1 00:00:12,683 --> 00:00:16,083 We have always been strangers to the night. 2 00:00:19,283 --> 00:00:22,043 It's a world our eyes cannot penetrate. 3 00:00:27,483 --> 00:00:29,883 A place of unnerving sounds... 4 00:00:32,883 --> 00:00:34,803 ...and imagined terrors. 5 00:00:38,043 --> 00:00:39,043 But now... 6 00:00:39,403 --> 00:00:40,763 for the first time... 7 00:00:42,043 --> 00:00:44,643 we can lift the veil of darkness. 8 00:00:56,883 --> 00:00:58,443 From secret jungles... 9 00:01:02,963 --> 00:01:04,843 to frozen kingdoms... 10 00:01:09,083 --> 00:01:10,243 ...new technology... 11 00:01:11,643 --> 00:01:14,723 allows us to reveal rarely seen creatures... 12 00:01:19,283 --> 00:01:20,563 and hidden dramas. 13 00:01:26,643 --> 00:01:29,163 In every place on Earth... 14 00:01:32,883 --> 00:01:34,323 when the light fades... 15 00:01:36,043 --> 00:01:38,243 new worlds awake. 16 00:01:56,283 --> 00:01:58,563 As the day draws to a close, 17 00:01:59,643 --> 00:02:02,083 darkness races across the planet... 18 00:02:03,083 --> 00:02:05,643 at over 1,000 kilometers an hour. 19 00:02:22,523 --> 00:02:25,403 From now until the break of dawn... 20 00:02:28,363 --> 00:02:31,163 every hour brings unique challenges. 21 00:02:36,643 --> 00:02:41,123 And every creature on Earth must find a way to make it through the night. 22 00:02:59,803 --> 00:03:02,123 The Semien mountains in Ethiopia. 23 00:03:05,763 --> 00:03:07,723 Darkness is almost here. 24 00:03:15,283 --> 00:03:19,883 After a long, hot day, this male gelada must gather his troop. 25 00:03:22,883 --> 00:03:25,563 These mountaintops won't be safe for much longer. 26 00:03:27,363 --> 00:03:30,363 Hyenas and leopards will soon be on the hunt. 27 00:03:36,683 --> 00:03:39,163 In the open, the geladas are vulnerable. 28 00:03:42,603 --> 00:03:45,923 Safety lies 100 meters over the cliff edge. 29 00:03:58,003 --> 00:04:02,243 Even the smallest must make the journey if they are to survive the night. 30 00:04:09,563 --> 00:04:11,243 A slip could be fatal. 31 00:04:14,563 --> 00:04:19,163 The old male's extra size means he's far less agile than the rest. 32 00:04:37,883 --> 00:04:39,203 The darker it gets, 33 00:04:39,763 --> 00:04:41,483 the higher the risk of falling. 34 00:04:51,363 --> 00:04:52,443 They've made it. 35 00:05:01,163 --> 00:05:03,003 As they settle down for the night, 36 00:05:04,003 --> 00:05:06,043 geladas lick at the cliff wall... 37 00:05:08,723 --> 00:05:12,123 adding vital minerals to their limited vegetarian diet. 38 00:05:14,283 --> 00:05:16,323 A behavior never recorded before. 39 00:05:24,283 --> 00:05:25,963 This precarious resting place 40 00:05:26,043 --> 00:05:30,003 should be enough to protect the geladas from the danger of the darkness. 41 00:05:33,443 --> 00:05:34,443 For others... 42 00:05:35,363 --> 00:05:36,963 night brings protection. 43 00:05:38,043 --> 00:05:39,723 And it can't come soon enough. 44 00:05:47,763 --> 00:05:52,563 As the light slowly fades over Texas, some are getting impatient. 45 00:05:58,883 --> 00:06:00,843 Hiding in this cave 46 00:06:00,923 --> 00:06:05,243 is the largest concentration of mammals anywhere on Earth. 47 00:06:21,243 --> 00:06:24,083 Twenty million free-tailed bats. 48 00:06:29,483 --> 00:06:32,243 All waiting for the cover of night. 49 00:06:37,563 --> 00:06:42,323 But the nearest places to feed may be over 100 kilometers away. 50 00:06:46,163 --> 00:06:50,403 It's not possible to make the round trip within the hours of darkness, 51 00:06:50,483 --> 00:06:52,323 so they have to brave the light. 52 00:06:57,643 --> 00:06:59,523 And the waiting raptors. 53 00:07:26,643 --> 00:07:28,763 Superior vision and maneuverability 54 00:07:29,283 --> 00:07:32,403 give hawks and falcons the advantage in the day. 55 00:07:38,883 --> 00:07:42,683 These bats are adapted for fast, long-distance flights, 56 00:07:43,323 --> 00:07:45,003 not aerobatics. 57 00:08:02,283 --> 00:08:04,723 Their only defense is numbers. 58 00:08:28,123 --> 00:08:30,083 Overwhelming their predators, 59 00:08:30,643 --> 00:08:33,603 the vast majority will make it to their feeding grounds. 60 00:08:38,763 --> 00:08:39,763 But not all. 61 00:08:52,723 --> 00:08:56,803 The exodus of millions of bats continues for hours. 62 00:09:14,483 --> 00:09:18,003 Finally, the sun slips below the horizon, 63 00:09:19,723 --> 00:09:22,283 taking the last rays of light with it. 64 00:09:32,163 --> 00:09:33,003 Darkness. 65 00:09:36,363 --> 00:09:37,643 But not complete. 66 00:09:48,043 --> 00:09:53,363 The light of the full moon is 400,000 times dimmer than the sun. 67 00:10:02,843 --> 00:10:05,003 Our eyes struggle to see. 68 00:10:10,723 --> 00:10:12,123 But a low-light camera... 69 00:10:14,763 --> 00:10:17,323 reveals a hidden nighttime world. 70 00:10:20,123 --> 00:10:22,603 Still very much awake. 71 00:10:31,843 --> 00:10:33,283 Zimbabwe. 72 00:10:35,483 --> 00:10:38,323 It's the end of a long, hot dry season. 73 00:10:40,163 --> 00:10:42,843 Daytime temperatures are topping 40 Celsius. 74 00:10:48,243 --> 00:10:50,043 Night brings relief. 75 00:10:51,563 --> 00:10:53,723 It's down to a manageable 22. 76 00:11:05,163 --> 00:11:10,243 This elephant family must find drinking water before the sun returns. 77 00:11:15,883 --> 00:11:20,363 Traveling far by day, for the newborn calf, is exhausting. 78 00:11:30,003 --> 00:11:34,123 They must cover as much distance as possible while it's cool. 79 00:11:36,523 --> 00:11:39,083 But night is a mixed blessing. 80 00:11:42,643 --> 00:11:44,003 It brings out predators. 81 00:11:49,403 --> 00:11:52,603 Lions are primarily nocturnal hunters. 82 00:11:56,163 --> 00:11:58,363 Eyes sensitive to the faintest light... 83 00:12:00,763 --> 00:12:03,203 give them the edge over their prey. 84 00:12:08,963 --> 00:12:11,483 Elephants see better than we do in the dark, 85 00:12:12,643 --> 00:12:14,563 but nowhere as well as a lion. 86 00:12:26,683 --> 00:12:30,883 Led by the oldest female, the herd keep the little ones moving. 87 00:12:38,643 --> 00:12:40,323 Storm clouds are brewing... 88 00:12:42,763 --> 00:12:44,043 obscuring the moon. 89 00:13:03,803 --> 00:13:07,643 Aside from flashes of lightning, it's now pitch black. 90 00:13:12,163 --> 00:13:13,843 The elephants can barely see. 91 00:13:18,483 --> 00:13:22,643 Now, their safety relies on hearing and smell. 92 00:13:32,723 --> 00:13:34,923 They can sense lions are out there, 93 00:13:38,323 --> 00:13:40,643 but can't see where exactly. 94 00:13:57,523 --> 00:13:59,323 Elephants are dominant by day. 95 00:14:01,323 --> 00:14:02,363 But at night... 96 00:14:03,883 --> 00:14:05,123 the tables turn. 97 00:14:13,203 --> 00:14:15,643 The newborn is especially vulnerable. 98 00:14:20,083 --> 00:14:21,883 She needs her family's protection. 99 00:14:48,523 --> 00:14:50,763 In the confusion, they scatter. 100 00:15:17,403 --> 00:15:19,483 A female is cut off from the others. 101 00:15:25,363 --> 00:15:27,083 Left alone in the darkness. 102 00:15:50,083 --> 00:15:51,923 The eastern United States. 103 00:15:52,563 --> 00:15:54,563 Two hours after sunset... 104 00:16:01,563 --> 00:16:03,723 and magic is in the air. 105 00:16:18,803 --> 00:16:20,083 Fireflies. 106 00:16:42,803 --> 00:16:45,203 Most fireflies flash their lights. 107 00:16:46,523 --> 00:16:51,243 But low-light cameras reveal a species with a different approach. 108 00:17:03,083 --> 00:17:05,443 These are blue ghosts. 109 00:17:10,403 --> 00:17:12,883 Amorous males searching for a mate. 110 00:17:16,483 --> 00:17:18,243 Whilst others only twinkle, 111 00:17:18,843 --> 00:17:22,683 these can glow continuously for up to a minute. 112 00:17:38,283 --> 00:17:41,843 Their light is a signal to wingless females on the ground. 113 00:17:51,043 --> 00:17:53,403 She's the size of a grain of rice. 114 00:17:57,203 --> 00:17:59,843 But her glow is just enough... 115 00:18:00,683 --> 00:18:02,003 for males to find her. 116 00:18:12,163 --> 00:18:13,723 Time to breed is short. 117 00:18:15,043 --> 00:18:18,763 The mesmerizing display only lasts for a few weeks. 118 00:18:34,163 --> 00:18:38,603 They turn off their lights, affording a little privacy from the competition. 119 00:19:02,483 --> 00:19:03,563 Mating over, 120 00:19:04,083 --> 00:19:06,883 she now heads underground to lay her eggs... 121 00:19:10,003 --> 00:19:13,683 ensuring the blue ghosts' show will return next year. 122 00:19:28,443 --> 00:19:29,963 In the fjords of Norway, 123 00:19:30,443 --> 00:19:33,203 the hours of twilight have long since passed. 124 00:19:40,963 --> 00:19:42,763 Herring are on the move. 125 00:19:43,563 --> 00:19:47,443 It should be safer now, under the cover of darkness. 126 00:19:54,603 --> 00:19:55,763 But not tonight. 127 00:20:08,483 --> 00:20:12,563 Trawlers can scoop up hundreds of tons in a single trip. 128 00:20:35,083 --> 00:20:36,483 And all this activity... 129 00:20:37,763 --> 00:20:39,243 doesn't go unnoticed. 130 00:20:43,563 --> 00:20:45,003 These inky waters... 131 00:20:46,363 --> 00:20:47,363 ...are patrolled... 132 00:20:48,123 --> 00:20:49,203 by orcas. 133 00:20:54,483 --> 00:20:56,283 They've heard the sound of boats... 134 00:21:02,723 --> 00:21:05,683 and learned that it means opportunity. 135 00:21:19,483 --> 00:21:25,843 Normally, they would use echolocation, natural sonar, to catch fish in the dark. 136 00:21:30,083 --> 00:21:32,923 But here, they've found an easier way. 137 00:21:36,443 --> 00:21:38,283 They make use of the lights. 138 00:21:41,283 --> 00:21:43,323 Some fish escape the nets. 139 00:21:44,203 --> 00:21:47,243 But disoriented and separated from the shoal, 140 00:21:48,163 --> 00:21:49,603 they're easy pickings. 141 00:22:14,643 --> 00:22:16,723 Seven-ton predators... 142 00:22:17,563 --> 00:22:19,043 show their delicate side. 143 00:22:55,803 --> 00:23:00,843 Orcas are among the most intelligent and social creatures in the ocean. 144 00:23:13,003 --> 00:23:16,883 And our night cameras reveal what may be new behavior. 145 00:23:20,403 --> 00:23:21,483 Bubble signals. 146 00:23:25,403 --> 00:23:26,443 In the lights, 147 00:23:26,963 --> 00:23:28,763 the bubbles act as a beacon... 148 00:23:31,723 --> 00:23:34,923 leading other members of the family to a meal. 149 00:24:25,683 --> 00:24:26,723 In Zimbabwe... 150 00:24:28,643 --> 00:24:31,763 the night has brought tragedy to the elephant family. 151 00:24:38,643 --> 00:24:42,003 The isolated female lost her battle with the lions. 152 00:24:49,963 --> 00:24:51,443 There's no time to mourn. 153 00:24:53,803 --> 00:24:56,443 The family must move on and find water. 154 00:25:05,523 --> 00:25:08,243 They've been walking for over four hours. 155 00:25:09,683 --> 00:25:11,443 The young ones are getting thirsty. 156 00:25:12,243 --> 00:25:14,803 The newborn is totally exhausted. 157 00:25:18,443 --> 00:25:21,443 But the matriarch knows they're close to water. 158 00:25:28,483 --> 00:25:29,683 She can smell it. 159 00:25:43,203 --> 00:25:45,083 They're within touching distance... 160 00:25:47,083 --> 00:25:49,243 when danger threatens once more. 161 00:25:56,363 --> 00:25:57,443 Hyenas. 162 00:26:06,163 --> 00:26:10,203 By day, their eyesight is as good as an elephant's. 163 00:26:13,523 --> 00:26:14,523 After dark, 164 00:26:15,323 --> 00:26:17,443 it's much, much better. 165 00:26:20,563 --> 00:26:22,683 The newborn must be protected. 166 00:26:29,563 --> 00:26:32,323 One wrong move and the hyenas will grab her. 167 00:26:38,283 --> 00:26:41,243 Shrieks in the darkness alert everyone to the danger. 168 00:26:59,563 --> 00:27:02,603 The hyenas do their best to create panic. 169 00:27:27,603 --> 00:27:29,683 But the elephants' distress calls... 170 00:27:31,243 --> 00:27:32,243 have been heard. 171 00:27:44,763 --> 00:27:47,363 Extended family to the rescue. 172 00:28:07,003 --> 00:28:09,803 The herd can finally quench their thirst. 173 00:28:21,083 --> 00:28:22,923 With strong family bonds, 174 00:28:23,003 --> 00:28:28,123 these young elephants have overcome the challenges of the darkest hours. 175 00:28:39,883 --> 00:28:40,883 But for others, 176 00:28:42,043 --> 00:28:43,763 the trials are just beginning. 177 00:28:48,643 --> 00:28:49,523 It's midnight... 178 00:28:50,283 --> 00:28:52,683 on Mexico's Yucatan Peninsula. 179 00:28:55,483 --> 00:28:58,123 The full moon is at its brightest. 180 00:29:01,643 --> 00:29:04,843 There are creatures here we associate with the daytime. 181 00:29:07,883 --> 00:29:09,363 But at this time of year, 182 00:29:09,963 --> 00:29:11,723 they must take on the night. 183 00:29:19,843 --> 00:29:23,243 Night cameras reveal their secret world. 184 00:29:51,043 --> 00:29:54,643 Over 40,000 Caribbean flamingos. 185 00:30:00,203 --> 00:30:01,443 Despite the darkness, 186 00:30:02,763 --> 00:30:04,363 they can't afford to sleep. 187 00:30:07,443 --> 00:30:08,963 This is the breeding season. 188 00:30:11,563 --> 00:30:15,523 Caribbean flamingo chicks grow incredibly fast. 189 00:30:16,963 --> 00:30:21,483 To meet their insatiable appetites, both parents must stay active, 190 00:30:22,083 --> 00:30:23,923 day and night, 191 00:30:25,523 --> 00:30:27,523 in a constant relay of feeding. 192 00:30:31,043 --> 00:30:32,763 Chicks left unattended... 193 00:30:33,323 --> 00:30:35,043 form a crèche for safety. 194 00:30:39,203 --> 00:30:41,643 This chick is barely two weeks old... 195 00:30:42,483 --> 00:30:43,403 and hungry. 196 00:30:50,723 --> 00:30:52,923 Neither of his parents has returned, 197 00:30:53,563 --> 00:30:56,243 so he sets out to find them. 198 00:31:03,643 --> 00:31:04,643 In the dark, 199 00:31:05,243 --> 00:31:07,163 it's difficult to tell who's who. 200 00:31:15,923 --> 00:31:16,763 This... 201 00:31:17,243 --> 00:31:18,323 is not his mother. 202 00:31:24,163 --> 00:31:25,923 Begging strangers won't work, 203 00:31:26,483 --> 00:31:28,083 however hard he tries. 204 00:31:44,363 --> 00:31:48,323 His search has taken him away from the protection of the crèche... 205 00:31:49,803 --> 00:31:51,403 into dangerous waters. 206 00:32:09,843 --> 00:32:12,763 Crocodile eyes work well in darkness. 207 00:32:13,643 --> 00:32:16,763 They have a horizontal band of light-sensitive cells... 208 00:32:17,323 --> 00:32:18,683 for scanning the horizon. 209 00:32:32,363 --> 00:32:35,003 And with receptors all over their bodies, 210 00:32:35,763 --> 00:32:37,883 they can sense movement in the water. 211 00:32:46,643 --> 00:32:49,363 But the moon is bright tonight, 212 00:32:50,083 --> 00:32:52,363 so flamingos have a chance. 213 00:32:55,883 --> 00:32:57,363 They sound the early warning. 214 00:33:38,883 --> 00:33:44,243 These chicks grow so fast, they can already outrun the crocodile. 215 00:33:54,123 --> 00:33:56,083 By the time his mother returns, 216 00:33:57,883 --> 00:33:59,723 the crèche is back together. 217 00:34:12,363 --> 00:34:14,763 The chick can feed in safety. 218 00:34:21,643 --> 00:34:25,963 In just over seven weeks, all of these chicks will be able to fly. 219 00:34:27,483 --> 00:34:28,803 And their parents 220 00:34:28,883 --> 00:34:30,763 won't have to work through the night. 221 00:34:48,083 --> 00:34:49,803 It's now the early hours. 222 00:34:54,603 --> 00:34:56,363 Off the coast of Alaska, 223 00:34:56,443 --> 00:34:59,803 salmon are heading for their spawning grounds upriver. 224 00:35:21,963 --> 00:35:24,523 As the moon sinks below the mountains... 225 00:35:27,803 --> 00:35:30,843 deep valleys are plunged into darkness. 226 00:35:40,283 --> 00:35:44,483 A thermal-imaging camera allows us to cut through the night. 227 00:35:47,283 --> 00:35:50,043 It picks up the heat signature of the landscape... 228 00:35:50,683 --> 00:35:52,123 and the animals within. 229 00:36:11,923 --> 00:36:13,363 A coastal wolf. 230 00:36:14,243 --> 00:36:16,603 Smaller than Alaska's inland wolves... 231 00:36:17,843 --> 00:36:21,003 and only found in a few special places. 232 00:36:24,883 --> 00:36:26,163 At this time of year, 233 00:36:26,683 --> 00:36:28,243 she relies on salmon. 234 00:36:29,643 --> 00:36:31,843 They make up a quarter of her diet. 235 00:36:36,803 --> 00:36:38,963 Tonight, she's not alone. 236 00:36:50,243 --> 00:36:52,003 A giant grizzly bear... 237 00:36:55,763 --> 00:36:57,683 dangerous to a lone wolf. 238 00:37:10,203 --> 00:37:15,283 This bear has learned he can be twice as successful fishing in the darkness. 239 00:37:22,283 --> 00:37:24,123 Fish don't see well in the dark. 240 00:37:25,043 --> 00:37:26,323 Neither does the bear. 241 00:37:26,963 --> 00:37:30,123 But his other senses are incredibly sharp. 242 00:37:31,883 --> 00:37:35,043 He listens for salmon thrashing in the shallows... 243 00:37:37,523 --> 00:37:41,003 and sniffs out females heavy with nutritious eggs. 244 00:37:46,683 --> 00:37:48,403 He can't catch them by sight. 245 00:37:51,883 --> 00:37:54,163 But he can by touch. 246 00:38:01,443 --> 00:38:03,643 Sensitive paws become a trap... 247 00:38:04,483 --> 00:38:08,083 waiting to snatch any salmon that swims too close. 248 00:38:16,563 --> 00:38:18,523 A substantial catch. 249 00:38:20,203 --> 00:38:23,043 And just the first of many before dawn. 250 00:38:37,403 --> 00:38:38,923 With the bear occupied, 251 00:38:40,723 --> 00:38:42,923 the wolf sees her chance. 252 00:38:51,843 --> 00:38:54,283 Tonight, there's enough for everyone. 253 00:39:11,483 --> 00:39:13,603 These are the final hours of night, 254 00:39:13,683 --> 00:39:17,803 but the jungles of Asia are still deep in darkness. 255 00:39:24,003 --> 00:39:27,283 Moonlight struggles to penetrate this tangled forest. 256 00:39:43,003 --> 00:39:44,083 In Singapore, 257 00:39:44,683 --> 00:39:46,963 there's something strange in the canopy. 258 00:39:57,043 --> 00:39:59,123 A female colugo. 259 00:40:00,563 --> 00:40:01,643 Rarely seen, 260 00:40:02,243 --> 00:40:04,283 few people know they exist. 261 00:40:08,243 --> 00:40:09,643 Despite her appearance, 262 00:40:10,483 --> 00:40:13,083 she's actually a distant relative of ours. 263 00:40:16,683 --> 00:40:19,443 An early offshoot of our primate family. 264 00:40:24,883 --> 00:40:26,043 She has a baby. 265 00:40:35,923 --> 00:40:38,923 Membranes of skin allow her to keep it safe... 266 00:40:39,683 --> 00:40:41,243 high in the treetops. 267 00:40:48,283 --> 00:40:51,563 She's a member of a wide colugo social network. 268 00:40:56,363 --> 00:41:00,203 But it's hard to stay in touch above the clamor of the jungle night. 269 00:41:01,963 --> 00:41:05,723 The colugo's solution has only recently been discovered. 270 00:41:09,163 --> 00:41:13,603 They call at a frequency that cuts through the general noise. 271 00:41:20,163 --> 00:41:21,163 Ultrasound. 272 00:41:22,203 --> 00:41:23,843 Inaudible to the human ear. 273 00:41:26,163 --> 00:41:27,843 Secret signals... 274 00:41:28,683 --> 00:41:29,723 in the darkness. 275 00:41:34,283 --> 00:41:35,123 A warning. 276 00:41:35,843 --> 00:41:37,243 There is danger about. 277 00:41:49,763 --> 00:41:52,083 A reticulated python. 278 00:41:53,123 --> 00:41:54,243 He's cold-blooded. 279 00:41:55,483 --> 00:42:00,363 But hot jungle nights mean he can stay active after dark. 280 00:42:15,003 --> 00:42:16,883 Colugos have huge eyes... 281 00:42:18,123 --> 00:42:19,843 always scanning for danger. 282 00:42:23,363 --> 00:42:27,043 They've sacrificed color vision for light sensitivity. 283 00:42:32,603 --> 00:42:33,483 Crucial... 284 00:42:34,203 --> 00:42:35,283 in the forest night. 285 00:42:49,683 --> 00:42:51,803 -The alarm goes out. 286 00:43:02,643 --> 00:43:04,723 Unable to see at night... 287 00:43:07,683 --> 00:43:10,003 the python relies on other senses. 288 00:43:11,483 --> 00:43:13,923 Its tongue gathers scent. 289 00:43:15,763 --> 00:43:18,923 Receptors in its mouth taste the air. 290 00:43:22,883 --> 00:43:25,243 Colugos are good climbers. 291 00:43:31,603 --> 00:43:33,283 But so are pythons. 292 00:43:42,283 --> 00:43:43,763 The size of a house cat, 293 00:43:44,283 --> 00:43:46,043 she would make a decent meal. 294 00:43:51,963 --> 00:43:53,323 She's running out of tree. 295 00:43:59,643 --> 00:44:02,763 But she has one last trick. 296 00:44:19,643 --> 00:44:22,603 Colugos are master gliders. 297 00:44:28,043 --> 00:44:31,843 Capable of swooping over 130 meters. 298 00:44:48,723 --> 00:44:51,403 Silently soaring between the trees... 299 00:44:54,843 --> 00:44:57,643 to escape the perils of the night. 300 00:45:32,683 --> 00:45:34,443 The final act of night... 301 00:45:35,083 --> 00:45:36,043 is beginning. 302 00:45:43,643 --> 00:45:47,363 In Thailand, a haunting chorus heralds the dawn. 303 00:45:59,083 --> 00:46:01,923 These are the songs of lar gibbons. 304 00:46:10,163 --> 00:46:11,843 They rise before the sun... 305 00:46:13,043 --> 00:46:15,323 and begin a daily serenade. 306 00:46:23,963 --> 00:46:28,203 It's a duet between couples to strengthen their bonds. 307 00:46:54,483 --> 00:46:59,323 The still morning air takes their songs far across the canopy. 308 00:47:02,763 --> 00:47:03,803 Others join in. 309 00:47:05,563 --> 00:47:07,603 They welcome the return of day. 310 00:47:38,163 --> 00:47:40,723 As fast as the dark arrived, 311 00:47:42,923 --> 00:47:45,083 light now returns. 312 00:47:59,643 --> 00:48:02,243 Time for night creatures to find safety. 313 00:48:29,243 --> 00:48:31,923 The day shift can finally take over. 314 00:48:48,443 --> 00:48:50,643 Time to enjoy the warming sun... 315 00:48:54,083 --> 00:48:57,323 before night falls once again. 316 00:49:06,643 --> 00:49:10,243 Cutting-edge cameras are changing the way we understand 317 00:49:10,323 --> 00:49:13,243 some of the most iconic creatures on Earth... 318 00:49:17,363 --> 00:49:21,243 revealing that night is full of extraordinary challenges... 319 00:49:21,723 --> 00:49:23,923 and unrivaled opportunity. 320 00:49:29,723 --> 00:49:32,843 Who knows what other secrets will be uncovered... 321 00:49:33,403 --> 00:49:35,603 during a night on Earth?