 486 01:28:45,903 --> 01:28:48,030 That should be on. 487 01:28:58,416 --> 01:29:00,709 Ohhh.... Ohh! 488 01:29:02,462 --> 01:29:05,047 [BRANCHES CRACKING] 489 01:29:18,686 --> 01:29:20,103 MAN: I go down. Sorry. 490 01:29:25,693 --> 01:29:28,111 Stupid. I'm stupid. 491 01:29:30,448 --> 01:29:32,407 - You okay? - Yeah, just-- 492 01:29:32,575 --> 01:29:34,284 MAN: Captain for me? - Yeah, I think so. 493 01:29:34,452 --> 01:29:36,536 - Leg okay? - Just minor flesh wounds. 41032

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