1 00:00:01,680 --> 00:00:03,320 Viewers like you make this program possible. 2 00:00:03,440 --> 00:00:05,440 Support your local PBS station. 3 00:00:08,640 --> 00:00:11,039 They travel hundreds of miles 4 00:00:11,040 --> 00:00:14,479 on paths carved by their ancestors. 5 00:00:14,480 --> 00:00:17,079 They carry irreplaceable knowledge, 6 00:00:17,080 --> 00:00:19,720 and they embody a world of contradictions. 7 00:00:21,320 --> 00:00:27,359 Breathtaking power and remarkable sensitivity. 8 00:00:27,360 --> 00:00:31,679 With tusks each weighing over 100 pounds, 9 00:00:31,680 --> 00:00:33,879 these special males have 10 00:00:33,880 --> 00:00:37,120 been nearly obliterated by human greed. 11 00:00:38,160 --> 00:00:43,879 Fewer than 30 of these super tuskers remain in all of Kenya. 12 00:00:46,040 --> 00:00:52,119 Three magnificent tuskers, each on his own path, 13 00:00:52,120 --> 00:00:56,319 carry us into a world rarely glimpsed. 14 00:00:56,320 --> 00:00:58,119 Highly social, 15 00:00:58,120 --> 00:00:59,640 even affectionate. 16 00:01:02,040 --> 00:01:05,320 Their alliances run deep. 17 00:01:07,040 --> 00:01:10,359 This is a brotherhood. 18 00:01:47,320 --> 00:01:54,279 These tusks bear 34 million years of evolution. 19 00:02:02,720 --> 00:02:06,760 And etched into them is a lifetime. 20 00:02:09,680 --> 00:02:11,919 For over half a century, 21 00:02:11,920 --> 00:02:14,719 this elephant, known as Craig, 22 00:02:14,720 --> 00:02:17,959 has followed the tracks of his ancestors. 23 00:02:29,080 --> 00:02:32,920 Tasks that reach the ground are rare, 24 00:02:33,040 --> 00:02:37,080 but Craig is far more valuable than the ivory he carries. 25 00:02:38,360 --> 00:02:41,919 He is a keeper of knowledge. 26 00:02:41,920 --> 00:02:46,040 He knows the migratory routes carved by generations. 27 00:02:47,440 --> 00:02:52,040 He knows where to find food and water when the land is parched. 28 00:02:55,040 --> 00:03:00,280 Tuskers like Craig are guardians of an ancient lineage. 29 00:03:05,520 --> 00:03:11,759 This wise old tusker has just survived a deadly drought. 30 00:03:11,760 --> 00:03:15,120 And now Kenya is green again. 31 00:03:34,840 --> 00:03:38,720 Elephants are pouring in from miles around. 32 00:03:45,960 --> 00:03:50,760 Families are gathering on the open plains of Amboseli. 33 00:03:53,720 --> 00:03:55,959 In this time of abundance, 34 00:03:55,960 --> 00:03:59,920 elephants can reunite and renew their social ties. 35 00:04:14,240 --> 00:04:17,639 The grasslands are flush with life 36 00:04:17,640 --> 00:04:20,039 and scattered reminders of those 37 00:04:20,040 --> 00:04:24,519 who couldn't hold on until the rains arrived. 38 00:04:24,520 --> 00:04:27,720 No species escaped. 39 00:04:27,840 --> 00:04:30,520 Mothers lost young. 40 00:04:30,640 --> 00:04:32,640 Families lost matriarchs. 41 00:04:34,960 --> 00:04:37,039 For those who survived, 42 00:04:37,040 --> 00:04:41,639 this moment of celebration holds the promise of new life. 43 00:04:45,920 --> 00:04:49,440 The springs and water holes are full. 44 00:04:52,080 --> 00:04:55,559 For this immense gathering of the matriarchy, 45 00:04:55,560 --> 00:04:58,359 it's a time of pure joy. 46 00:05:32,640 --> 00:05:35,879 The matriarchies, where their sisters and daughters 47 00:05:35,880 --> 00:05:41,719 and young sons are the cornerstone of elephant society. 48 00:05:41,720 --> 00:05:45,359 But they are only part of the story. 49 00:05:45,360 --> 00:05:50,439 The rest are miles away and well aware of the gathering. 50 00:05:55,720 --> 00:05:59,959 Elephant rumbles vibrate through the air and ground, 51 00:05:59,960 --> 00:06:02,440 carrying messages from afar. 52 00:06:07,080 --> 00:06:10,679 Esau traveled through the night. 53 00:06:10,680 --> 00:06:16,439 At 33, this magnificent tusker is not yet fully grown, 54 00:06:16,440 --> 00:06:21,919 but already His tusks nearly touch the ground. 55 00:06:21,920 --> 00:06:26,639 They're a genetic gift from his parents. 56 00:06:26,640 --> 00:06:29,679 He was born here in Amboseli, 57 00:06:29,680 --> 00:06:33,120 but he's here now for only one reason. 58 00:06:33,240 --> 00:06:35,520 He is ready to mate. 59 00:06:38,880 --> 00:06:42,479 Esau is just entering his breeding prime, 60 00:06:42,480 --> 00:06:45,519 and his hormones are raging. 61 00:06:45,520 --> 00:06:49,839 He is in must, a heightened sexual state. 62 00:06:55,080 --> 00:06:58,520 Testosterone is surging through his system. 63 00:07:00,160 --> 00:07:03,319 Pheromones stream from his swollen glands, 64 00:07:03,320 --> 00:07:06,920 and he leaves a scent trail of pungent urine. 65 00:07:09,040 --> 00:07:11,159 As impressive as he is, 66 00:07:11,160 --> 00:07:13,720 it's still years before he'll reach his peak 67 00:07:13,840 --> 00:07:15,720 as a breeding male. 68 00:07:18,760 --> 00:07:24,840 While Esau broadcasts his status, he listens for others. 69 00:07:27,440 --> 00:07:29,319 Through sound and scent, 70 00:07:29,320 --> 00:07:32,920 he's aware of a much larger male to the west. 71 00:07:36,520 --> 00:07:38,919 On the far boundary of the park, 72 00:07:38,920 --> 00:07:41,519 another tusker is in must. 73 00:07:44,960 --> 00:07:49,320 At 44, Pascal is in his breeding prime. 74 00:07:50,760 --> 00:07:52,919 He is massive, 75 00:07:52,920 --> 00:07:57,839 built like a tank with hulking shoulders and stout tusks. 76 00:08:06,120 --> 00:08:09,679 His right ear was damaged in a long ago battle, 77 00:08:09,680 --> 00:08:11,359 or so it's believed. 78 00:08:16,640 --> 00:08:19,479 He's been in Amboseli for the past month 79 00:08:19,480 --> 00:08:22,119 searching for females ready to mate. 80 00:08:29,360 --> 00:08:34,759 He's a highly successful male, a favorite among the females. 81 00:08:36,480 --> 00:08:40,719 Few males would dare challenge Pascal when he's in must. 82 00:08:46,640 --> 00:08:49,840 Pascal is at his peak. 83 00:08:53,480 --> 00:08:57,279 Miles away, Esau will continue to monitor 84 00:08:57,280 --> 00:09:00,240 and keep a safe distance from Pascal. 85 00:09:02,560 --> 00:09:07,559 Key to Esau's survival is knowing his strength. 86 00:09:07,560 --> 00:09:10,279 He must pick his battles carefully, 87 00:09:10,280 --> 00:09:13,119 because on this playing field, 88 00:09:13,120 --> 00:09:18,160 other males are also in must, and they're looking for mates. 89 00:09:20,280 --> 00:09:22,919 They're listening. 90 00:09:22,920 --> 00:09:25,639 They're searching for scent. 91 00:09:25,640 --> 00:09:29,719 And they're pumped with testosterone. 92 00:09:41,440 --> 00:09:43,439 At every moment, 93 00:09:43,440 --> 00:09:48,040 stories are playing out all across the plains of Amboseli. 94 00:09:49,840 --> 00:09:55,159 This labyrinth of swamps and savanna is a haven for wildlife. 95 00:10:11,040 --> 00:10:14,719 The swamplands of Amboseli are fed by the waters 96 00:10:14,720 --> 00:10:17,119 from Mount Kilimanjaro. 97 00:10:17,120 --> 00:10:22,879 Africa's tallest peak sits just across the border in Tanzania. 98 00:10:22,880 --> 00:10:27,039 This vast ecosystem contains Amboseli National Park 99 00:10:27,040 --> 00:10:32,439 at its heart, but it spans over 3,000 square miles, 100 00:10:32,440 --> 00:10:35,280 reaching across Kenya's border. 101 00:10:37,640 --> 00:10:41,040 Elephants depend on this entire ecosystem. 102 00:10:43,040 --> 00:10:47,480 Grasslands alone aren't enough to sustain bulls like Esau. 103 00:10:48,880 --> 00:10:52,680 They need woodlands to support their massive bodies. 104 00:10:55,320 --> 00:10:58,519 To find them, they travel well-worn paths 105 00:10:58,520 --> 00:11:02,959 that often lead beyond protected areas. 106 00:11:02,960 --> 00:11:07,360 And sometimes those paths cross invisible boundaries. 107 00:11:09,040 --> 00:11:11,720 Just across the border, in Tanzania, 108 00:11:11,840 --> 00:11:14,440 trophy hunting is legal. 109 00:11:19,920 --> 00:11:22,319 With his hyper sense of smell, 110 00:11:22,320 --> 00:11:25,119 Esau is following the scent trail of a family 111 00:11:25,120 --> 00:11:27,160 with several females. 112 00:11:38,480 --> 00:11:42,319 He'll check to see if any of the females are in estrus, 113 00:11:42,320 --> 00:11:45,479 a time when they're receptive to mating. 114 00:11:45,480 --> 00:11:48,959 This one has a youngster in tow. 115 00:11:48,960 --> 00:11:51,159 Kibo is 4 years old. 116 00:11:51,160 --> 00:11:53,960 He'll study Esau's every move. 117 00:12:01,280 --> 00:12:07,159 Females have only a two-day window of peak fertility. 118 00:12:07,160 --> 00:12:09,319 She allows him to test her, 119 00:12:09,320 --> 00:12:12,320 and Kibo moves in to catch the scent. 120 00:12:18,480 --> 00:12:22,679 Esau allows Kibo to move even closer. 121 00:12:22,680 --> 00:12:25,719 This is how young males learn. 122 00:12:25,720 --> 00:12:28,120 This is how Esau learned. 123 00:12:36,880 --> 00:12:38,320 Despite his size, 124 00:12:38,440 --> 00:12:41,360 Esau is extremely patient with the youngsters. 125 00:12:42,640 --> 00:12:45,640 But he's not so tolerant of a nearby bull. 126 00:12:46,880 --> 00:12:50,720 It's the must manifesto to maintain supremacy. 127 00:13:02,440 --> 00:13:05,359 Esau's performance has inspired the boys. 128 00:13:10,640 --> 00:13:14,239 Even at this age, they're hard-wired males, 129 00:13:14,240 --> 00:13:18,320 full of bravado and bluster. 130 00:13:18,440 --> 00:13:20,920 These boys are building alliances 131 00:13:21,040 --> 00:13:23,920 that will serve them on their journey ahead. 132 00:13:27,080 --> 00:13:31,720 Like Esau, they will face a gauntlet of tests. 133 00:13:33,440 --> 00:13:37,359 Searching for females while fending off males, 134 00:13:37,360 --> 00:13:40,559 holding their place in the hierarchy, 135 00:13:40,560 --> 00:13:43,319 all while simply surviving. 136 00:13:49,160 --> 00:13:54,079 Miles away, Pascal is also searching for receptive females, 137 00:13:54,080 --> 00:13:59,839 but in this vast landscape, they are few and far between. 138 00:13:59,840 --> 00:14:03,439 He won't bother checking this young mother. 139 00:14:03,440 --> 00:14:07,079 She won't come into estrus for a year or two, 140 00:14:07,080 --> 00:14:10,120 if her calf survives. 141 00:14:10,240 --> 00:14:12,759 The odds are tough for male calves. 142 00:14:12,760 --> 00:14:17,239 1 in 10 won't make it through their first year. 143 00:14:17,240 --> 00:14:20,520 Males grow faster and need more milk. 144 00:14:23,440 --> 00:14:27,240 In times of scarcity, many don't survive. 145 00:14:29,920 --> 00:14:35,679 Males who make it to 44, like Pascal, are rare and precious, 146 00:14:35,680 --> 00:14:38,559 not only for their genes. 147 00:14:38,560 --> 00:14:40,720 The presence of an older male, 148 00:14:40,840 --> 00:14:44,520 no matter how brief, is invaluable. 149 00:14:44,640 --> 00:14:48,119 Pascal can teach these boys what their mothers can't. 150 00:14:55,720 --> 00:15:00,120 Play fighting is key to male development. 151 00:15:00,240 --> 00:15:03,919 These boys are forming their future peer group. 152 00:15:03,920 --> 00:15:07,319 It's a time to socialize and bond. 153 00:15:18,480 --> 00:15:21,160 They challenge and test their strength. 154 00:15:27,720 --> 00:15:29,759 Sizing up their opponents, 155 00:15:29,760 --> 00:15:32,880 they sharpen their skills for the battles ahead. 156 00:15:35,240 --> 00:15:37,959 But elephant girls are different, 157 00:15:37,960 --> 00:15:39,840 even as infants. 158 00:15:42,040 --> 00:15:43,759 She'll join in the game, 159 00:15:43,760 --> 00:15:46,639 but only for a moment. 160 00:15:46,640 --> 00:15:48,519 Then it's back to mom. 161 00:16:02,040 --> 00:16:04,320 It will be years before these teenagers 162 00:16:04,440 --> 00:16:07,120 experience their first must. 163 00:16:07,240 --> 00:16:10,160 For now, it's still just a game. 164 00:16:18,040 --> 00:16:20,479 On the eastern boundary of the park, 165 00:16:20,480 --> 00:16:24,559 Craig, one of Amboceli's oldest and most revered males, 166 00:16:24,560 --> 00:16:27,240 is taking advantage of the grasses. 167 00:16:29,040 --> 00:16:31,520 He's still thin from the recent drought, 168 00:16:31,640 --> 00:16:35,160 but he's been putting on weight since the rains arrived. 169 00:16:36,960 --> 00:16:40,679 Craig is considered a super tusker, 170 00:16:40,680 --> 00:16:46,520 a rare giant whose tusks each weigh more than 100 pounds. 171 00:16:46,640 --> 00:16:50,160 He's one of fewer than 30 in all of Kenya. 172 00:16:53,880 --> 00:16:55,720 Like other tuskers, 173 00:16:55,840 --> 00:17:00,240 Craig uses his ivory for protection and to access food. 174 00:17:02,720 --> 00:17:06,159 What should be an asset became a liability 175 00:17:06,160 --> 00:17:07,720 when hunters and poachers 176 00:17:07,840 --> 00:17:10,840 targeted bulls with the largest tusks. 177 00:17:13,480 --> 00:17:17,560 Amboseli National Park offered a safe haven. 178 00:17:20,160 --> 00:17:23,359 It continues to be a rare stronghold 179 00:17:23,360 --> 00:17:27,480 where super tuskers like Craig can still exist. 180 00:17:29,760 --> 00:17:32,519 Craig is a living legend, 181 00:17:32,520 --> 00:17:36,439 as is every tusker following in his footsteps. 182 00:17:42,880 --> 00:17:45,679 On the salt flats by Lake Amboseli, 183 00:17:45,680 --> 00:17:49,320 another tusker has fulfilled his mission. 184 00:17:51,840 --> 00:17:55,919 Pascal is following a female with a crooked tail. 185 00:17:55,920 --> 00:17:58,319 She's at the peak of estrus, 186 00:17:58,320 --> 00:18:02,120 and they've been mating for the past two days. 187 00:18:02,240 --> 00:18:05,840 But opportunistic males are circling. 188 00:18:09,080 --> 00:18:11,759 Pascal guards her from behind. 189 00:18:11,760 --> 00:18:14,079 Until she falls out of estrus, 190 00:18:14,080 --> 00:18:16,480 he'll keep the other males at bay. 191 00:18:18,320 --> 00:18:22,159 Pascal's mere presence is so intimidating, 192 00:18:22,160 --> 00:18:27,039 a subtle gesture or a must rumble is often all it takes. 193 00:18:38,080 --> 00:18:42,559 But even the highest ranking males do need to be cautious. 194 00:18:42,560 --> 00:18:46,039 Pascal's must cycle is coming to an end. 195 00:18:46,040 --> 00:18:48,520 A younger male at the peak of must 196 00:18:48,640 --> 00:18:51,520 could soon challenge him and win. 197 00:19:04,440 --> 00:19:07,920 Esau has caught wind of a competitor to the south. 198 00:19:09,080 --> 00:19:13,639 Even from a distance, he can read the scent. 199 00:19:13,640 --> 00:19:16,480 The other male is also in must. 200 00:19:17,440 --> 00:19:21,120 Esau listens for further clues. 201 00:19:30,160 --> 00:19:33,439 Adult males never take fighting lightly. 202 00:19:33,440 --> 00:19:36,960 It can lead to injury or even death. 203 00:19:39,360 --> 00:19:44,960 It's crucial to size up your opponent to calculate the risk. 204 00:19:47,360 --> 00:19:52,039 As they approach, they assess. 205 00:19:52,040 --> 00:19:56,159 The other male has a similar build, shorter tusks, 206 00:19:56,160 --> 00:19:58,519 but in good condition. 207 00:20:09,320 --> 00:20:13,439 If neither retreats, there will be a fight. 208 00:20:46,440 --> 00:20:50,760 Esau claims victory and the loser retreats. 209 00:20:56,320 --> 00:20:58,160 Esau trails him. 210 00:21:02,360 --> 00:21:05,919 A most amazing thing has happened. 211 00:21:05,920 --> 00:21:09,920 Esau has forced the loser out of must. 212 00:21:10,040 --> 00:21:13,040 It just shut off, like a faucet. 213 00:21:15,440 --> 00:21:17,680 He's become submissive. 214 00:21:27,680 --> 00:21:30,879 To be certain, Esau tests the defeated 215 00:21:30,880 --> 00:21:32,960 for signs of testosterone. 216 00:21:38,480 --> 00:21:42,039 Satisfied, he allows the loser to retreat. 217 00:21:54,640 --> 00:21:57,960 There's now one less male to contend with. 218 00:22:03,360 --> 00:22:05,879 To make sure there was no damage, 219 00:22:05,880 --> 00:22:08,560 Esau checks his precious tusks. 220 00:22:31,760 --> 00:22:34,279 Amidst the dramas of Amboseli, 221 00:22:34,280 --> 00:22:39,240 one ancient being stands tall against the horizon. 222 00:22:55,680 --> 00:22:57,920 For nearly 500 years, 223 00:22:58,040 --> 00:23:02,320 she has borne witness to life's ebbs and flows. 224 00:23:04,040 --> 00:23:08,159 She is home, shelter, shade, 225 00:23:08,160 --> 00:23:10,120 even sustenance. 226 00:23:12,520 --> 00:23:16,880 Creatures of the night find calm within her thorns. 227 00:23:36,320 --> 00:23:41,959 Her trunk is worn smooth by generations of elephants. 228 00:23:41,960 --> 00:23:49,119 They leave, sent messages for others on and all around her. 229 00:23:49,120 --> 00:23:53,840 She is a hub of information and opportunity. 230 00:23:59,440 --> 00:24:03,239 There's an order in this natural world. 231 00:24:03,240 --> 00:24:08,520 It is full of unlikely alliances and hidden possibilities. 232 00:24:17,080 --> 00:24:18,959 For hundreds of years, 233 00:24:18,960 --> 00:24:22,959 this ancient acacia has witnessed Amboceli's dramas, 234 00:24:22,960 --> 00:24:25,119 large and small, 235 00:24:25,120 --> 00:24:30,159 and the constant tide of elephants as they come and go. 236 00:24:38,040 --> 00:24:40,439 Pascal is leaving the park. 237 00:24:47,880 --> 00:24:50,039 Despite his heft, 238 00:24:50,040 --> 00:24:54,559 he carefully avoids disturbing the bones of another creature. 239 00:25:01,080 --> 00:25:06,919 Elephants display a remarkable respect for both life and death. 240 00:25:12,960 --> 00:25:16,039 With must behind him for another year, 241 00:25:16,040 --> 00:25:18,719 he heads east, on a journey 242 00:25:18,720 --> 00:25:21,919 that will take him from the safety of Amboseli 243 00:25:21,920 --> 00:25:25,680 into a landscape that is rapidly changing. 244 00:25:29,480 --> 00:25:33,720 Land is being reshaped by human hands. 245 00:25:33,840 --> 00:25:39,759 What once belonged to wildlife is falling prey to the plow. 246 00:25:39,760 --> 00:25:44,320 Highways are carved across age-old elephant paths. 247 00:25:59,960 --> 00:26:05,159 Elephants are intelligent and adaptable, 248 00:26:05,160 --> 00:26:07,920 but change is coming quickly. 249 00:26:18,640 --> 00:26:20,759 20 years ago, 250 00:26:20,760 --> 00:26:25,720 this town was little more than a cluster of Maasai homesteads. 251 00:26:25,840 --> 00:26:28,439 As it grows, it eats into land 252 00:26:28,440 --> 00:26:31,320 where Pascal's ancestors once roamed. 253 00:26:35,640 --> 00:26:38,879 Within this rising sea of human development 254 00:26:38,880 --> 00:26:41,359 is a fertile patch of land, 255 00:26:41,360 --> 00:26:46,919 a small but vital sanctuary called Kimana. 256 00:26:46,920 --> 00:26:50,520 As long as the elephants stay within this conservancy, 257 00:26:50,640 --> 00:26:52,040 they are safe. 258 00:26:54,640 --> 00:26:58,480 Pascal has returned to this small oasis. 259 00:27:01,160 --> 00:27:02,920 No longer in must, 260 00:27:03,040 --> 00:27:05,920 his demeanor has changed dramatically. 261 00:27:11,880 --> 00:27:15,320 Pascal is a highly social being, 262 00:27:15,440 --> 00:27:19,359 and he's come to convene with friends, 263 00:27:19,360 --> 00:27:21,240 all of them males. 264 00:27:31,120 --> 00:27:32,879 If they were in must, 265 00:27:32,880 --> 00:27:34,919 these males would avoid one another 266 00:27:34,920 --> 00:27:39,239 or possibly engage in battle. 267 00:27:39,240 --> 00:27:44,520 But now they're tolerant, even affectionate. 268 00:27:48,360 --> 00:27:52,840 These connections run deep, some of them since childhood. 269 00:27:54,560 --> 00:27:57,520 They confirm their friendship through rumbles 270 00:27:57,640 --> 00:28:00,479 and touch and subtle gestures. 271 00:28:00,480 --> 00:28:06,720 A glance. The flap of an ear. The twist of a trunk. 272 00:28:06,840 --> 00:28:09,520 They've even taken in a young orphan. 273 00:28:11,880 --> 00:28:16,479 8-year-old Theo recently lost his mother in the drought. 274 00:28:16,480 --> 00:28:19,439 By mentoring and watching over him, 275 00:28:19,440 --> 00:28:22,839 this bachelor group has become his family. 276 00:29:15,520 --> 00:29:21,360 They move as a group, a brotherhood 60 tons strong. 277 00:29:26,240 --> 00:29:29,239 Just beyond this small fever tree forest 278 00:29:29,240 --> 00:29:32,240 lies land that was once wild. 279 00:29:34,640 --> 00:29:37,440 It's now a tomato plantation. 280 00:29:39,560 --> 00:29:41,839 With the encroachment of humans, 281 00:29:41,840 --> 00:29:44,879 the elephants are learning to adapt. 282 00:29:44,880 --> 00:29:48,159 The elders are teaching the younger males, like Theo, 283 00:29:48,160 --> 00:29:53,359 how to survive in this shrinking landscape. 284 00:29:53,360 --> 00:29:56,519 But for now, they rest up. 285 00:29:56,520 --> 00:29:59,040 They have big plans for the night. 286 00:30:06,120 --> 00:30:08,760 They wait until dark. 287 00:30:11,160 --> 00:30:14,919 With their extraordinary hearing and sense of smell. 288 00:30:14,920 --> 00:30:17,480 Darkness gives them the upper hand. 289 00:30:38,840 --> 00:30:42,360 It's well planned and well coordinated. 290 00:30:44,960 --> 00:30:46,959 But it's also risky. 291 00:31:49,240 --> 00:31:51,479 In clashes throughout Africa, 292 00:31:51,480 --> 00:31:56,079 elephants and humans are lost every year. 293 00:31:56,080 --> 00:31:59,160 This time, no one was hurt. 294 00:32:05,880 --> 00:32:10,480 Back in Amboseli, Esau's luck has finally changed. 295 00:32:14,080 --> 00:32:17,440 He's found a female at the peak of estrus. 296 00:32:22,040 --> 00:32:26,880 Her son naps, oblivious to the events about to unfold. 297 00:32:29,520 --> 00:32:34,279 Of course, Esau's not the only male to catch her scent. 298 00:32:34,280 --> 00:32:36,520 He needs to clear the stage. 299 00:32:40,120 --> 00:32:43,759 There are multiple males circling, hopeful. 300 00:32:52,840 --> 00:32:57,919 As Esau approaches, he's exceptionally gentle, 301 00:32:57,920 --> 00:32:59,679 even as he blocks the other males. 302 00:33:06,760 --> 00:33:08,640 She allows him closer. 303 00:33:14,760 --> 00:33:20,240 Lifting 6 tons and finding his target takes remarkable skill. 304 00:33:23,240 --> 00:33:26,439 Fending off interlopers is another challenge. 305 00:33:31,120 --> 00:33:33,080 Her calf stays close. 306 00:33:43,680 --> 00:33:47,239 Esau will stay with this female for the next few days, 307 00:33:47,240 --> 00:33:49,640 guarding her from other males. 308 00:34:02,080 --> 00:34:05,240 The morning's events have been very instructive. 309 00:34:08,360 --> 00:34:12,279 Young males practice endlessly, building the skills 310 00:34:12,280 --> 00:34:14,960 they'll need when they're old enough to mate. 311 00:34:23,440 --> 00:34:27,719 Juveniles from other families join in. 312 00:34:27,720 --> 00:34:31,719 This young teen is testing the boundaries with a female. 313 00:34:38,440 --> 00:34:41,440 He sorely lacks Esau's decorum. 314 00:34:44,640 --> 00:34:47,519 Just as Esau did at his age, 315 00:34:47,520 --> 00:34:50,120 this 12-year-old is taking his first steps 316 00:34:50,240 --> 00:34:52,120 towards independence. 317 00:34:53,320 --> 00:34:54,920 In the coming years, 318 00:34:55,040 --> 00:34:58,640 he'll wander farther and farther from his family. 319 00:35:01,440 --> 00:35:04,120 It's a dangerous time for young males 320 00:35:04,240 --> 00:35:06,319 when they strike out on their own. 321 00:35:06,320 --> 00:35:12,279 Lack of experience and bad choices can be lethal. 322 00:35:12,280 --> 00:35:17,079 Eventually, they'll find a group of bulls like Pascal's. 323 00:35:20,760 --> 00:35:24,520 There's safety in the company of experienced elders. 324 00:35:28,760 --> 00:35:34,039 Mature males like Pascal provides stability and guidance, 325 00:35:34,040 --> 00:35:37,120 helping them adjust to life outside the family. 326 00:35:40,880 --> 00:35:43,439 With decades more experience, 327 00:35:43,440 --> 00:35:47,839 older males know how to navigate the environment. 328 00:35:47,840 --> 00:35:50,760 This is critical for a young orphan like Theo. 329 00:35:58,120 --> 00:36:01,239 Older bulls can help keep younger males calm 330 00:36:01,240 --> 00:36:03,880 and help regulate aggression. 331 00:36:07,480 --> 00:36:09,320 Once they come into must, 332 00:36:09,440 --> 00:36:12,919 they'll leave their companions to mate. 333 00:36:12,920 --> 00:36:16,319 But when must has passed, they'll return. 334 00:36:31,120 --> 00:36:33,879 The dry season is moving in, 335 00:36:33,880 --> 00:36:39,359 and Amboseli's grasslands have turned gold again. 336 00:36:39,360 --> 00:36:46,519 When the pendulum of seasons swings, everyone must adapt. 337 00:36:46,520 --> 00:36:50,719 This expert survivor has an advantage. 338 00:36:50,720 --> 00:36:56,359 Her long roots help her reach water buried deep underground. 339 00:36:56,360 --> 00:37:01,519 She has witnessed five centuries of seasonal swings. 340 00:37:01,520 --> 00:37:03,520 But in recent decades, 341 00:37:03,640 --> 00:37:06,039 the extremes have become more pronounced. 342 00:37:06,040 --> 00:37:08,480 Dry spells are lasting longer. 343 00:37:14,280 --> 00:37:16,679 Now more than ever, 344 00:37:16,680 --> 00:37:18,959 the accumulated memories and knowledge 345 00:37:18,960 --> 00:37:22,080 held by the elders is crucial. 346 00:37:29,720 --> 00:37:33,320 Kiba's family has remained in Amboseli. 347 00:37:33,440 --> 00:37:37,639 At 4 years old, he's still very dependent. 348 00:37:37,640 --> 00:37:39,559 It will be years before he starts 349 00:37:39,560 --> 00:37:41,760 to venture off on his own. 350 00:37:46,960 --> 00:37:51,640 As the morning heats up, his family heads to the swamps. 351 00:38:00,840 --> 00:38:04,560 Last night, lions brought down a cape buffalo. 352 00:38:06,640 --> 00:38:09,720 The scent of a fresh kill is a magnet. 353 00:38:25,320 --> 00:38:28,359 As Kibo's family heads east, 354 00:38:28,360 --> 00:38:31,440 the feast is directly on their path. 355 00:38:36,240 --> 00:38:38,880 They are immediately agitated. 356 00:38:48,160 --> 00:38:52,319 Lions or hyenas can take down a young elephant, 357 00:38:52,320 --> 00:38:55,920 but not when there's a protective family. 358 00:38:56,040 --> 00:39:00,439 Still, this emotionally complex species has been known 359 00:39:00,440 --> 00:39:03,320 to be troubled by a kill. 360 00:39:03,440 --> 00:39:06,040 Perhaps the carnage is disturbing. 361 00:39:09,120 --> 00:39:12,319 Kibo is fascinated. 362 00:39:12,320 --> 00:39:15,480 He manages to get swept up in the chaos. 363 00:39:22,960 --> 00:39:25,560 The females are highly protective. 364 00:39:31,440 --> 00:39:34,479 A young mother makes one final charge 365 00:39:34,480 --> 00:39:36,520 before the family moves on. 366 00:39:38,720 --> 00:39:42,520 Kibo will be under close watch for years to come. 367 00:39:42,640 --> 00:39:45,039 He still has much to learn. 368 00:39:54,360 --> 00:39:56,919 On the southern border of the park, 369 00:39:56,920 --> 00:39:59,360 Esau is badly hurt. 370 00:40:03,320 --> 00:40:06,640 With dust, he tries to soothe the pain. 371 00:40:09,240 --> 00:40:11,839 He survived a battle with another bull, 372 00:40:11,840 --> 00:40:14,160 but the wound is serious. 373 00:40:20,080 --> 00:40:24,559 He's fallen out of must, and his demeanor is now slower. 374 00:40:33,560 --> 00:40:36,320 He's headed to his bachelor range, 375 00:40:36,440 --> 00:40:39,239 where he'll find the comfort of companionship 376 00:40:39,240 --> 00:40:41,159 and familiar terrain. 377 00:40:50,280 --> 00:40:54,519 He's fighting the pain, but the gash is becoming infected. 378 00:40:59,920 --> 00:41:03,959 With a serious injury and highly coveted tusks, 379 00:41:03,960 --> 00:41:06,720 he's heading southward to Tanzania, 380 00:41:06,840 --> 00:41:09,320 a country that allows trophy hunting. 381 00:41:14,880 --> 00:41:17,119 Each time he crosses the border, 382 00:41:17,120 --> 00:41:20,440 his growing tusks increase his risk. 383 00:41:22,840 --> 00:41:26,160 But to Esau, there are no borders. 384 00:41:27,840 --> 00:41:29,720 This is where elephants have traveled 385 00:41:29,840 --> 00:41:31,919 for thousands of years, 386 00:41:31,920 --> 00:41:34,520 following the paths of their ancestors. 387 00:41:42,320 --> 00:41:45,079 Craig has chosen a different path. 388 00:41:45,080 --> 00:41:48,160 He remains on the outskirts of Amboseli. 389 00:41:51,760 --> 00:41:54,120 In his older, wiser years, 390 00:41:54,240 --> 00:41:57,960 he no longer takes the risks he did at Esau's age. 391 00:42:01,840 --> 00:42:04,759 Craig is still a viable breeder, 392 00:42:04,760 --> 00:42:08,520 but he didn't come into must this year due to the drought. 393 00:42:12,120 --> 00:42:15,119 He lacks the physical bulk of Pascal. 394 00:42:15,120 --> 00:42:17,439 It's harder to eke out a living here, 395 00:42:17,440 --> 00:42:20,480 but it's far less risky than raiding crops. 396 00:42:23,440 --> 00:42:27,159 Their distinct choices reflect a deep intelligence 397 00:42:27,160 --> 00:42:29,520 and individuality. 398 00:42:29,640 --> 00:42:34,040 Like us, no two elephants are exactly alike. 399 00:42:36,640 --> 00:42:39,479 Craig is a rarity. 400 00:42:39,480 --> 00:42:42,679 While so many tuskers have been lost to the lust for ivory 401 00:42:42,680 --> 00:42:44,679 and human conflict, 402 00:42:44,680 --> 00:42:48,519 Craig has survived for over 50 years, 403 00:42:48,520 --> 00:42:52,879 and he's sharing his wisdom. 404 00:42:52,880 --> 00:42:57,839 These young bulls have also chosen to stay near Amboseli. 405 00:42:57,840 --> 00:43:01,120 Here, they have a well-seasoned mentor, 406 00:43:01,240 --> 00:43:03,920 and Craig has companionship. 407 00:43:06,080 --> 00:43:10,879 This wise old tusker could live into his 60s, 408 00:43:10,880 --> 00:43:14,039 a remarkable feat considering the threats 409 00:43:14,040 --> 00:43:16,120 facing these elephants. 410 00:43:20,440 --> 00:43:23,520 Esau has crossed back to Kenya. 411 00:43:23,640 --> 00:43:28,679 He's only 33, but already his future is fading. 412 00:43:28,680 --> 00:43:31,560 His wound is severely infected. 413 00:43:33,680 --> 00:43:36,240 Perhaps he's returned to find help. 414 00:43:38,080 --> 00:43:40,120 Is it possible he knows 415 00:43:40,240 --> 00:43:43,920 that desperate measures are underway to save his life? 416 00:44:06,840 --> 00:44:10,880 Esau faces much more than threat from infection. 417 00:44:13,040 --> 00:44:17,039 A satellite collar, evidence of a scientific study, 418 00:44:17,040 --> 00:44:20,520 might be his only hope of surviving trophy hunters. 419 00:44:23,560 --> 00:44:29,440 These magnificent tusks are both a blessing and a curse. 420 00:44:32,360 --> 00:44:36,640 When Esau awakens, his world will have shifted. 421 00:45:08,680 --> 00:45:12,119 With an unfamiliar weight around his neck, 422 00:45:12,120 --> 00:45:15,040 Esau heads back across the invisible line. 423 00:45:17,040 --> 00:45:21,879 Losing Esau would ripple far beyond a single life. 424 00:45:21,880 --> 00:45:26,320 It would sever an ancient lineage that is irreplaceable. 425 00:45:30,320 --> 00:45:33,479 Esau has crossed this border for decades, 426 00:45:33,480 --> 00:45:36,119 as have thousands of elephants. 427 00:45:36,120 --> 00:45:38,440 But the rules have changed. 428 00:45:39,840 --> 00:45:45,959 To survive, elephants must be able to migrate. 429 00:45:45,960 --> 00:45:49,039 On the far edge of Kimana sanctuary, 430 00:45:49,040 --> 00:45:51,279 Pascal drinks from a stream 431 00:45:51,280 --> 00:45:54,640 that has served migrating elephants for millennia. 432 00:45:58,040 --> 00:46:00,879 It's a favorite stopover between Amboseli 433 00:46:00,880 --> 00:46:03,120 and the national parks to the east. 434 00:46:08,040 --> 00:46:11,919 This very scene could have been glimpsed a thousand years ago, 435 00:46:11,920 --> 00:46:15,439 but not if you widen your gaze. 436 00:46:15,440 --> 00:46:18,159 The stream lies on the outskirts of a town 437 00:46:18,160 --> 00:46:22,160 that sits directly on the elephants' migratory path. 438 00:46:24,960 --> 00:46:27,719 A highway has grown from a footpath, 439 00:46:27,720 --> 00:46:32,520 and now vehicles hurtle across Pascal's reach to Amboseli. 440 00:46:36,360 --> 00:46:38,319 Just beyond the stream, 441 00:46:38,320 --> 00:46:42,479 a corridor has been created for elephants like Pascal. 442 00:46:42,480 --> 00:46:44,720 It funnels them across the highway 443 00:46:44,840 --> 00:46:47,160 and past the encroaching farms. 444 00:46:49,840 --> 00:46:53,479 The corridor is just 80 meters wide, 445 00:46:53,480 --> 00:46:55,959 flanked by electric fences. 446 00:46:55,960 --> 00:46:58,879 It's the last viable link between Amboseli 447 00:46:58,880 --> 00:47:00,879 and the parks to the east, 448 00:47:00,880 --> 00:47:07,319 absolutely crucial habitat for elephants and all wildlife. 449 00:47:07,320 --> 00:47:11,320 Big Life Foundation created the fences as a buffer 450 00:47:11,440 --> 00:47:15,039 between humans and elephants like Pascal, 451 00:47:15,040 --> 00:47:18,519 with high-voltage electricity and speed bumps. 452 00:47:18,520 --> 00:47:23,439 This narrow corridor is a lifeline for wildlife. 453 00:47:23,440 --> 00:47:28,560 Cameras offer proof that it's working not just for elephants. 454 00:47:40,520 --> 00:47:44,319 This strange, severed landscape is not the world 455 00:47:44,320 --> 00:47:47,920 Pascal was born into 44 years ago. 456 00:47:59,080 --> 00:48:02,479 Pascal knows this land by heart. 457 00:48:02,480 --> 00:48:05,080 Every hill, every path. 458 00:48:09,480 --> 00:48:12,319 In the final blaze of the dry season, 459 00:48:12,320 --> 00:48:15,480 he knows the best acacia tree for shade. 460 00:48:20,240 --> 00:48:22,959 He knows where to find the few small mudholes 461 00:48:22,960 --> 00:48:25,640 that won't dry up if the rains are late. 462 00:48:28,440 --> 00:48:32,320 And now these younger males know, as well. 463 00:48:39,840 --> 00:48:44,679 The day is hot, but the rains will soon arrive. 464 00:48:44,680 --> 00:48:47,319 The elephants are well aware. 465 00:48:47,320 --> 00:48:50,559 They picked up its scent from miles away 466 00:48:50,560 --> 00:48:52,919 and caught the rumble of distant thunder 467 00:48:52,920 --> 00:48:55,319 through the soles of their feet. 468 00:49:28,240 --> 00:49:31,960 The rains have turned Amboseli green again. 469 00:49:34,040 --> 00:49:37,320 Elephant families are pouring back to the park 470 00:49:37,440 --> 00:49:40,519 to celebrate and reunite. 471 00:49:46,680 --> 00:49:50,559 Another year has passed, and infants have turned into 472 00:49:50,560 --> 00:49:57,119 young boys with big bluster and tiny tusks. 473 00:49:57,120 --> 00:49:59,839 Females are carrying new life. 474 00:50:05,120 --> 00:50:09,119 Craig is taking advantage of the abundance. 475 00:50:09,120 --> 00:50:11,360 He'll soon turn 53. 476 00:50:14,360 --> 00:50:16,879 Flanked by his comrades, 477 00:50:16,880 --> 00:50:20,239 this venerable male is sharing his wisdom. 478 00:50:28,760 --> 00:50:32,639 Pascal has returned to the park. 479 00:50:32,640 --> 00:50:37,119 He's back in must and is more impressive than ever. 480 00:50:43,040 --> 00:50:46,519 Amboseli is at its finest. 481 00:50:46,520 --> 00:50:50,640 Green and teeming with elephant families. 482 00:50:52,840 --> 00:50:56,320 But it's missing one crucial character. 483 00:51:07,560 --> 00:51:10,960 It's Esau, back from Tanzania. 484 00:51:12,640 --> 00:51:16,439 His tusks and his collar are intact. 485 00:51:16,440 --> 00:51:18,280 His wound has healed. 486 00:51:21,640 --> 00:51:26,079 Each of these great tuskers is a miracle of survival 487 00:51:26,080 --> 00:51:28,560 and a key to the future. 488 00:51:32,280 --> 00:51:34,559 Although they may not know it, 489 00:51:34,560 --> 00:51:41,319 their impact is profound, and it's already taking shape. 490 00:51:41,320 --> 00:51:47,119 Because right now, somewhere on the plains of Amboseli, 491 00:51:47,120 --> 00:51:52,079 growing and learning every day 492 00:51:52,080 --> 00:51:56,919 are the world's next great tuskers.