1 00:00:35,200 --> 00:00:37,520 The very centre of Africa. 2 00:00:42,000 --> 00:00:47,280 And the centre of two million square miles of dense tropical rain forest. 3 00:01:00,960 --> 00:01:07,560 At first glance it seems deserted and eerily still, 4 00:01:07,560 --> 00:01:10,400 not an easy place to live. 5 00:01:12,840 --> 00:01:13,880 MONKEY CHATTERS 6 00:01:20,480 --> 00:01:25,360 But in fact, there is a greater concentration of animals here 7 00:01:25,360 --> 00:01:27,960 than anywhere else in Africa. 8 00:01:33,560 --> 00:01:37,240 And in this world, they must grab every opportunity. 9 00:01:38,760 --> 00:01:43,360 Competition is intense and unrelenting. 10 00:01:43,360 --> 00:01:44,880 TREE CREAKS 11 00:01:46,760 --> 00:01:51,840 Even the forest itself fights its corner with spines 12 00:01:51,840 --> 00:01:53,040 and poisonous sap. 13 00:01:58,080 --> 00:02:02,000 Here, every living thing must fight for its space. 14 00:02:20,000 --> 00:02:21,120 Such beauty. 15 00:02:25,200 --> 00:02:27,520 But the flower is self-serving, 16 00:02:27,520 --> 00:02:31,320 enticing animals into an unwitting alliance. 17 00:02:31,320 --> 00:02:33,240 Stingless bees. 18 00:02:33,240 --> 00:02:35,400 They have to work hard. 19 00:02:35,400 --> 00:02:39,280 The forest flowers make them do so by rationing their nectar, 20 00:02:39,280 --> 00:02:42,440 forcing each bee to visit and so pollinate 21 00:02:42,440 --> 00:02:45,360 at least a thousand blooms each day. 22 00:03:01,200 --> 00:03:04,040 For the bees, it's worth the effort. 23 00:03:04,040 --> 00:03:08,560 They need the nectar to make honey, which they store in pots. 24 00:03:08,560 --> 00:03:12,560 It's so precious, they keep it hidden beneath the bark of a tree. 25 00:03:25,160 --> 00:03:26,560 But their secret is out. 26 00:03:26,560 --> 00:03:27,840 MONKEY HOWLS 27 00:03:36,680 --> 00:03:39,000 Nothing is safe in this forest. 28 00:03:56,720 --> 00:03:58,680 Chimpanzees love honey. 29 00:04:09,840 --> 00:04:12,600 She seems oblivious to danger. 30 00:04:12,600 --> 00:04:15,240 A fall from up here could be fatal. 31 00:04:18,040 --> 00:04:20,760 But she does need a bigger stick. 32 00:04:46,360 --> 00:04:50,120 Only a chimp has the ability to break into a stingless bees' 33 00:04:50,120 --> 00:04:52,320 nest as well hidden as this. 34 00:04:57,200 --> 00:05:00,040 Chimps are extremely intelligent, 35 00:05:00,040 --> 00:05:03,440 but none is born with the skill to use a tool. 36 00:05:13,880 --> 00:05:18,200 Youngsters like this one must learn by watching. 37 00:05:47,520 --> 00:05:51,080 She uses special tools, one after another, 38 00:05:51,080 --> 00:05:53,320 to get all the honey she can, 39 00:05:53,320 --> 00:05:58,440 and in a few minutes, she destroys what took the bees years to build. 40 00:06:07,440 --> 00:06:11,160 In the rainforest, nothing is safe. 41 00:06:16,880 --> 00:06:18,840 MONKEY HOWLS 42 00:06:18,840 --> 00:06:20,160 Here in the Congo, 43 00:06:20,160 --> 00:06:25,720 there can be as many as 500 trees crammed into every acre. 44 00:06:25,720 --> 00:06:28,040 In the battle for space, 45 00:06:28,040 --> 00:06:32,160 some will rise to over 60 metres high in just a few decades. 46 00:06:38,800 --> 00:06:40,480 In a valley like this, 47 00:06:40,480 --> 00:06:44,240 there could be close on 1,000 different species of tree. 48 00:06:48,280 --> 00:06:51,880 Up here, the crowns barely touch. 49 00:06:51,880 --> 00:06:55,360 Each tree seems to respect its neighbour's space. 50 00:06:59,360 --> 00:07:03,360 When they germinate down on the forest floor, young trees 51 00:07:03,360 --> 00:07:05,840 and plants are less restrained. 52 00:07:08,120 --> 00:07:11,600 But every new generation fights it out, 53 00:07:11,600 --> 00:07:14,800 in battles we can see by accelerating time. 54 00:07:16,920 --> 00:07:20,640 They must get light if they are to survive and they squeeze, 55 00:07:20,640 --> 00:07:26,080 crush and even slash one another in order to reach it. 56 00:07:46,680 --> 00:07:51,520 Despite the thick canopy above, some sunlight does filter through 57 00:07:51,520 --> 00:07:54,320 and allows a few low-light specialists 58 00:07:54,320 --> 00:07:56,240 to bloom near the forest floor. 59 00:08:25,520 --> 00:08:30,080 Down here there are animals, too, that seek out the sunlight. 60 00:08:40,440 --> 00:08:42,760 The forest's largest predator. 61 00:08:45,360 --> 00:08:47,440 A female rock python. 62 00:08:50,080 --> 00:08:55,920 Her body is five metres long, weighs 100 kilos and has 4,000 muscles 63 00:08:55,920 --> 00:09:00,240 that she uses to crush the life out of her victims. 64 00:09:02,800 --> 00:09:07,800 But right now, her need is not for food. It's for warmth. 65 00:09:14,480 --> 00:09:19,040 She finds a rare patch where a shaft of sunlight strikes the ground 66 00:09:19,040 --> 00:09:21,880 and she begins to bask. 67 00:09:25,760 --> 00:09:27,560 She's cold-blooded, 68 00:09:27,560 --> 00:09:31,280 so this is the only way she can raise the temperature of her body. 69 00:09:35,520 --> 00:09:38,120 But now she's becoming very warm indeed, 70 00:09:38,120 --> 00:09:42,040 more than ten degrees hotter than usual. 71 00:09:42,040 --> 00:09:46,200 At 40 degrees centigrade, she's in danger of killing herself. 72 00:09:50,400 --> 00:09:53,400 Just in time, she moves off. 73 00:10:00,120 --> 00:10:03,400 She disappears below ground. 74 00:10:13,800 --> 00:10:19,040 This is her nest and it's full of giant eggs. 75 00:10:23,320 --> 00:10:26,000 It's critical for the eggs development 76 00:10:26,000 --> 00:10:28,600 that they stay above 30 degrees. 77 00:10:34,240 --> 00:10:38,680 Here in this special filming burrow, she gently wraps her super-heated 78 00:10:38,680 --> 00:10:43,120 body around the eggs, passing onto them the warmth of the sun. 79 00:10:49,920 --> 00:10:53,280 She has done this every day for three months. 80 00:10:54,880 --> 00:10:59,760 The repeated heat stress on her body is so great it could be lethal, 81 00:10:59,760 --> 00:11:03,520 and at the very least, it will take three years for her to 82 00:11:03,520 --> 00:11:07,200 recover from incubating this one clutch of eggs. 83 00:11:29,160 --> 00:11:34,560 Her parchment-shelled eggs carry the pressed imprint of her scales - 84 00:11:34,560 --> 00:11:38,680 an indication of the strength of her embrace. 85 00:11:46,960 --> 00:11:49,760 At last, her efforts are rewarded. 86 00:12:07,160 --> 00:12:11,280 But the babies can't stay here. They must leave their sanctuary 87 00:12:11,280 --> 00:12:14,800 and find food in the tangled world above. 88 00:12:43,440 --> 00:12:47,120 They're over 60 centimetres long, already big enough to be 89 00:12:47,120 --> 00:12:50,200 a threat to the smaller inhabitants of the forest. 90 00:12:53,400 --> 00:12:55,800 But they are themselves vulnerable. 91 00:12:58,280 --> 00:13:00,280 Particularly to other snakes. 92 00:13:04,520 --> 00:13:06,440 But this one is their mother. 93 00:13:06,440 --> 00:13:08,160 Unusually for snakes, 94 00:13:08,160 --> 00:13:12,080 her maternal instincts continue for days after her eggs hatch. 95 00:13:23,680 --> 00:13:27,880 Even so, the forest is such a dangerous place that only 96 00:13:27,880 --> 00:13:31,800 one in 100 of her youngsters is likely to reach adulthood. 97 00:13:37,360 --> 00:13:41,080 Just occasionally,, the competition eases. 98 00:13:44,760 --> 00:13:47,760 A tree suddenly produces fruit. 99 00:13:51,480 --> 00:13:55,240 It's a magnet for the creatures of the canopy, and they, in turn, 100 00:13:55,240 --> 00:13:59,000 as they feed, create a bonanza for those on the ground below. 101 00:14:07,840 --> 00:14:09,640 CHIMP SNORTS 102 00:14:21,600 --> 00:14:23,880 A mob of red river hogs. 103 00:14:23,880 --> 00:14:25,040 HOGS SNORT AND SNIFF 104 00:14:26,880 --> 00:14:30,560 They have travelled over two miles through the thick undergrowth 105 00:14:30,560 --> 00:14:32,760 to get to this fall of fruit. 106 00:14:32,760 --> 00:14:36,720 But in the African forest, little comes for free. 107 00:14:40,400 --> 00:14:42,840 This feast is a bribe. 108 00:14:45,280 --> 00:14:48,360 The hogs will carry the seeds in their stomachs 109 00:14:48,360 --> 00:14:51,000 and deposit them far from the parent tree. 110 00:15:06,720 --> 00:15:08,080 Night falls. 111 00:15:10,120 --> 00:15:14,320 But one living community, which is neither animal nor plant 112 00:15:14,320 --> 00:15:17,440 continues its never ending work in the darkness. 113 00:15:24,960 --> 00:15:29,240 This ground is alive with fungi that digest all the litter 114 00:15:29,240 --> 00:15:30,680 discarded by the forest. 115 00:15:38,200 --> 00:15:41,440 Some rare fungi do so with enzymes that are luminous. 116 00:15:49,760 --> 00:15:53,200 The local people call them "chimpanzee fire." 117 00:15:59,360 --> 00:16:02,640 Without the fungi, the dead vegetation would pile so high 118 00:16:02,640 --> 00:16:05,600 the living trees would be submerged. 119 00:16:24,160 --> 00:16:28,880 Dawn, and a new day reveals just how much control the jungle 120 00:16:28,880 --> 00:16:31,040 has over its own environment. 121 00:16:35,440 --> 00:16:38,520 The forests of the Congo are the lungs of Africa. 122 00:16:38,520 --> 00:16:41,160 As they use the sunlight to build their tissues, 123 00:16:41,160 --> 00:16:44,920 so they release oxygen and water vapour into the air. 124 00:16:50,720 --> 00:16:54,480 Each hectare of forest produces, as vapour, 125 00:16:54,480 --> 00:16:57,800 almost 190,000 litres of water a year. 126 00:16:59,840 --> 00:17:03,080 So much that it creates its own weather. 127 00:17:06,480 --> 00:17:10,680 Clouds blanket the forest, driving up the humidity and temperature. 128 00:17:12,120 --> 00:17:14,400 A storm is brewing. 129 00:17:17,960 --> 00:17:21,680 The Congo might be the richest part of Africa, 130 00:17:21,680 --> 00:17:24,000 but it's also the most violent. 131 00:17:39,360 --> 00:17:40,400 ROARING THUNDER 132 00:17:42,840 --> 00:17:44,080 BOOMING THUNDERCLAP 133 00:17:50,680 --> 00:17:54,200 Each year, as many as 100 million lightning bolts 134 00:17:54,200 --> 00:17:55,760 strike the forest. 135 00:17:55,760 --> 00:17:58,320 That's more than anywhere else in the world. 136 00:17:58,320 --> 00:17:59,560 BOOMING THUNDERCLAP 137 00:18:05,160 --> 00:18:08,280 And with the lightning comes the rain. 138 00:18:16,320 --> 00:18:20,080 Up to 95% of the rain that falls here 139 00:18:20,080 --> 00:18:22,360 is generated by the forest itself. 140 00:18:31,600 --> 00:18:33,160 ROLLING THUNDER 141 00:18:39,840 --> 00:18:44,440 With the deluge will come change to the animals and to the forest. 142 00:18:49,440 --> 00:18:52,440 It's certainly perfect weather for frogs. 143 00:18:55,480 --> 00:18:59,200 The big storm is the cue for the most important climb 144 00:18:59,200 --> 00:19:00,640 of this frog's life. 145 00:19:02,120 --> 00:19:04,440 It's a male in search of a mate. 146 00:19:08,440 --> 00:19:12,800 But if he is to find one, he has to get to the top. 147 00:19:46,640 --> 00:19:49,280 He needs to keep his wits about him, 148 00:19:49,280 --> 00:19:51,880 for the rain also brings out hunters. 149 00:20:07,160 --> 00:20:08,200 Easy does it. 150 00:20:17,560 --> 00:20:18,960 The top, at last. 151 00:20:20,720 --> 00:20:22,840 But he's late to the party. 152 00:20:26,960 --> 00:20:28,000 FROGS CHIRP 153 00:20:33,200 --> 00:20:38,120 The higher a male sits, the further his voice will carry, 154 00:20:38,120 --> 00:20:40,840 so the top slots are worth fighting for. 155 00:21:18,280 --> 00:21:20,240 And he's won. 156 00:21:20,240 --> 00:21:21,920 He has the top place. 157 00:21:24,520 --> 00:21:27,360 So now it's time to sing. 158 00:21:27,360 --> 00:21:28,400 FROG CHIRPS 159 00:21:35,160 --> 00:21:36,800 FROG CHIRPS 160 00:21:36,800 --> 00:21:40,400 And a white-bellied female responds. 161 00:21:49,120 --> 00:21:51,600 They join together to mate. 162 00:21:59,280 --> 00:22:04,600 The loser will have to wait for the next storm before he sings again. 163 00:22:09,440 --> 00:22:13,080 She lays her eggs on a blade of a long leaf. 164 00:22:13,080 --> 00:22:16,080 And he, using his back legs, folds it over 165 00:22:16,080 --> 00:22:20,160 and glues its two edges together, shutting the eggs inside. 166 00:22:31,920 --> 00:22:36,120 This sealed nest is the safest place these leaf-folding frogs 167 00:22:36,120 --> 00:22:39,040 can find to protect their precious brood. 168 00:22:52,200 --> 00:22:55,160 Within days, the eggs are developing. 169 00:22:56,360 --> 00:22:58,280 The timing is perfect. 170 00:23:08,120 --> 00:23:11,720 The rain washes away the glue and the tadpoles slip 171 00:23:11,720 --> 00:23:14,680 out of the leaves into the growing puddles below. 172 00:23:27,280 --> 00:23:33,920 The rainy season reaches its peak and the ground has been transformed. 173 00:23:46,760 --> 00:23:49,400 The forest is flooded. 174 00:23:49,400 --> 00:23:50,960 It's a new world. 175 00:23:56,480 --> 00:23:59,720 Fish swim in from the swollen streams, 176 00:23:59,720 --> 00:24:04,360 exploiting this newly created space, snapping up the drowning insects. 177 00:24:10,440 --> 00:24:12,320 This is a butterfly fish. 178 00:24:18,880 --> 00:24:20,200 A Congo bichir. 179 00:24:25,800 --> 00:24:28,600 The hunter becomes the hunted. 180 00:24:46,360 --> 00:24:49,520 The butterfly fish is too quick and leaps out of danger. 181 00:25:21,400 --> 00:25:25,920 The floods gradually drain back into the established waterways 182 00:25:25,920 --> 00:25:28,840 that run through the forest like blood vessels. 183 00:25:32,640 --> 00:25:35,840 There is so much water flowing through the forest that even 184 00:25:35,840 --> 00:25:40,080 little rivulets can carve out the soil around an ancient boulder. 185 00:25:55,840 --> 00:25:59,600 This is the home of one forest creature that has lived 186 00:25:59,600 --> 00:26:03,760 here in the Congo for 44 million years. 187 00:26:06,640 --> 00:26:08,280 Picathartes. 188 00:26:16,440 --> 00:26:19,400 These birds mate for life, 189 00:26:19,400 --> 00:26:23,440 and the male reaffirms the bond by displaying to the female. 190 00:26:26,400 --> 00:26:29,720 They're building a mud nest on the underside of the boulder's 191 00:26:29,720 --> 00:26:32,600 overhang, where it'll be protected from the rain. 192 00:26:35,160 --> 00:26:37,120 The female takes the lead. 193 00:27:09,080 --> 00:27:11,920 The male doesn't seem quite so skilful. 194 00:27:15,560 --> 00:27:16,840 Oh, dear. 195 00:27:18,360 --> 00:27:20,840 Luckily, she can put things right. 196 00:27:27,000 --> 00:27:29,560 Now she's collecting the soft furnishings. 197 00:27:31,960 --> 00:27:35,680 He's brought some, too, but he still can't get it right. 198 00:27:43,440 --> 00:27:47,480 In the end, the female seems satisfied with the finish - 199 00:27:47,480 --> 00:27:48,920 and just in time. 200 00:27:54,920 --> 00:27:56,520 THUNDER 201 00:28:05,120 --> 00:28:09,000 It might look as if he has been banished into the rain, 202 00:28:09,000 --> 00:28:11,520 but in fact, they're a great team. 203 00:28:13,800 --> 00:28:16,240 They share the incubation, 204 00:28:16,240 --> 00:28:20,320 12 hours on, 12 hours off, for the next three weeks. 205 00:28:26,240 --> 00:28:29,360 In due course, there are mouths to feed, 206 00:28:29,360 --> 00:28:32,960 and now the male must prove his worth. 207 00:28:47,440 --> 00:28:50,360 Worms are a good start, and he's doing well. 208 00:28:52,280 --> 00:28:54,400 But the chicks are insatiable. 209 00:29:02,080 --> 00:29:05,480 Fortunately, other things are on the menu. 210 00:29:20,440 --> 00:29:24,680 He might be a poor nest-builder. 211 00:29:24,680 --> 00:29:27,000 But he is redeeming himself now. 212 00:29:30,840 --> 00:29:32,000 Domestic bliss! 213 00:29:35,640 --> 00:29:39,080 Rocky overhangs are the only place where Picathartes 214 00:29:39,080 --> 00:29:40,720 will build their nest, 215 00:29:40,720 --> 00:29:44,200 so they owe their home to the stream that revealed 216 00:29:44,200 --> 00:29:46,040 the flank of the giant boulder. 217 00:29:52,640 --> 00:29:55,200 This stream and countless others like it 218 00:29:55,200 --> 00:29:58,920 merge to form the great rivers of Central Africa. 219 00:30:10,920 --> 00:30:15,160 More than 450 billion litres of rainwater, 220 00:30:15,160 --> 00:30:18,840 travelling down thousands of rivers, are heading west. 221 00:30:23,200 --> 00:30:26,680 The waters pick up speed as the rivers spill over the edge 222 00:30:26,680 --> 00:30:31,440 of the central plateau and create giant cascades of white water. 223 00:30:58,840 --> 00:31:02,720 The Kongou forces its way through the wildest, most untouched 224 00:31:02,720 --> 00:31:05,400 forest in the whole of Africa. 225 00:31:48,920 --> 00:31:53,120 The Congo river system drains an area the size of India, 226 00:31:53,120 --> 00:31:56,200 carrying the waters westwards towards the Atlantic. 227 00:31:58,040 --> 00:32:01,760 But before it reaches the coast, the rivers broaden, 228 00:32:01,760 --> 00:32:03,280 forcing back the forest. 229 00:32:08,800 --> 00:32:11,280 And here for the first time, there is space. 230 00:32:12,720 --> 00:32:15,560 Wide, flat and safe. 231 00:32:18,520 --> 00:32:22,040 These stretches of sand attract visitors from the coast. 232 00:32:23,560 --> 00:32:27,600 Skimmers searching for somewhere safe to settle. 233 00:32:39,200 --> 00:32:44,080 The lower mandible of their beaks is greatly elongated. 234 00:32:44,080 --> 00:32:49,400 They slice it through the surface of the water at ten metres a second. 235 00:32:53,200 --> 00:32:56,160 If and when it hits a tiny fish, it'll snap shut. 236 00:33:04,240 --> 00:33:07,400 But why come up river to these open sand flats? 237 00:33:13,400 --> 00:33:15,280 This is the answer. 238 00:33:15,280 --> 00:33:16,320 BABY BIRD CHIRPS 239 00:33:25,800 --> 00:33:29,760 But this nursery will not exist for long. 240 00:33:29,760 --> 00:33:33,160 Four weeks from now, it'll be under ten metres of water. 241 00:33:35,040 --> 00:33:38,840 If by then these chicks can't fly, they will drown. 242 00:33:43,600 --> 00:33:47,120 The problem for young skimmers is that when they hatch, 243 00:33:47,120 --> 00:33:50,440 the lower part of their beaks is the same size as the upper. 244 00:33:53,160 --> 00:33:55,080 While they wait for it to grow, 245 00:33:55,080 --> 00:33:58,240 they do their best to learn the skimming technique. 246 00:34:50,320 --> 00:34:51,560 THUNDER 247 00:35:05,920 --> 00:35:08,720 Open spaces may be safe, 248 00:35:08,720 --> 00:35:11,880 but they give no protection against the driving rain. 249 00:35:27,960 --> 00:35:31,800 These storms are a warning that the skimmers must soon leave. 250 00:35:33,560 --> 00:35:36,000 The river is already rising. 251 00:35:50,720 --> 00:35:52,840 This year the chicks get away in time. 252 00:36:14,240 --> 00:36:17,280 It's not just water that has the power to clear a way 253 00:36:17,280 --> 00:36:18,600 through the forest. 254 00:36:20,760 --> 00:36:23,560 There are animals that could do that too. 255 00:36:27,000 --> 00:36:30,200 They have created a network of pathways that criss-cross 256 00:36:30,200 --> 00:36:33,120 the lowland forest and run for thousands of miles 257 00:36:33,120 --> 00:36:34,320 in all directions. 258 00:36:37,240 --> 00:36:39,080 CACOPHONY OF ANIMAL SOUNDS 259 00:36:59,120 --> 00:37:01,880 These path-makers are surprisingly stealthy. 260 00:37:03,640 --> 00:37:09,360 But as night falls, there's a chance of catching a glimpse of them. 261 00:37:09,360 --> 00:37:10,400 ROAR 262 00:37:20,080 --> 00:37:21,200 ELEPHANT TRUMPETS 263 00:37:22,880 --> 00:37:23,920 ELEPHANT ROARS 264 00:37:27,280 --> 00:37:30,360 Forest elephants are very social creatures, 265 00:37:30,360 --> 00:37:34,400 but in dense jungle it's hard for them to find one another. 266 00:37:41,480 --> 00:37:43,080 These elephants are lucky. 267 00:37:46,480 --> 00:37:49,640 Here in the Congo, there is one special place 268 00:37:49,640 --> 00:37:51,480 where they can meet and mingle. 269 00:37:54,440 --> 00:37:58,320 A place that the elephants have created for themselves. 270 00:38:01,760 --> 00:38:03,720 And this is it. 271 00:38:11,120 --> 00:38:12,160 ROARING 272 00:38:18,920 --> 00:38:23,960 Dzanga-Bai, the legendary "village of elephants". 273 00:38:25,880 --> 00:38:27,280 BABY ELEPHANT TRUMPETS 274 00:38:30,120 --> 00:38:32,440 ELEPHANTS ROAR AND TRUMPET 275 00:38:39,800 --> 00:38:44,560 As well as being a place where they can enjoy one another's company, 276 00:38:44,560 --> 00:38:49,800 this great clearing satisfies another craving... 277 00:38:49,800 --> 00:38:51,280 for salts. 278 00:38:57,480 --> 00:38:59,680 ELEPHANTS TRUMPET 279 00:39:00,920 --> 00:39:03,440 The salts lie deep under the mud, 280 00:39:03,440 --> 00:39:06,320 so the elephants have got to mine for them, 281 00:39:06,320 --> 00:39:10,240 which they do with high pressure water jets from their trunks. 282 00:39:29,880 --> 00:39:31,920 The precious salts 283 00:39:31,920 --> 00:39:36,560 and the chance to socialise bring in elephants from far and wide. 284 00:39:40,200 --> 00:39:46,000 If an elephant is in the mood to mate, this is the place to be. 285 00:39:46,000 --> 00:39:47,640 ELEPHANT TRUMPETS 286 00:39:47,640 --> 00:39:52,320 This young bull is in a state of musth, a kind of sexual fury. 287 00:39:52,320 --> 00:39:53,440 ELEPHANT TRUMPETS 288 00:40:11,200 --> 00:40:14,960 He is so pumped up by hormones and the excitements of the crowd 289 00:40:14,960 --> 00:40:17,600 that he seems to have taken leave of his senses. 290 00:40:38,600 --> 00:40:40,320 ELEPHANT TRUMPETS 291 00:40:41,760 --> 00:40:44,920 But will throwing his weight about impress the females? 292 00:40:44,920 --> 00:40:46,880 ELEPHANT TRUMPETS 293 00:40:47,920 --> 00:40:51,480 The cows only become fertile once every two years. 294 00:40:51,480 --> 00:40:55,840 So opportunities to encounter one at the right time are not common. 295 00:40:55,840 --> 00:41:00,520 This could well be the first chance this young male has had. 296 00:41:03,400 --> 00:41:04,440 He's lucky. 297 00:41:04,440 --> 00:41:08,440 And there are no older bulls around to put him in his place. 298 00:41:19,400 --> 00:41:23,440 Just for a moment, he is king of the bai. 299 00:41:33,200 --> 00:41:34,520 ELEPHANT TRUMPETS 300 00:41:53,320 --> 00:41:56,120 But his rule doesn't last for long. 301 00:41:57,360 --> 00:41:59,800 Enter another lusty bull. 302 00:42:02,720 --> 00:42:04,160 And a much bigger one. 303 00:42:13,760 --> 00:42:17,720 But the young bull is still charged up with testosterone. 304 00:42:18,760 --> 00:42:21,840 Bold or foolish, he's going into battle. 305 00:43:18,480 --> 00:43:20,880 He never really had a chance. 306 00:43:36,400 --> 00:43:39,400 Dzanga-bai is a huge clearing, 307 00:43:39,400 --> 00:43:44,240 but it's still just a speck in this vast expanse of green. 308 00:43:46,880 --> 00:43:50,360 Elephants might fell trees and carve pathways, 309 00:43:50,360 --> 00:43:54,800 but nothing natural can hold back this forest for ever. 310 00:43:57,200 --> 00:44:00,040 Nothing but the Atlantic Ocean. 311 00:44:18,920 --> 00:44:22,600 Loango Beach, on Africa's west coast - 312 00:44:22,600 --> 00:44:25,040 one of the last truly wild places 313 00:44:25,040 --> 00:44:28,000 where the Congo jungle meets the sea. 314 00:44:39,800 --> 00:44:46,360 Here, the forest gives way to sand, surf and fresh sea air. 315 00:44:46,360 --> 00:44:53,200 The cool breezes and warm sunlight 316 00:44:53,200 --> 00:44:56,840 entice creatures out of the dark forest. 317 00:44:56,840 --> 00:44:58,120 LOWING 318 00:44:58,120 --> 00:45:00,800 Forest buffalo appear first. 319 00:45:19,720 --> 00:45:22,440 And here in the surf... 320 00:45:22,440 --> 00:45:23,720 there are hippo. 321 00:45:32,720 --> 00:45:37,760 Spray blows in from the sea, making the grass salty. 322 00:45:51,960 --> 00:45:55,520 So here elephants can get their tasty salt 323 00:45:55,520 --> 00:45:57,280 without having to dig for it. 324 00:46:00,360 --> 00:46:04,720 This mother with her tiny baby can feel the sun on her back. 325 00:46:04,720 --> 00:46:07,520 Here, it's safe for her little one. 326 00:46:08,840 --> 00:46:11,880 They're free to eat in peace. 327 00:46:13,840 --> 00:46:16,760 The bulls have all the room they need. 328 00:46:16,760 --> 00:46:18,800 So there is less risk of a fight. 329 00:46:32,520 --> 00:46:36,160 Everyone, from gorillas to forest hogs, 330 00:46:36,160 --> 00:46:39,720 ventures out to relax on the beach. 331 00:46:39,720 --> 00:46:41,160 BOAR GRUNT 332 00:47:15,720 --> 00:47:18,920 But the forest creatures can't stay out here forever. 333 00:47:23,440 --> 00:47:25,160 Despite everything - 334 00:47:25,160 --> 00:47:29,200 the intense competition, the threats, the darkness - 335 00:47:29,200 --> 00:47:35,200 they need their forest, just as their forest needs them. 336 00:47:37,360 --> 00:47:38,640 ELEPHANT TRUMPETS 337 00:48:03,720 --> 00:48:05,400 The Congo rainforest. 338 00:48:05,400 --> 00:48:08,400 A four-day journey to the heart of Africa. 339 00:48:11,360 --> 00:48:14,240 Once the plane leaves, you're on your own. 340 00:48:16,560 --> 00:48:20,680 This expedition planned to film two of the Congo's best-kept secrets. 341 00:48:20,680 --> 00:48:22,600 But to even find them, 342 00:48:22,600 --> 00:48:26,120 the crew would have to work very hard indeed. 343 00:48:26,120 --> 00:48:28,120 You might as well be on a different planet 344 00:48:28,120 --> 00:48:30,760 coming to a place like this, Planet Congo. 345 00:48:34,520 --> 00:48:36,760 Mysterious... 346 00:48:37,760 --> 00:48:39,600 ..difficult... 347 00:48:39,600 --> 00:48:41,640 complex... 348 00:48:41,640 --> 00:48:43,440 challenging. 349 00:48:45,160 --> 00:48:48,520 'You know, everything's trying to bite you.' 350 00:48:49,640 --> 00:48:50,920 Suck your blood. 351 00:48:53,560 --> 00:48:57,600 It's like being tickled by a million feathers at the same time. 352 00:48:57,600 --> 00:48:59,360 HE LAUGHS 353 00:48:59,360 --> 00:49:00,800 HE SIGHS 354 00:49:06,800 --> 00:49:10,720 The insects might be torture, but that's the least of their worries. 355 00:49:13,480 --> 00:49:17,720 The only way to get deep into the jungle is to follow these trails. 356 00:49:18,840 --> 00:49:22,080 Trails made by dangerous forest elephants. 357 00:49:23,360 --> 00:49:27,120 'Well, the first thing you need to know about the forest elephant is, 358 00:49:27,120 --> 00:49:29,760 'you don't want to meet one.' 359 00:49:29,760 --> 00:49:32,400 Cos running away can elicit a charge, 360 00:49:32,400 --> 00:49:35,440 'and it could be exactly the wrong thing to do.' 361 00:49:36,440 --> 00:49:40,240 Our team are completely dependent on their Bayaka guides for safety. 362 00:49:44,200 --> 00:49:46,560 WHISPERS: 363 00:49:50,560 --> 00:49:54,400 But it's these same forest elephants that James has come to film. 364 00:49:54,400 --> 00:49:56,480 And just to make the challenge harder, 365 00:49:56,480 --> 00:49:59,000 he's here to film them in the dark. 366 00:50:01,560 --> 00:50:04,320 Nobody knows exactly what they get up to at night - 367 00:50:04,320 --> 00:50:07,120 they haven't been filmed like this before. 368 00:50:10,880 --> 00:50:13,920 I couldn't rig this place if the Bayaka weren't here. 369 00:50:13,920 --> 00:50:16,440 Watching my back, really. 370 00:50:16,440 --> 00:50:19,160 James needs to operate the remote cameras 371 00:50:19,160 --> 00:50:21,320 from somewhere out of the elephants' reach. 372 00:50:27,400 --> 00:50:30,400 A tree platform seems like the best option. 373 00:50:35,560 --> 00:50:38,360 Apparently, they have very big elephants round here. 374 00:50:38,360 --> 00:50:41,120 They want us to put it a bit higher, so... 375 00:50:41,120 --> 00:50:42,800 I think I'll do what they say. 376 00:50:44,160 --> 00:50:46,720 But no-one wants to stay out at night 377 00:50:46,720 --> 00:50:48,560 and help James with the filming. 378 00:50:58,440 --> 00:51:01,360 So James will be alone until morning. 379 00:51:01,360 --> 00:51:04,040 If anything goes wrong, he's on his own. 380 00:51:04,040 --> 00:51:06,840 If they really wanted to, they could push these trees over. 381 00:51:06,840 --> 00:51:09,400 I can't imagine that's going to be an issue. 382 00:51:11,680 --> 00:51:13,840 As James settled down for the night, 383 00:51:13,840 --> 00:51:17,440 he's got no idea of the trouble that's coming his way. 384 00:51:26,600 --> 00:51:27,800 What's going on? 385 00:51:27,800 --> 00:51:32,040 20 miles away, Mark MacEwen is also up in the middle of the night. 386 00:51:32,040 --> 00:51:36,360 The animal he's after is proving impossible to find. 387 00:51:36,360 --> 00:51:37,400 Ah... 388 00:51:38,920 --> 00:51:43,240 So we get up in the darkness and we walk through the jungle at night, 389 00:51:43,240 --> 00:51:46,320 hoping to hear the sound of cracking branches 390 00:51:46,320 --> 00:51:49,200 or leaves moving up in the trees. 391 00:51:49,200 --> 00:51:52,600 That means chimpanzees are stirring in the treetops, 392 00:51:52,600 --> 00:51:55,600 and Mark is here to film chimps hunting for honey. 393 00:51:57,680 --> 00:52:00,400 There's one chimp in particular he needs to find - 394 00:52:00,400 --> 00:52:03,000 a teenager with a very sweet tooth, 395 00:52:03,000 --> 00:52:06,760 known to go further in the pursuit of a bees' nest than any other. 396 00:52:11,080 --> 00:52:15,240 I've spent six days walking, 397 00:52:15,240 --> 00:52:21,000 probably the equivalent of a half marathon every day in 100% humidity, 398 00:52:21,000 --> 00:52:24,720 and about 95 degrees in the shade. 399 00:52:24,720 --> 00:52:27,560 And we just can't find our chimpanzee. 400 00:52:30,560 --> 00:52:34,560 Time is ticking away, and Mark is running out of filming days. 401 00:52:40,960 --> 00:52:43,000 At the moment, I just need some good luck. 402 00:52:43,000 --> 00:52:45,520 We've come an awfully long way to get this sequence. 403 00:52:45,520 --> 00:52:48,280 We've got probably 10, 12 days left. 404 00:52:50,000 --> 00:52:51,920 But it's hard work at the moment. 405 00:52:51,920 --> 00:52:56,600 All Mark can do is persevere, and hope for a break. 406 00:53:02,200 --> 00:53:04,640 But not all the forest creatures are so shy. 407 00:53:06,160 --> 00:53:09,560 Perched high in his tree, James Aldred is waiting patiently 408 00:53:09,560 --> 00:53:11,080 for the elephants to come in. 409 00:53:13,960 --> 00:53:15,920 GROWLING 410 00:53:16,960 --> 00:53:19,600 At last, the elephants are here, 411 00:53:19,600 --> 00:53:21,640 but they're behaving strangely. 412 00:53:29,400 --> 00:53:32,920 (He knows something's not quite right.) 413 00:53:32,920 --> 00:53:36,280 The elephants seem agitated. 414 00:53:43,640 --> 00:53:45,560 They just want to get rid of you. 415 00:53:47,000 --> 00:53:49,720 One begins to thump the tree with its head. 416 00:53:49,720 --> 00:53:52,120 CRASHING 417 00:53:52,120 --> 00:53:54,680 James has no option but to weather the attack. 418 00:53:57,720 --> 00:53:59,080 CRASHING 419 00:53:59,080 --> 00:54:01,240 "Let's lean forward and keep head-butting, 420 00:54:01,240 --> 00:54:03,560 "keep head-butting, keep head-butting." 421 00:54:06,400 --> 00:54:08,240 Suddenly, the cameras cut out. 422 00:54:10,200 --> 00:54:13,040 And James is left in complete darkness. 423 00:54:16,800 --> 00:54:21,760 After three weeks searching, Mark has lost nearly two stone in weight, 424 00:54:21,760 --> 00:54:24,520 but he hasn't given up. 425 00:54:24,520 --> 00:54:27,800 He can't afford to put down his camera for a second. 426 00:54:29,480 --> 00:54:32,800 Suddenly, the guide spots the honey hunter. 427 00:54:32,800 --> 00:54:34,440 This is it. 428 00:54:51,600 --> 00:54:52,960 (Where is she?) 429 00:54:52,960 --> 00:54:54,400 (She's inside the tree.) 430 00:54:59,920 --> 00:55:02,600 Just for some honey, she's risking her life. 431 00:55:02,600 --> 00:55:03,800 It's amazing. 432 00:55:23,960 --> 00:55:25,880 'Well, I think I just couldn't stop smiling' 433 00:55:25,880 --> 00:55:29,120 for several days after filming. The relief was just unbelievable. 434 00:55:38,440 --> 00:55:42,920 Back at the camera platform, James has had a long night. 435 00:55:44,520 --> 00:55:48,840 For over four hours, the elephant tried to shake him out of the tree. 436 00:55:53,040 --> 00:55:56,000 Got down this morning when the Bayaka came to collect me, 437 00:55:56,000 --> 00:55:59,120 went to look at the camera, and he'd pulled it out of the tree, 438 00:55:59,120 --> 00:56:01,080 and he'd chewed through the power cable. 439 00:56:02,240 --> 00:56:06,080 He must have gotten a bit of a shock, I mean only 12 volts, but... 440 00:56:06,080 --> 00:56:09,000 Serves him right, quite honestly. HE LAUGHS 441 00:56:09,000 --> 00:56:13,280 But at least we got a shot of him before he trashed the camera. 442 00:56:13,280 --> 00:56:14,600 HE LAUGHS 443 00:56:14,600 --> 00:56:15,800 Silver lining. 444 00:56:17,280 --> 00:56:21,960 Despite this bumpy start, the elephants soon got used to James, 445 00:56:21,960 --> 00:56:24,360 and James got used to the elephants. 446 00:56:24,360 --> 00:56:28,680 Filming here was never going to be easy, 447 00:56:28,680 --> 00:56:32,440 but we were soon able to reveal the night life of forest elephants 448 00:56:32,440 --> 00:56:34,240 like never before. 449 00:56:35,440 --> 00:56:37,960 GROWLING 450 00:56:51,920 --> 00:56:55,520 Next time, Africa's Great Cape. 451 00:56:58,360 --> 00:57:03,480 Where a land of mountains and deserts is flanked by two coasts. 452 00:57:07,240 --> 00:57:13,240 Only in this part of Africa do powerful oceanic forces combine 453 00:57:13,240 --> 00:57:15,520 in such a riotous explosion of life. 454 00:57:37,920 --> 00:57:40,960 Subtitles by Red Bee Media Ltd