1 00:00:01,800 --> 00:00:05,359 Dolphins. The cleverest creatures in the ocean. 2 00:00:06,800 --> 00:00:10,439 They may seem familiar, but their undersea lives are a mystery. 3 00:00:13,120 --> 00:00:16,399 Spy creatures explore their hidden world... 4 00:00:18,320 --> 00:00:20,319 ..discovering amazing abilities... 5 00:00:22,800 --> 00:00:24,599 ..and strange gatherings. 6 00:00:25,440 --> 00:00:27,879 Revealing their intimate relationships... 7 00:00:28,760 --> 00:00:30,559 as well as their conflicts. 8 00:00:32,080 --> 00:00:35,279 Discover the intelligence of these fun-loving creatures... 9 00:00:38,160 --> 00:00:41,439 ...and enter their lives as never before. 10 00:00:58,000 --> 00:01:01,719 In the sea off Mozambique is a secret world. 11 00:01:04,920 --> 00:01:07,359 It's home to the bottlenose dolphin, 12 00:01:07,520 --> 00:01:10,799 the most widespread and best-known dolphin in the world. 13 00:01:12,280 --> 00:01:17,239 Despite their familiarity their life below the waves is steeped in mystery. 14 00:01:19,400 --> 00:01:21,879 But all this is about to change. 15 00:01:26,000 --> 00:01:30,599 For here, even a giant clam is not quite as it seems. 16 00:01:32,200 --> 00:01:35,799 And these super smart dolphins are suitably intrigued. 17 00:01:38,120 --> 00:01:41,679 They know that this clam is like none they have ever seen before. 18 00:01:43,080 --> 00:01:45,079 (Chattering) 19 00:02:06,240 --> 00:02:10,599 These are nautilus, alien creatures from the deep abyss. 20 00:02:12,000 --> 00:02:15,159 But these are organisms of a very special kind. 21 00:02:15,800 --> 00:02:19,079 For their eyes are state-of-the-art cameras. 22 00:02:25,520 --> 00:02:30,319 Nautilus soon meets the long probing nose that gives these dolphins their name. 23 00:02:38,400 --> 00:02:42,719 Bottlenose dolphins have excellent eyesight but they have another way to see. 24 00:02:43,920 --> 00:02:46,639 They can beam sound waves from their forehead. 25 00:02:46,800 --> 00:02:48,799 (Clicking) 26 00:02:50,840 --> 00:02:54,799 And use the returning echoes to create a picture in sound. 27 00:02:59,600 --> 00:03:02,199 This sonar penetrates like an X-ray. 28 00:03:02,360 --> 00:03:04,359 (Chatters) 29 00:03:06,800 --> 00:03:08,799 There's nothing to eat in here! 30 00:03:12,160 --> 00:03:15,079 The dolphins are so completely at ease with Spy Nautilus, 31 00:03:15,240 --> 00:03:18,879 a mother is happy to reveal her own precious secret. 32 00:03:19,040 --> 00:03:22,919 Her newborn baby, just five days old. 33 00:03:32,000 --> 00:03:35,279 He still bears wrinkles from his time curled up in the womb. 34 00:03:42,640 --> 00:03:47,679 His mother can stay down for 15 minutes, but he must breathe every two. 35 00:03:49,240 --> 00:03:54,239 So, for his first few weeks of life, she makes sure he's only a few metres from the surface. 36 00:03:55,920 --> 00:03:59,559 He has been born into an extended family made up of aunts and other females. 37 00:04:03,360 --> 00:04:07,719 Each dolphin has its own unique signature whistle that it uses just like a name. 38 00:04:07,880 --> 00:04:09,879 (Whistling) 39 00:04:11,000 --> 00:04:15,439 The baby will learn these whistles and soon recognise each and every dolphin. 40 00:04:20,000 --> 00:04:21,399 Pod members come and go, 41 00:04:21,560 --> 00:04:25,879 but their enduring friendships are strengthened by touching and tickling each other. 42 00:04:30,640 --> 00:04:33,159 As well as an underwater version of cuddling. 43 00:04:44,120 --> 00:04:48,999 For mother and baby close physical contact is an essential part of their relationship. 44 00:04:52,680 --> 00:04:55,839 For the next two years they will never be apart. 45 00:05:01,320 --> 00:05:05,599 Further along the Mozambique coast another spy creature has appeared. 46 00:05:07,800 --> 00:05:09,919 This is Spy Turtle. 47 00:05:12,160 --> 00:05:17,199 He is keeping his beady camera eye on another group of bottlenose - 48 00:05:17,360 --> 00:05:19,559 this time a pod of males. 49 00:05:28,400 --> 00:05:31,479 Dolphins are intrigued by this strange but harmless turtle, 50 00:05:31,640 --> 00:05:34,439 so it can easily film them when they come to the surface. 51 00:05:36,680 --> 00:05:40,399 It can also watch their activities beneath the waves as well. 52 00:05:44,600 --> 00:05:47,879 No other spy creature has such a perfect overview. 53 00:06:01,800 --> 00:06:05,879 Male dolphins live mostly bachelor lives away from the females 54 00:06:06,040 --> 00:06:08,279 and their life is sociable and happy-go-lucky. 55 00:06:09,400 --> 00:06:14,359 Like the female pod, males come and go, but there is always a core "band of brothers", 56 00:06:14,520 --> 00:06:16,519 who can be friends for life. 57 00:06:17,120 --> 00:06:22,079 To film their energetic and carefree lifestyle Spy Turtle will have to shift up a gear. 58 00:06:29,800 --> 00:06:31,879 He does his best to keep up. 59 00:06:51,360 --> 00:06:53,599 But he's soon outperformed. 60 00:07:01,720 --> 00:07:06,279 All dolphins love to leap but these boy racers love it more than most. 61 00:07:06,920 --> 00:07:09,519 The best can jump nearly six metres. 62 00:07:32,240 --> 00:07:34,719 Some can really do it in style! 63 00:07:46,200 --> 00:07:51,679 Across the world, off the coast of Central America, lives an even more energetic dolphin. 64 00:07:53,400 --> 00:07:58,279 To film their high-speed antics, a new and faster spy creature joins the team. 65 00:08:01,520 --> 00:08:07,119 Spy Dolphin reaches 15 miles per hour and also has HD cameras for eyes. 66 00:08:11,320 --> 00:08:13,039 But he'll have his work cut out - 67 00:08:13,200 --> 00:08:18,519 these spinner dolphins can easily travel 250 miles in a single day. 68 00:08:21,160 --> 00:08:24,359 And he soon discovers just why they're called spinners. 69 00:08:33,920 --> 00:08:36,079 They are curious about Spy Dolphin. 70 00:08:37,240 --> 00:08:41,119 As they jump, they sneak a peek at their strange travelling companion. 71 00:08:50,880 --> 00:08:55,399 To film underwater another super-fast spy creature enters the fray. 72 00:08:59,680 --> 00:09:02,879 Spy Tuna can rapidly infiltrate these dolphins. 73 00:09:04,400 --> 00:09:10,079 And use the camera in her mouth to capture the first ever images from inside the pod. 74 00:09:14,240 --> 00:09:20,119 She soon discovers that what Spy Dolphin saw at the surface was just the tip of the iceberg. 75 00:09:21,400 --> 00:09:23,399 (Chattering) 76 00:09:27,000 --> 00:09:29,479 Although dolphins normally travel in small groups, 77 00:09:29,640 --> 00:09:32,879 they sometimes come together in spectacular numbers. 78 00:09:34,240 --> 00:09:39,479 This is a super pod - made up of hundreds upon hundreds of dolphins. 79 00:09:47,800 --> 00:09:50,839 But it's not Spy Tuna's only revelation. 80 00:09:54,960 --> 00:09:58,999 She soon discovers just how their extraordinary leaps are performed. 81 00:10:10,240 --> 00:10:12,919 Rapid beats of the tail provide the power. 82 00:10:18,000 --> 00:10:20,719 While twisting starts as they leave the water. 83 00:10:23,880 --> 00:10:27,999 Sheer muscle drives their spectacular aerial display. 84 00:10:43,880 --> 00:10:47,759 No other dolphin accomplishes these astonishing corkscrews. 85 00:11:01,120 --> 00:11:05,359 Back in Mozambique, the young dolphin is off on his first adventure. 86 00:11:15,600 --> 00:11:17,679 Stingrays are a common sight. 87 00:11:17,840 --> 00:11:22,399 His mother uses warning calls to teach him to avoid the sting in their tail. 88 00:11:25,600 --> 00:11:28,399 But it seems this is not just a passing ray. 89 00:11:31,360 --> 00:11:33,839 Something far more mysterious is happening. 90 00:11:39,640 --> 00:11:42,279 The stingrays are gathering together. 91 00:11:46,120 --> 00:11:47,399 The dolphins join in: 92 00:11:47,560 --> 00:11:52,679 their unrivalled knowledge of ocean life tells them that this entourage is well worth following. 93 00:11:58,680 --> 00:12:04,639 Leading them is an extremely rare, small-eyed stingray - the biggest stingray in the ocean. 94 00:12:09,200 --> 00:12:11,479 Shadowing the rays are cobia fish. 95 00:12:12,800 --> 00:12:16,479 These renowned scavengers confirm that a meal is on its way. 96 00:12:29,400 --> 00:12:34,879 This is the first time such an extraordinary gathering of sea creatures has been recorded, 97 00:12:35,040 --> 00:12:38,679 but to the wordly-wise dolphins it must be a common sight. 98 00:12:39,520 --> 00:12:43,319 It's an early lesson for the new baby, but he'll have to hold his breath. 99 00:12:47,200 --> 00:12:51,999 He's learning that rays possess a unique skill - one that might lead them to a meal. 100 00:12:58,000 --> 00:13:01,679 On the ray's underside is an array of electro sensors. 101 00:13:02,560 --> 00:13:07,399 These detect the minute electrical discharges given off by other animals, 102 00:13:07,560 --> 00:13:09,719 even those buried in the sand. 103 00:13:11,120 --> 00:13:15,159 When the ray senses a hidden fish it stops and sucks it into its mouth, 104 00:13:15,320 --> 00:13:19,479 while all the followers can do is scramble for scraps left behind. 105 00:13:23,800 --> 00:13:26,079 But dolphins are smarter. 106 00:13:29,880 --> 00:13:33,159 Having used the rays as guides to the best fishing grounds, 107 00:13:33,320 --> 00:13:37,199 they then deploy their own super-senses to find the buried treasure. 108 00:13:39,200 --> 00:13:43,519 Their sonar penetrates the sand and bounces off the hidden meals. 109 00:13:43,680 --> 00:13:45,679 (Clicking) 110 00:13:53,000 --> 00:13:56,119 The baby has sonar too, but he's still just trying it out. 111 00:13:56,280 --> 00:13:58,679 (Chatter and clicking) 112 00:14:05,920 --> 00:14:08,839 His mother's domed forehead, known as the melon, 113 00:14:09,000 --> 00:14:11,479 concentrates the sound waves into a beam. 114 00:14:16,000 --> 00:14:20,039 The returning echoes reveal the shape and type of any hidden fish. 115 00:14:24,600 --> 00:14:26,599 Some make a dash for it... 116 00:14:29,520 --> 00:14:32,239 ..but there's always plenty more fish in the sea. 117 00:14:32,480 --> 00:14:33,359 (Clicking) 118 00:14:33,520 --> 00:14:35,519 She tries again. 119 00:14:36,120 --> 00:14:41,439 By increasing the speed and intensity of her clicks, she can search deeper into the sand. 120 00:14:43,160 --> 00:14:46,799 And a concentrated blast of sonar can even stun the fish. 121 00:14:48,960 --> 00:14:50,959 (Clicking intensifies) 122 00:14:53,000 --> 00:14:54,999 Success at last! 123 00:14:58,880 --> 00:15:01,439 It's not a moment too soon for the baby dolphin. 124 00:15:01,600 --> 00:15:05,079 He's held his breath for a record-breaking three and a half minutes! 125 00:15:08,960 --> 00:15:11,359 He now gets his own reward. 126 00:15:12,800 --> 00:15:17,559 The milk from his mother's watertight pouch is six times richer than cow's milk. 127 00:15:19,360 --> 00:15:23,279 Reared on this nutritious diet, he'll double in size in just one month. 128 00:15:25,560 --> 00:15:28,239 By shadowing his mother, the calf learns hunting methods 129 00:15:28,400 --> 00:15:31,079 unique to catching fish in his local area. 130 00:15:32,520 --> 00:15:37,399 Like so many things in a dolphin's life, the knowledge that rays are a good guide to a meal 131 00:15:37,560 --> 00:15:39,679 is handed down from mother to calf. 132 00:15:44,160 --> 00:15:49,479 And the same intelligent learning is also seen among other dolphin pods throughout the world. 133 00:15:53,400 --> 00:15:58,479 The shallow waters of the Florida Keys create a very different challenge for a bottlenose dolphin. 134 00:16:00,200 --> 00:16:03,079 The way they catch fish is even more inventive. 135 00:16:05,760 --> 00:16:06,679 (Whirring) 136 00:16:06,840 --> 00:16:09,519 It's a perfect mission for Spy Dolphin. 137 00:16:21,680 --> 00:16:23,799 But he won't be working alone. 138 00:16:26,880 --> 00:16:31,439 Beneath the waves, a new spy creature joins the underwater menagerie. 139 00:16:55,200 --> 00:16:59,239 Spy Ray: a creature that glides along the bottom 140 00:16:59,400 --> 00:17:02,039 as it follows the dolphins across the sea grass. 141 00:17:11,040 --> 00:17:14,239 Its subjects have devised an extraordinary hunting technique 142 00:17:14,400 --> 00:17:16,279 especially for these conditions. 143 00:17:21,960 --> 00:17:26,839 It starts when a dolphin deliberately beats his tail to stir up a plume of mud. 144 00:17:34,520 --> 00:17:38,439 Covering the unsuspecting fish, as well as Spy Ray. 145 00:17:44,200 --> 00:17:46,799 He soon forms a U-shaped mud plume. 146 00:17:54,600 --> 00:17:59,879 And then ploughs through the cloud, catching any fish confused by the sudden blackout. 147 00:18:06,600 --> 00:18:11,039 He's chasing ballyhoos - one of the fastest reacting fish in the sea. 148 00:18:16,080 --> 00:18:21,079 But the dolphin's sonar can see right through the mud while the fish can't see her coming. 149 00:18:26,600 --> 00:18:29,959 Usually, the dolphin wouldn't stand a chance with these fish, 150 00:18:30,120 --> 00:18:34,679 but by using his intelligence to create a mud screen he regains the advantage. 151 00:18:38,520 --> 00:18:40,039 Further along the Keys, 152 00:18:40,200 --> 00:18:44,439 the spy creatures discover that when dolphins cooperate to use the mud 153 00:18:44,600 --> 00:18:46,559 they can achieve even more success. 154 00:18:49,200 --> 00:18:52,919 By working as a team they have devised a way to hunt mullet. 155 00:18:54,960 --> 00:18:57,479 One member of the pod races ahead of the shoal 156 00:18:57,640 --> 00:19:00,159 and again beats her tail to create a mud wall. 157 00:19:01,480 --> 00:19:06,079 But this time she creates a complete circle, entrapping the fish inside. 158 00:19:07,800 --> 00:19:11,239 As the mud-ring spreads, the mullet try to escape the trap - 159 00:19:11,400 --> 00:19:14,119 leaping into the mouths of the waiting dolphins. 160 00:19:19,000 --> 00:19:23,959 Once all of the fish have jumped, the dolphins start again, forming a new mud ring. 161 00:19:29,200 --> 00:19:32,239 The dolphins then wait for the next fish eruption. 162 00:19:33,840 --> 00:19:37,679 Spy Dolphin noses closer to take up a ringside seat. 163 00:19:58,560 --> 00:20:02,159 The youngsters learn the art of catching by watching the experts. 164 00:20:10,880 --> 00:20:15,559 These unique techniques are only known by dolphins local to these shallow waters, 165 00:20:15,720 --> 00:20:19,279 and these skills are passed on from generation to generation. 166 00:20:54,280 --> 00:20:57,839 When they've caught all they need it's a chance to show-off. 167 00:21:11,240 --> 00:21:16,759 Back in Mozambique the pod of females are skirting the coast looking for their next meal. 168 00:21:17,560 --> 00:21:22,879 This time they are after another local delicacy that requires yet another tactic. 169 00:21:25,160 --> 00:21:27,479 Fish shoals are surprisingly noisy, 170 00:21:27,640 --> 00:21:31,359 and dolphins can hear the sounds they make from ten miles away. 171 00:21:34,160 --> 00:21:38,399 Nautilus is among the many spy creatures watching the dolphins' plan unfurl. 172 00:21:38,560 --> 00:21:40,559 (Rustling and crackling) 173 00:21:55,040 --> 00:21:59,119 The youngster is over a month old now and can stay down for longer, 174 00:21:59,280 --> 00:22:02,119 but diving deep is always a great adventure. 175 00:22:08,160 --> 00:22:10,479 They are hunting huge kingfish. 176 00:22:10,640 --> 00:22:13,639 Some reach over a metre and weigh 15 kilos. 177 00:22:14,040 --> 00:22:16,439 They are far from easy to catch. 178 00:22:18,520 --> 00:22:21,239 The young dolphin is still only an observer, 179 00:22:21,400 --> 00:22:24,599 but this is how he learns the skills needed later in life. 180 00:22:31,920 --> 00:22:33,599 The dolphins take their time. 181 00:22:33,760 --> 00:22:35,839 They know they can't outpace the kingfish, 182 00:22:36,000 --> 00:22:42,119 so their idea is to scan each fish with sonar and select only the weakest, slowest individuals. 183 00:23:04,160 --> 00:23:05,919 And there it is! 184 00:23:06,080 --> 00:23:08,559 She's found her target and gives chase. 185 00:23:18,200 --> 00:23:19,839 It's a big catch. 186 00:23:20,000 --> 00:23:23,239 A nursing mother must eat 15 kilos of fish a day, 187 00:23:23,400 --> 00:23:27,119 so just one kingfish can provide all her daily requirements. 188 00:23:30,200 --> 00:23:32,599 She heads back to the depths. 189 00:23:34,800 --> 00:23:37,559 And Spy Ray soon discovers the reason. 190 00:23:40,160 --> 00:23:44,079 They use the seabed to help break the fish into smaller pieces. 191 00:23:45,800 --> 00:23:48,559 It's another new discovery for the spy creatures. 192 00:23:50,200 --> 00:23:52,519 But more revelations are in store. 193 00:23:55,280 --> 00:23:58,479 Killing such big fish has unexpected consequences. 194 00:23:58,840 --> 00:24:04,319 The parasites of their prey have jumped ship and attached themselves to the dolphins. 195 00:24:06,160 --> 00:24:10,839 Even the young dolphin has acquired an unwelcome hitchhiker - just beneath his eye. 196 00:24:14,640 --> 00:24:19,239 It's a remora: a suckerfish that lives by eating the dolphin's leftovers. 197 00:24:20,640 --> 00:24:23,159 They skip around like an aquatic fly. 198 00:24:25,000 --> 00:24:29,479 But they're even more irritating than a gnat, and far harder to get rid of. 199 00:24:32,680 --> 00:24:34,799 The dolphins know a few tricks. 200 00:24:34,960 --> 00:24:38,119 Using the seabed to scrub them off is a good start. 201 00:24:42,600 --> 00:24:44,599 The youngster has a go. 202 00:24:45,720 --> 00:24:47,719 (Whistling) 203 00:24:55,000 --> 00:24:56,639 Then tries again. 204 00:25:00,920 --> 00:25:04,559 But whatever he does, the pesky remora stays on board. 205 00:25:12,400 --> 00:25:15,079 Even when he has to take a breath. 206 00:25:19,400 --> 00:25:21,719 He tries a different tack. 207 00:25:21,880 --> 00:25:24,399 Rubbing it against an unsuspecting dolphin. 208 00:25:26,320 --> 00:25:28,599 But has better luck with his mum. 209 00:25:30,800 --> 00:25:34,519 She accepts the unwelcome gift as only a mother can! 210 00:25:41,160 --> 00:25:42,599 Back in the Pacific Ocean, 211 00:25:42,760 --> 00:25:46,399 the spy cameras are finding that the spinners' extraordinary leaps 212 00:25:46,560 --> 00:25:49,239 might help them deal with their own remora problem. 213 00:26:01,080 --> 00:26:05,959 As a spinner leaps, it's clear that she too has a remora attached to her belly. 214 00:26:09,800 --> 00:26:14,399 By twisting violently she makes it hard for any hangers-on to stay on board. 215 00:26:16,040 --> 00:26:19,159 Most spinning dolphins have these unwelcome guests 216 00:26:19,320 --> 00:26:22,279 and it's likely that many are dislodged on impact. 217 00:26:29,400 --> 00:26:33,159 But they leap so persistently there must be other reasons too. 218 00:26:37,720 --> 00:26:41,719 Possibly it's a long distance signal that helps keep the pod together. 219 00:26:48,920 --> 00:26:53,759 But dolphins turn everything into a game and spinning soon becomes a competition. 220 00:27:35,120 --> 00:27:37,879 Practice starts at an early age. 221 00:27:41,000 --> 00:27:42,999 A cautious start. 222 00:27:46,160 --> 00:27:49,439 Then a spectacular leap, but without the spinning. 223 00:27:53,040 --> 00:27:55,039 Getting better. 224 00:27:57,880 --> 00:27:59,879 Better still. 225 00:28:02,200 --> 00:28:04,199 This is more like it. 226 00:28:06,480 --> 00:28:09,119 Finally, a jump to be proud of! 227 00:28:11,840 --> 00:28:13,839 It's a perfect ten. 228 00:28:25,640 --> 00:28:27,359 (Ship's horn) 229 00:28:27,520 --> 00:28:29,239 Meanwhile, in Mozambique, 230 00:28:29,400 --> 00:28:33,479 the boy racers have turned leaping into a new and dangerous game. 231 00:28:34,040 --> 00:28:36,159 Playing chicken with a supertanker. 232 00:28:43,120 --> 00:28:47,239 The huge bow wave offers a free ride with almost no effort at all. 233 00:28:51,040 --> 00:28:54,599 They go out of their way to play in this man-made surf. 234 00:29:18,000 --> 00:29:20,359 But all good things must come to an end. 235 00:29:23,000 --> 00:29:28,239 As Spy Turtle discovers, this band of brothers have plenty more ways to entertain themselves. 236 00:29:39,240 --> 00:29:43,759 Naturally, a favourite pastime involves chasing the opposite sex. 237 00:29:50,640 --> 00:29:54,279 But their boisterous arrival is a dangerous time for a baby. 238 00:30:05,160 --> 00:30:09,359 A gang of lusty males can kill a young calf if he gets in their way. 239 00:30:12,000 --> 00:30:15,079 And one male gets perilously close to the baby. 240 00:30:19,640 --> 00:30:21,479 The mother shepherds him away, 241 00:30:21,640 --> 00:30:25,319 while other females create a protective wall with their bodies. 242 00:30:28,240 --> 00:30:32,279 The rest confront the males as the baby vanishes behind a dolphin blockade. 243 00:30:36,080 --> 00:30:39,479 Knowing he's safe, his bodyguards return to face the males. 244 00:30:45,040 --> 00:30:47,599 Their scars are testament to previous fights. 245 00:30:50,920 --> 00:30:52,599 (Chattering) 246 00:31:00,120 --> 00:31:03,319 As always, the spy creatures are right in the thick of it. 247 00:31:08,040 --> 00:31:11,639 They are simply spectators, but as the females get the upper hand, 248 00:31:11,800 --> 00:31:14,799 the spy creatures become a soft target for the males. 249 00:31:18,080 --> 00:31:20,159 They soon run rings round Spy Turtle. 250 00:31:34,080 --> 00:31:36,639 And Nautilus gets some unwelcome attention... 251 00:31:41,240 --> 00:31:43,039 (Heavy thud) 252 00:31:43,200 --> 00:31:45,039 ..very unwelcome! 253 00:31:48,360 --> 00:31:49,559 (Chatters) 254 00:31:58,000 --> 00:32:03,239 But Turtle is made of sterner stuff and he keeps filming as the males are sent packing... 255 00:32:06,160 --> 00:32:08,279 ..while Nautilus is out for the count. 256 00:32:14,280 --> 00:32:18,119 Calm returns to the female pod and the baby is safe once more. 257 00:32:26,000 --> 00:32:27,679 With Nautilus out of action, 258 00:32:27,840 --> 00:32:31,679 it's time for a new spy creature to take on the feisty males. 259 00:32:32,840 --> 00:32:36,639 Spy Squid is perfectly suited to explore the coral reefs. 260 00:32:40,880 --> 00:32:45,559 Like all the spy creatures, his success relies on the dolphin's innate curiosity. 261 00:32:56,080 --> 00:32:57,599 (Squeaks) 262 00:33:04,440 --> 00:33:08,319 And like a real squid, he creates a jet of water to get around. 263 00:33:14,360 --> 00:33:19,439 Using this jet propulsion, he explores a reef that's a popular spot for the male dolphins. 264 00:33:24,080 --> 00:33:26,759 Why they come here has always been a mystery. 265 00:33:34,320 --> 00:33:39,039 But the squid soon discovers that they use the coral reef as an impromptu health spa. 266 00:33:41,000 --> 00:33:45,519 Favourite coral heads are used like pumice stones, helping to shed off old skin. 267 00:33:49,920 --> 00:33:53,239 They visit the same chosen scrubbing sites time and again. 268 00:34:01,720 --> 00:34:06,599 Incredibly, dolphins replace their outer layer of skin once every three hours. 269 00:34:07,440 --> 00:34:10,839 It's vital for an animal where streamlining is everything. 270 00:34:18,000 --> 00:34:21,479 By rubbing against the coral, they help speed up the process. 271 00:34:31,160 --> 00:34:33,159 It's the ultimate way to exfoliate. 272 00:34:40,160 --> 00:34:43,239 After a good scrub and a scratch, the dolphins move on. 273 00:34:46,000 --> 00:34:50,479 But Spy Squid has attracted the attention of some less friendly reef dwellers. 274 00:34:51,760 --> 00:34:56,079 Potato cod are nearly six feet long and weigh over 100 kilograms. 275 00:35:00,360 --> 00:35:02,679 And they eat squid for breakfast. 276 00:35:12,160 --> 00:35:14,159 Spy Squid is dicing with death. 277 00:35:25,800 --> 00:35:27,359 Time for a sharp exit. 278 00:35:39,200 --> 00:35:44,399 Meanwhile, the male dolphins have found yet more ways of occupying their overactive minds. 279 00:35:46,360 --> 00:35:48,119 (Waves crashing) 280 00:35:49,240 --> 00:35:52,879 Africa's southern coastline is renowned for its huge breakers. 281 00:35:53,400 --> 00:35:57,799 And whenever surf's up, it's the perfect time for the dolphins to catch a wave. 282 00:36:02,000 --> 00:36:06,119 Being so intelligent, dolphins like to keep themselves fully occupied. 283 00:36:09,640 --> 00:36:13,599 Unlike most animals, much of what they do is simply for fun. 284 00:36:18,120 --> 00:36:22,679 Like experienced surfers, the dolphins know that timing is everything. 285 00:36:36,600 --> 00:36:38,599 They turn in perfect synchrony. 286 00:37:27,280 --> 00:37:30,599 Squid finally catches up and goes for the ride of its life. 287 00:37:47,960 --> 00:37:51,879 But even for dolphins, the waves are sometimes just too challenging. 288 00:37:58,800 --> 00:38:01,039 And for the Squid, it's total wipe-out. 289 00:38:13,120 --> 00:38:16,999 Among the nearby female pod, the young dolphin is now over six months old. 290 00:38:19,640 --> 00:38:24,159 He'll keep suckling until he's nearly fully grown and ready to leave his mother. 291 00:38:26,520 --> 00:38:29,599 He's a bundle of energy and just loves to play and leap. 292 00:38:41,840 --> 00:38:44,839 But at this age, lessons are starting to get serious. 293 00:38:49,240 --> 00:38:53,879 One of the first was how to catch fish. Now he must learn to do it on his own. 294 00:38:54,040 --> 00:38:58,279 He must master using his sonar to locate food hidden in the sand. 295 00:38:58,440 --> 00:39:00,239 (Clicking) 296 00:39:05,320 --> 00:39:08,919 He's an attentive student, mirroring his mother's every move. 297 00:39:24,560 --> 00:39:27,639 But mastering his sonar isn't exactly child's play. 298 00:39:29,080 --> 00:39:32,199 A misfire will give the game away and scare off the fish. 299 00:39:33,480 --> 00:39:35,479 (Squeaks) 300 00:39:36,760 --> 00:39:38,199 Missed! 301 00:39:43,960 --> 00:39:47,879 Eventually, he gets the knack - and his much deserved reward. 302 00:39:53,120 --> 00:39:55,519 He will need these skills when, at two years old, 303 00:39:55,680 --> 00:39:59,759 he will finally leave the maternal group to set up life outside. 304 00:40:05,600 --> 00:40:09,679 Back with the spinners, Spy Turtle joins the other spy creatures. 305 00:40:19,440 --> 00:40:21,999 As the pod passes, he's completely surrounded. 306 00:40:25,960 --> 00:40:29,039 A super pod like this can be over half a mile long. 307 00:40:34,560 --> 00:40:35,599 Down below, 308 00:40:35,760 --> 00:40:39,759 Tuna is suffering the consequences of being in the heart of the action. 309 00:40:44,200 --> 00:40:49,159 Dolphins consume a lot of fish... and the result is a lot of waste. 310 00:40:52,160 --> 00:40:56,559 But for dolphins, pooing on your friends is socially acceptable. 311 00:40:58,280 --> 00:41:03,039 It's full of pheromones - giving information about the state and mood of other dolphins, 312 00:41:03,200 --> 00:41:05,319 as well as the food they've just eaten. 313 00:41:07,520 --> 00:41:09,879 It's all too easy to take a direct hit. 314 00:41:17,400 --> 00:41:22,399 This is actually a complement - she really is a dolphin-friendly tuna. 315 00:41:26,840 --> 00:41:31,399 Out of the firing line, Turtle is still having a bit of trouble keeping up. 316 00:41:33,240 --> 00:41:35,039 He valiantly does his best. 317 00:41:36,040 --> 00:41:39,799 But when they really press the accelerator, there is nothing he can do. 318 00:42:12,240 --> 00:42:14,239 Tuna isn't so easily outclassed. 319 00:42:15,040 --> 00:42:17,919 And she soon spies why the spinners are so excited. 320 00:42:21,640 --> 00:42:23,999 Bubbles stream from the spinners' blowholes, 321 00:42:24,160 --> 00:42:27,119 showing that the dolphins are whistling out their names. 322 00:42:28,160 --> 00:42:29,919 (Whistling) 323 00:42:30,800 --> 00:42:34,999 These signature whistles fill the ocean with glistening speech bubbles. 324 00:42:40,880 --> 00:42:44,439 It's a magical sight that has never been filmed before. 325 00:42:50,320 --> 00:42:54,599 But the wonders continue as the reason for their excitement becomes clear. 326 00:42:55,960 --> 00:42:57,959 Another super pod is approaching. 327 00:43:05,840 --> 00:43:09,359 Incredibly, the two groups start to combine. 328 00:43:10,800 --> 00:43:12,599 (Chattering) 329 00:43:15,920 --> 00:43:21,919 The numbers grow and grow until they form the greatest dolphin gathering ever seen. 330 00:43:30,880 --> 00:43:37,079 This is the legendary mega pod, made up of over 3,000 dolphins. 331 00:43:49,120 --> 00:43:53,119 Never have so many dolphins been filmed in one underwater view. 332 00:43:53,960 --> 00:43:57,239 It looks more like a vast fish shoal than a pod of dolphins. 333 00:44:03,960 --> 00:44:06,719 Dolphins can only reach these numbers in the deep ocean 334 00:44:06,880 --> 00:44:08,879 where vast fish shoals can be found. 335 00:44:12,920 --> 00:44:16,399 Here, the ocean bottom lies 3,000 metres down. 336 00:44:22,600 --> 00:44:26,439 At the surface, Spy Turtle has only just managed to catch up. 337 00:44:27,720 --> 00:44:29,359 (Whirring) 338 00:44:31,040 --> 00:44:34,439 Below, the new arrivals start to get to know each other. 339 00:44:35,520 --> 00:44:37,519 And romance blossoms everywhere. 340 00:44:40,080 --> 00:44:44,159 Unlike the bottlenose, they appear to be meeting in peaceful harmony. 341 00:45:01,880 --> 00:45:03,719 (Chattering) 342 00:45:06,080 --> 00:45:09,239 In the mega pod, it seems, free love reigns. 343 00:45:13,120 --> 00:45:17,199 And as Turtle discovers, love indeed is all around. 344 00:45:19,320 --> 00:45:23,239 A pair of Olive Ridley turtles are also caught up in the romantic mood. 345 00:45:38,080 --> 00:45:41,559 The male clasps his mate using special claws on his flippers. 346 00:45:45,840 --> 00:45:49,719 But while he's on board, the female is firmly in the driving seat. 347 00:45:59,280 --> 00:46:04,359 And when she shows an interest in Spy Turtle, there is simply nothing he can do. 348 00:46:06,240 --> 00:46:10,319 Unfortunately for him, she seems to prefer Spy Turtle. 349 00:46:24,240 --> 00:46:26,839 She strokes his face to show her interest. 350 00:46:38,880 --> 00:46:43,319 But Spy Turtle has a job to do, he's here only to observe. 351 00:46:45,480 --> 00:46:47,479 And he leaves them to it. 352 00:46:49,400 --> 00:46:52,159 The natural order is restored once more. 353 00:46:57,520 --> 00:46:59,639 There's always more dolphins to film. 354 00:47:05,040 --> 00:47:08,559 Back in Mozambique, Spy Squid is also on duty. 355 00:47:12,920 --> 00:47:16,839 He soon discovers that the male bottlenose are also in a playful mood. 356 00:47:18,800 --> 00:47:22,399 Pieces of seaweed and other trinkets plucked from the ocean floor 357 00:47:22,560 --> 00:47:24,679 often become treasured possessions. 358 00:47:27,600 --> 00:47:29,279 (Chattering) 359 00:47:37,800 --> 00:47:40,199 The more interesting they are, the better. 360 00:47:45,440 --> 00:47:50,039 And wafting fronds of sargassum seaweed are the most sought after of all. 361 00:47:55,120 --> 00:47:57,639 They delight in gathering and carrying them. 362 00:48:01,320 --> 00:48:03,719 And showing off their catching skills. 363 00:48:08,680 --> 00:48:12,679 But today, these seaweed garlands have another purpose. 364 00:48:19,000 --> 00:48:22,599 The males carry them like floral bouquets towards the females. 365 00:48:27,840 --> 00:48:32,119 The females react as before, confronting the males with a show of strength. 366 00:48:38,200 --> 00:48:42,479 The youngster may now be over a year old but his mother still shepherds him away. 367 00:48:42,640 --> 00:48:44,639 It's better to be safe than sorry. 368 00:48:46,600 --> 00:48:48,319 But something has changed. 369 00:48:48,480 --> 00:48:52,839 The males have come bearing gifts and their plan seems to be working. 370 00:48:53,960 --> 00:48:57,039 A male with a bouquet catches the eye of a young female. 371 00:48:58,040 --> 00:48:59,919 And he shows off his skills. 372 00:49:15,800 --> 00:49:17,319 She seems impressed. 373 00:49:22,040 --> 00:49:23,679 He drops the bouquet... 374 00:49:27,640 --> 00:49:29,639 ..and she catches it. 375 00:49:36,880 --> 00:49:41,239 It's now her turn to flirt, using the garland to tempt and tease. 376 00:49:47,800 --> 00:49:51,079 They may now be an item, but they won't spend much time alone. 377 00:49:58,520 --> 00:50:02,559 His mates muscle in and the female is spoilt for choice. 378 00:50:11,560 --> 00:50:14,039 No other mammal uses gifts in this way. 379 00:50:15,120 --> 00:50:20,119 It's another demonstration of their superior intelligence and refined social skills. 380 00:50:27,120 --> 00:50:29,039 The two may have planned to be alone, 381 00:50:29,200 --> 00:50:33,079 but among bottlenose, mating is rarely a private affair. 382 00:50:35,960 --> 00:50:38,799 Even the mother is swept up in the flirtatious mood... 383 00:50:53,880 --> 00:50:57,559 ..although she won't be ready to breed until her boy leaves home. 384 00:51:00,920 --> 00:51:02,519 Back in the Pacific Ocean, 385 00:51:02,680 --> 00:51:05,999 Spy Tuna is on her final mission with the spinner dolphins. 386 00:51:08,240 --> 00:51:11,039 She soon discovers another extraordinary example 387 00:51:11,200 --> 00:51:13,799 of a dolphin's cooperation and intelligence. 388 00:51:16,040 --> 00:51:18,519 Super pods like these march on their stomachs. 389 00:51:18,680 --> 00:51:23,159 And, 30 miles from shore, the deep ocean seldom disappoints. 390 00:51:25,640 --> 00:51:29,479 Their long-range sonar has detected something down below - 391 00:51:32,080 --> 00:51:34,759 a shoal of lantern fish ascending from the deep. 392 00:51:38,080 --> 00:51:41,279 By day, these fish normally live 1 ,000 metres down, 393 00:51:41,440 --> 00:51:43,639 so this is a rare sight indeed. 394 00:51:46,720 --> 00:51:51,639 Plans are quickly made and the spinners start by pushing the fish closer to the surface. 395 00:51:53,440 --> 00:51:59,159 As the dolphins hug the outside edge, the fish react as planned by moving upwards as a mass. 396 00:52:01,600 --> 00:52:03,919 More spinners add to the upward pressure. 397 00:52:08,240 --> 00:52:11,679 The huge shoal is gradually squeezed closer together. 398 00:52:17,200 --> 00:52:18,879 The spinners keep up the pressure, 399 00:52:19,040 --> 00:52:22,919 pushing the fish towards the surface and into an ever-tighter mass. 400 00:52:33,600 --> 00:52:35,679 The swirling shoal has nowhere to go. 401 00:52:36,960 --> 00:52:38,959 And now the feeding begins. 402 00:52:43,080 --> 00:52:45,759 The dolphins pick off any stragglers one by one. 403 00:52:46,440 --> 00:52:48,919 It requires hardly any effort at all. 404 00:53:07,040 --> 00:53:10,399 But in the ocean, a feast is rarely kept secret for long. 405 00:53:17,440 --> 00:53:19,959 These are giant mobula rays - 406 00:53:21,200 --> 00:53:23,399 each with a wingspan of over two metres. 407 00:53:30,760 --> 00:53:35,679 They simply open their bucket-sized mouths and scoop up a super-sized meal. 408 00:53:36,680 --> 00:53:39,079 Dozens of fish disappear in a flash. 409 00:53:49,000 --> 00:53:50,719 But this isn't their only trick. 410 00:53:50,880 --> 00:53:56,399 Their huge wings flick like a whip, stunning or killing dozens of fish with every pass. 411 00:53:58,480 --> 00:54:01,159 The following rays will trawl up the victims 412 00:54:01,320 --> 00:54:04,519 and, in turn, their wing beats create even more carnage. 413 00:54:10,240 --> 00:54:13,119 The spinners won't turn down a second course, 414 00:54:13,280 --> 00:54:15,559 especially one handed to them on a plate. 415 00:54:23,960 --> 00:54:25,959 And yet more rays keep coming. 416 00:54:41,200 --> 00:54:45,599 Together the spinners and the rays work the shoal until every stomach is full. 417 00:54:46,320 --> 00:54:48,999 Even so, they hardly dent its numbers. 418 00:54:52,160 --> 00:54:55,439 Lantern fish are the most numerous fish in the deep ocean. 419 00:54:56,040 --> 00:55:01,319 By fishing so far from land, the spinners and rays gain a rare and sumptuous meal. 420 00:55:17,200 --> 00:55:20,799 Then, as silently as they arrived, the rays are gone, 421 00:55:21,600 --> 00:55:23,679 leaving the dolphins to their games. 422 00:55:28,120 --> 00:55:32,199 Having eaten all they can, the spinners celebrate as only they know how. 423 00:55:33,600 --> 00:55:35,599 They party way into the night. 424 00:56:37,080 --> 00:56:38,639 Back in Mozambique, 425 00:56:38,800 --> 00:56:42,719 the young male bottlenose is now growing increasingly independent. 426 00:56:46,920 --> 00:56:50,999 He has learnt to succeed as a dolphin by being curious about everything. 427 00:57:02,280 --> 00:57:06,919 And when Spy Clam produces a trail of bubbles, he's instantly captivated. 428 00:57:10,600 --> 00:57:12,039 (Squeaks) 429 00:57:13,200 --> 00:57:15,759 Dolphins test everything with their mouths. 430 00:57:16,440 --> 00:57:20,399 But he soon discovers that bubbles vanish as soon as they are touched. 431 00:57:21,960 --> 00:57:23,439 (Squeaks) 432 00:57:35,360 --> 00:57:37,959 Another young friend can't resist having a go. 433 00:57:38,720 --> 00:57:44,039 Irrepressible curiosity and constant learning all adds to their exceptional intelligence. 434 00:57:51,120 --> 00:57:52,999 It's now time to move on. 435 00:57:53,160 --> 00:57:55,759 There's plenty more fun to be had in the ocean. 436 00:57:57,160 --> 00:58:01,479 Especially as a new stage of life is just beginning for the young bottlenose - 437 00:58:02,320 --> 00:58:04,519 an exciting time of independence. 438 00:58:06,800 --> 00:58:10,319 Next time, find out what happens as he sets off alone... 439 00:58:12,920 --> 00:58:16,959 ..step into the world of the orca, the greatest dolphin in the ocean 440 00:58:17,120 --> 00:58:21,039 and take the ride of your life on the back of a real-life spy dolphin... 441 00:58:21,840 --> 00:58:24,799 uncover more mysteries of the dolphins' secret lives 442 00:58:24,960 --> 00:58:30,599 and discover what happens when one of the spy creatures finally pushes his luck too far.