1
00:00:07,403 --> 00:00:09,403
[distant chirping]

2
00:00:12,683 --> 00:00:16,083
[female narrator] We have always been
strangers to the night.

3
00:00:16,723 --> 00:00:18,803
[growling]

4
00:00:19,283 --> 00:00:22,043
It's a world our eyes cannot penetrate.

5
00:00:27,483 --> 00:00:29,883
A place of unnerving sounds...

6
00:00:30,563 --> 00:00:32,803
[bats screeching]

7
00:00:32,883 --> 00:00:34,803
...and imagined terrors.

8
00:00:38,043 --> 00:00:39,043
But now...

9
00:00:39,403 --> 00:00:40,763
for the first time...

10
00:00:42,043 --> 00:00:44,643
we can lift the veil of darkness.

11
00:00:56,883 --> 00:00:58,443
From secret jungles...

12
00:01:02,963 --> 00:01:04,843
to frozen kingdoms...

13
00:01:05,923 --> 00:01:08,283
[grunting]

14
00:01:09,083 --> 00:01:10,243
...new technology...

15
00:01:11,643 --> 00:01:14,723
allows us to reveal
rarely seen creatures...

16
00:01:19,283 --> 00:01:20,563
and hidden dramas.

17
00:01:20,643 --> 00:01:23,083
[growling]

18
00:01:24,363 --> 00:01:26,563
[groaning, whining]

19
00:01:26,643 --> 00:01:29,163
In every place on Earth...

20
00:01:32,883 --> 00:01:34,323
when the light fades...

21
00:01:36,043 --> 00:01:38,243
new worlds awake.

22
00:01:56,283 --> 00:01:58,563
As the day draws to a close,

23
00:01:59,643 --> 00:02:02,083
darkness races across the planet...

24
00:02:03,083 --> 00:02:05,643
at over 1,000 kilometers an hour.

25
00:02:07,163 --> 00:02:09,163
[uplifting music playing]

26
00:02:17,043 --> 00:02:19,043
[birds honking]

27
00:02:22,523 --> 00:02:25,403
From now until the break of dawn...

28
00:02:28,363 --> 00:02:31,163
every hour brings unique challenges.

29
00:02:36,643 --> 00:02:41,123
And every creature on Earth must find
a way to make it through the night.

30
00:02:59,803 --> 00:03:02,123
The Semien mountains in Ethiopia.

31
00:03:05,763 --> 00:03:07,723
Darkness is almost here.

32
00:03:15,283 --> 00:03:19,883
After a long, hot day,
this male gelada must gather his troop.

33
00:03:22,883 --> 00:03:25,563
These mountaintops won't be safe
for much longer.

34
00:03:27,363 --> 00:03:30,363
Hyenas and leopards
will soon be on the hunt.

35
00:03:36,683 --> 00:03:39,163
In the open, the geladas are vulnerable.

36
00:03:39,283 --> 00:03:41,563
[geladas chittering]

37
00:03:42,603 --> 00:03:45,923
Safety lies
100 meters over the cliff edge.

38
00:03:58,003 --> 00:04:02,243
Even the smallest must make the journey
if they are to survive the night.

39
00:04:07,083 --> 00:04:08,803
[rocks crumbling]

40
00:04:09,563 --> 00:04:11,243
A slip could be fatal.

41
00:04:14,563 --> 00:04:19,163
The old male's extra size means
he's far less agile than the rest.

42
00:04:31,243 --> 00:04:33,243
[shrieking]

43
00:04:37,883 --> 00:04:39,203
The darker it gets,

44
00:04:39,763 --> 00:04:41,483
the higher the risk of falling.

45
00:04:41,563 --> 00:04:42,643
[shrieks]

46
00:04:51,363 --> 00:04:52,443
They've made it.

47
00:05:01,163 --> 00:05:03,003
As they settle down for the night,

48
00:05:04,003 --> 00:05:06,043
geladas lick at the cliff wall...

49
00:05:08,723 --> 00:05:12,123
adding vital minerals
to their limited vegetarian diet.

50
00:05:14,283 --> 00:05:16,323
A behavior never recorded before.

51
00:05:19,443 --> 00:05:21,323
[licking]

52
00:05:24,283 --> 00:05:25,963
This precarious resting place

53
00:05:26,043 --> 00:05:30,003
should be enough to protect the geladas
from the danger of the darkness.

54
00:05:33,443 --> 00:05:34,443
For others...

55
00:05:35,363 --> 00:05:36,963
night brings protection.

56
00:05:38,043 --> 00:05:39,723
And it can't come soon enough.

57
00:05:47,763 --> 00:05:52,563
As the light slowly fades over Texas,
some are getting impatient.

58
00:05:58,883 --> 00:06:00,843
Hiding in this cave

59
00:06:00,923 --> 00:06:05,243
is the largest concentration of mammals
anywhere on Earth.

60
00:06:08,523 --> 00:06:10,363
[bats screeching]

61
00:06:21,243 --> 00:06:24,083
Twenty million free-tailed bats.

62
00:06:29,483 --> 00:06:32,243
All waiting for the cover of night.

63
00:06:37,563 --> 00:06:42,323
But the nearest places to feed
may be over 100 kilometers away.

64
00:06:46,163 --> 00:06:50,403
It's not possible to make the round trip
within the hours of darkness,

65
00:06:50,483 --> 00:06:52,323
so they have to brave the light.

66
00:06:53,283 --> 00:06:54,923
[raptor squawking]

67
00:06:57,643 --> 00:06:59,523
And the waiting raptors.

68
00:07:05,123 --> 00:07:07,403
[dramatic music playing]

69
00:07:26,643 --> 00:07:28,763
Superior vision and maneuverability

70
00:07:29,283 --> 00:07:32,403
give hawks and falcons the advantage
in the day.

71
00:07:38,883 --> 00:07:42,683
These bats are adapted
for fast, long-distance flights,

72
00:07:43,323 --> 00:07:45,003
not aerobatics.

73
00:07:45,323 --> 00:07:47,283
[dramatic music intensifies]

74
00:08:02,283 --> 00:08:04,723
Their only defense is numbers.

75
00:08:08,283 --> 00:08:10,283
[bats screeching]

76
00:08:28,123 --> 00:08:30,083
Overwhelming their predators,

77
00:08:30,643 --> 00:08:33,603
the vast majority will make it
to their feeding grounds.

78
00:08:38,763 --> 00:08:39,763
But not all.

79
00:08:52,723 --> 00:08:56,803
The exodus of millions of bats
continues for hours.

80
00:09:00,163 --> 00:09:02,163
[gentle piano music playing]

81
00:09:14,483 --> 00:09:18,003
Finally, the sun slips below the horizon,

82
00:09:19,723 --> 00:09:22,283
taking the last rays of light with it.

83
00:09:32,163 --> 00:09:33,003
Darkness.

84
00:09:36,363 --> 00:09:37,643
But not complete.

85
00:09:48,043 --> 00:09:53,363
The light of the full moon
is 400,000 times dimmer than the sun.

86
00:10:00,123 --> 00:10:02,123
[growling]

87
00:10:02,843 --> 00:10:05,003
Our eyes struggle to see.

88
00:10:10,723 --> 00:10:12,123
But a low-light camera...

89
00:10:14,763 --> 00:10:17,323
reveals a hidden nighttime world.

90
00:10:20,123 --> 00:10:22,603
Still very much awake.

91
00:10:23,963 --> 00:10:25,603
[distant howling]

92
00:10:31,843 --> 00:10:33,283
Zimbabwe.

93
00:10:33,803 --> 00:10:34,883
[grunts]

94
00:10:35,483 --> 00:10:38,323
It's the end of a long, hot dry season.

95
00:10:40,163 --> 00:10:42,843
Daytime temperatures
are topping 40 Celsius.

96
00:10:48,243 --> 00:10:50,043
Night brings relief.

97
00:10:51,563 --> 00:10:53,723
It's down to a manageable 22.

98
00:10:56,203 --> 00:10:59,163
[low growling]

99
00:11:01,283 --> 00:11:02,443
[growing]

100
00:11:05,163 --> 00:11:10,243
This elephant family must find
drinking water before the sun returns.

101
00:11:11,403 --> 00:11:13,003
[low rumbling]

102
00:11:15,883 --> 00:11:20,363
Traveling far by day,
for the newborn calf, is exhausting.

103
00:11:30,003 --> 00:11:34,123
They must cover as much distance
as possible while it's cool.

104
00:11:36,523 --> 00:11:39,083
But night is a mixed blessing.

105
00:11:42,643 --> 00:11:44,003
It brings out predators.

106
00:11:49,403 --> 00:11:52,603
Lions are primarily nocturnal hunters.

107
00:11:56,163 --> 00:11:58,363
Eyes sensitive to the faintest light...

108
00:12:00,763 --> 00:12:03,203
give them the edge over their prey.

109
00:12:08,963 --> 00:12:11,483
Elephants see better than we do
in the dark,

110
00:12:12,643 --> 00:12:14,563
but nowhere as well as a lion.

111
00:12:26,683 --> 00:12:30,883
Led by the oldest female,
the herd keep the little ones moving.

112
00:12:35,763 --> 00:12:37,803
[thundering]

113
00:12:38,643 --> 00:12:40,323
Storm clouds are brewing...

114
00:12:42,763 --> 00:12:44,043
obscuring the moon.

115
00:12:47,203 --> 00:12:48,843
[thundering]

116
00:12:53,763 --> 00:12:55,883
[rumbling]

117
00:12:57,163 --> 00:12:58,963
[rumbling intensifies]

118
00:12:59,763 --> 00:13:01,603
[thundering]

119
00:13:03,803 --> 00:13:07,643
Aside from flashes of lightning,
it's now pitch black.

120
00:13:12,163 --> 00:13:13,843
The elephants can barely see.

121
00:13:16,083 --> 00:13:17,603
[trumpeting]

122
00:13:18,483 --> 00:13:22,643
Now, their safety relies on hearing
and smell.

123
00:13:32,723 --> 00:13:34,923
They can sense lions are out there,

124
00:13:38,323 --> 00:13:40,643
but can't see where exactly.

125
00:13:57,523 --> 00:13:59,323
Elephants are dominant by day.

126
00:14:01,323 --> 00:14:02,363
But at night...

127
00:14:03,883 --> 00:14:05,123
the tables turn.

128
00:14:09,803 --> 00:14:11,883
[low growling]

129
00:14:13,203 --> 00:14:15,643
The newborn is especially vulnerable.

130
00:14:20,083 --> 00:14:21,883
She needs her family's protection.

131
00:14:22,763 --> 00:14:24,883
[rumbling]

132
00:14:31,123 --> 00:14:32,523
[loud rumbling]

133
00:14:48,523 --> 00:14:50,763
In the confusion, they scatter.

134
00:15:03,803 --> 00:15:05,363
[trumpeting]

135
00:15:08,723 --> 00:15:10,563
[rumbling]

136
00:15:17,403 --> 00:15:19,483
A female is cut off from the others.

137
00:15:25,363 --> 00:15:27,083
Left alone in the darkness.

138
00:15:29,923 --> 00:15:32,203
[low growling]

139
00:15:35,003 --> 00:15:37,323
[pained trumpeting in the distance]

140
00:15:50,083 --> 00:15:51,923
The eastern United States.

141
00:15:52,563 --> 00:15:54,563
Two hours after sunset...

142
00:16:01,563 --> 00:16:03,723
and magic is in the air.

143
00:16:13,083 --> 00:16:15,083
[whimsical music playing]

144
00:16:18,803 --> 00:16:20,083
Fireflies.

145
00:16:42,803 --> 00:16:45,203
Most fireflies flash their lights.

146
00:16:46,523 --> 00:16:51,243
But low-light cameras reveal a species
with a different approach.

147
00:17:03,083 --> 00:17:05,443
These are blue ghosts.

148
00:17:10,403 --> 00:17:12,883
Amorous males searching for a mate.

149
00:17:16,483 --> 00:17:18,243
Whilst others only twinkle,

150
00:17:18,843 --> 00:17:22,683
these can glow continuously
for up to a minute.

151
00:17:38,283 --> 00:17:41,843
Their light is a signal
to wingless females on the ground.

152
00:17:51,043 --> 00:17:53,403
She's the size of a grain of rice.

153
00:17:57,203 --> 00:17:59,843
But her glow is just enough...

154
00:18:00,683 --> 00:18:02,003
for males to find her.

155
00:18:12,163 --> 00:18:13,723
Time to breed is short.

156
00:18:15,043 --> 00:18:18,763
The mesmerizing display
only lasts for a few weeks.

157
00:18:34,163 --> 00:18:38,603
They turn off their lights, affording
a little privacy from the competition.

158
00:19:02,483 --> 00:19:03,563
Mating over,

159
00:19:04,083 --> 00:19:06,883
she now heads underground
to lay her eggs...

160
00:19:10,003 --> 00:19:13,683
ensuring the blue ghosts' show
will return next year.

161
00:19:23,403 --> 00:19:25,403
[wind gusting]

162
00:19:28,443 --> 00:19:29,963
In the fjords of Norway,

163
00:19:30,443 --> 00:19:33,203
the hours of twilight
have long since passed.

164
00:19:36,083 --> 00:19:37,563
[distant bell ringing]

165
00:19:40,963 --> 00:19:42,763
Herring are on the move.

166
00:19:43,563 --> 00:19:47,443
It should be safer now,
under the cover of darkness.

167
00:19:48,123 --> 00:19:49,883
[boat engine whirring]

168
00:19:54,603 --> 00:19:55,763
But not tonight.

169
00:19:59,563 --> 00:20:01,563
[water gurgling]

170
00:20:08,483 --> 00:20:12,563
Trawlers can scoop up hundreds of tons
in a single trip.

171
00:20:12,643 --> 00:20:14,643
[birds squawking]

172
00:20:35,083 --> 00:20:36,483
And all this activity...

173
00:20:37,763 --> 00:20:39,243
doesn't go unnoticed.

174
00:20:43,563 --> 00:20:45,003
These inky waters...

175
00:20:45,083 --> 00:20:46,283
[air blasting from blowhole]

176
00:20:46,363 --> 00:20:47,363
...are patrolled...

177
00:20:48,123 --> 00:20:49,203
by orcas.

178
00:20:49,283 --> 00:20:51,323
[whale singing]

179
00:20:54,483 --> 00:20:56,283
They've heard the sound of boats...

180
00:20:57,123 --> 00:20:59,123
[birds squawking]

181
00:21:00,803 --> 00:21:02,643
[air blasting from blowhole]

182
00:21:02,723 --> 00:21:05,683
and learned that it means opportunity.

183
00:21:19,483 --> 00:21:25,843
Normally, they would use echolocation,
natural sonar, to catch fish in the dark.

184
00:21:30,083 --> 00:21:32,923
But here, they've found an easier way.

185
00:21:34,883 --> 00:21:36,363
[air blasting from blowhole]

186
00:21:36,443 --> 00:21:38,283
They make use of the lights.

187
00:21:41,283 --> 00:21:43,323
Some fish escape the nets.

188
00:21:44,203 --> 00:21:47,243
But disoriented
and separated from the shoal,

189
00:21:48,163 --> 00:21:49,603
they're easy pickings.

190
00:22:14,643 --> 00:22:16,723
Seven-ton predators...

191
00:22:17,563 --> 00:22:19,043
show their delicate side.

192
00:22:28,963 --> 00:22:30,443
[air blasting from blowhole]

193
00:22:55,803 --> 00:23:00,843
Orcas are among the most intelligent
and social creatures in the ocean.

194
00:23:13,003 --> 00:23:16,883
And our night cameras reveal
what may be new behavior.

195
00:23:20,403 --> 00:23:21,483
Bubble signals.

196
00:23:22,443 --> 00:23:23,883
[water gurgling]

197
00:23:25,403 --> 00:23:26,443
In the lights,

198
00:23:26,963 --> 00:23:28,763
the bubbles act as a beacon...

199
00:23:31,723 --> 00:23:34,923
leading other members of the family
to a meal.

200
00:24:19,523 --> 00:24:22,003
[low growling]

201
00:24:25,683 --> 00:24:26,723
In Zimbabwe...

202
00:24:28,643 --> 00:24:31,763
the night has brought tragedy
to the elephant family.

203
00:24:38,643 --> 00:24:42,003
The isolated female
lost her battle with the lions.

204
00:24:49,963 --> 00:24:51,443
There's no time to mourn.

205
00:24:53,803 --> 00:24:56,443
The family must move on and find water.

206
00:25:05,523 --> 00:25:08,243
They've been walking for over four hours.

207
00:25:09,683 --> 00:25:11,443
The young ones are getting thirsty.

208
00:25:12,243 --> 00:25:14,803
The newborn is totally exhausted.

209
00:25:18,443 --> 00:25:21,443
But the matriarch knows
they're close to water.

210
00:25:26,563 --> 00:25:27,523
[chirps]

211
00:25:28,483 --> 00:25:29,683
She can smell it.

212
00:25:29,763 --> 00:25:32,043
[deep rumbling]

213
00:25:37,403 --> 00:25:39,003
[trumpeting]

214
00:25:43,203 --> 00:25:45,083
They're within touching distance...

215
00:25:47,083 --> 00:25:49,243
when danger threatens once more.

216
00:25:53,043 --> 00:25:54,603
[rumbling]

217
00:25:56,363 --> 00:25:57,443
Hyenas.

218
00:26:06,163 --> 00:26:10,203
By day, their eyesight is as good
as an elephant's.

219
00:26:13,523 --> 00:26:14,523
After dark,

220
00:26:15,323 --> 00:26:17,443
it's much, much better.

221
00:26:20,563 --> 00:26:22,683
The newborn must be protected.

222
00:26:23,883 --> 00:26:25,363
[trumpeting]

223
00:26:27,283 --> 00:26:29,483
[trumpeting]

224
00:26:29,563 --> 00:26:32,323
One wrong move
and the hyenas will grab her.

225
00:26:36,043 --> 00:26:38,203
[shrieking]

226
00:26:38,283 --> 00:26:41,243
Shrieks in the darkness
alert everyone to the danger.

227
00:26:59,563 --> 00:27:02,603
The hyenas do their best to create panic.

228
00:27:03,083 --> 00:27:04,923
[shrieking]

229
00:27:16,123 --> 00:27:17,243
[trumpeting]

230
00:27:20,403 --> 00:27:22,163
[trumpeting continues]

231
00:27:27,603 --> 00:27:29,683
But the elephants' distress calls...

232
00:27:31,243 --> 00:27:32,243
have been heard.

233
00:27:44,763 --> 00:27:47,363
Extended family to the rescue.

234
00:28:07,003 --> 00:28:09,803
The herd can finally quench their thirst.

235
00:28:21,083 --> 00:28:22,923
With strong family bonds,

236
00:28:23,003 --> 00:28:28,123
these young elephants have overcome
the challenges of the darkest hours.

237
00:28:39,883 --> 00:28:40,883
But for others,

238
00:28:42,043 --> 00:28:43,763
the trials are just beginning.

239
00:28:48,643 --> 00:28:49,523
It's midnight...

240
00:28:50,283 --> 00:28:52,683
on Mexico's Yucatan Peninsula.

241
00:28:55,483 --> 00:28:58,123
The full moon is at its brightest.

242
00:29:01,643 --> 00:29:04,843
There are creatures here
we associate with the daytime.

243
00:29:07,883 --> 00:29:09,363
But at this time of year,

244
00:29:09,963 --> 00:29:11,723
they must take on the night.

245
00:29:16,403 --> 00:29:18,683
[squawking]

246
00:29:19,843 --> 00:29:23,243
Night cameras reveal their secret world.

247
00:29:38,283 --> 00:29:40,283
[squawking]

248
00:29:51,043 --> 00:29:54,643
Over 40,000 Caribbean flamingos.

249
00:30:00,203 --> 00:30:01,443
Despite the darkness,

250
00:30:02,763 --> 00:30:04,363
they can't afford to sleep.

251
00:30:07,443 --> 00:30:08,963
This is the breeding season.

252
00:30:11,563 --> 00:30:15,523
Caribbean flamingo chicks
grow incredibly fast.

253
00:30:16,963 --> 00:30:21,483
To meet their insatiable appetites,
both parents must stay active,

254
00:30:22,083 --> 00:30:23,923
day and night,

255
00:30:25,523 --> 00:30:27,523
in a constant relay of feeding.

256
00:30:31,043 --> 00:30:32,763
Chicks left unattended...

257
00:30:33,323 --> 00:30:35,043
form a crèche for safety.

258
00:30:39,203 --> 00:30:41,643
This chick is barely two weeks old...

259
00:30:42,483 --> 00:30:43,403
and hungry.

260
00:30:50,723 --> 00:30:52,923
Neither of his parents has returned,

261
00:30:53,563 --> 00:30:56,243
so he sets out to find them.

262
00:31:03,643 --> 00:31:04,643
In the dark,

263
00:31:05,243 --> 00:31:07,163
it's difficult to tell who's who.

264
00:31:15,923 --> 00:31:16,763
This...

265
00:31:17,243 --> 00:31:18,323
is not his mother.

266
00:31:19,003 --> 00:31:21,163
[squawking]

267
00:31:24,163 --> 00:31:25,923
Begging strangers won't work,

268
00:31:26,483 --> 00:31:28,083
however hard he tries.

269
00:31:44,363 --> 00:31:48,323
His search has taken him away
from the protection of the crèche...

270
00:31:49,803 --> 00:31:51,403
into dangerous waters.

271
00:32:09,843 --> 00:32:12,763
Crocodile eyes work well in darkness.

272
00:32:13,643 --> 00:32:16,763
They have a horizontal band
of light-sensitive cells...

273
00:32:17,323 --> 00:32:18,683
for scanning the horizon.

274
00:32:32,363 --> 00:32:35,003
And with receptors
all over their bodies,

275
00:32:35,763 --> 00:32:37,883
they can sense movement in the water.

276
00:32:46,643 --> 00:32:49,363
But the moon is bright tonight,

277
00:32:50,083 --> 00:32:52,363
so flamingos have a chance.

278
00:32:55,883 --> 00:32:57,363
They sound the early warning.

279
00:32:57,443 --> 00:32:59,443
[squawking]

280
00:33:00,523 --> 00:33:02,523
[suspenseful music playing]

281
00:33:26,723 --> 00:33:28,563
[flamingos squawking overhead]

282
00:33:38,883 --> 00:33:44,243
These chicks grow so fast,
they can already outrun the crocodile.

283
00:33:54,123 --> 00:33:56,083
By the time his mother returns,

284
00:33:57,883 --> 00:33:59,723
the crèche is back together.

285
00:34:12,363 --> 00:34:14,763
The chick can feed in safety.

286
00:34:21,643 --> 00:34:25,963
In just over seven weeks,
all of these chicks will be able to fly.

287
00:34:27,483 --> 00:34:28,803
And their parents

288
00:34:28,883 --> 00:34:30,763
won't have to work through the night.

289
00:34:48,083 --> 00:34:49,803
It's now the early hours.

290
00:34:54,603 --> 00:34:56,363
Off the coast of Alaska,

291
00:34:56,443 --> 00:34:59,803
salmon are heading
for their spawning grounds upriver.

292
00:35:21,963 --> 00:35:24,523
As the moon sinks below the mountains...

293
00:35:27,803 --> 00:35:30,843
deep valleys are plunged into darkness.

294
00:35:30,923 --> 00:35:32,603
[distant howling]

295
00:35:40,283 --> 00:35:44,483
A thermal-imaging camera
allows us to cut through the night.

296
00:35:47,283 --> 00:35:50,043
It picks up the heat signature
of the landscape...

297
00:35:50,683 --> 00:35:52,123
and the animals within.

298
00:36:11,923 --> 00:36:13,363
A coastal wolf.

299
00:36:14,243 --> 00:36:16,603
Smaller than Alaska's inland wolves...

300
00:36:17,843 --> 00:36:21,003
and only found in a few special places.

301
00:36:21,083 --> 00:36:22,923
[water splashing]

302
00:36:24,883 --> 00:36:26,163
At this time of year,

303
00:36:26,683 --> 00:36:28,243
she relies on salmon.

304
00:36:29,643 --> 00:36:31,843
They make up a quarter of her diet.

305
00:36:36,803 --> 00:36:38,963
Tonight, she's not alone.

306
00:36:40,563 --> 00:36:41,963
[growls]

307
00:36:50,243 --> 00:36:52,003
A giant grizzly bear...

308
00:36:55,763 --> 00:36:57,683
dangerous to a lone wolf.

309
00:36:59,003 --> 00:37:01,923
[sniffing]

310
00:37:10,203 --> 00:37:15,283
This bear has learned he can be twice
as successful fishing in the darkness.

311
00:37:22,283 --> 00:37:24,123
Fish don't see well in the dark.

312
00:37:25,043 --> 00:37:26,323
Neither does the bear.

313
00:37:26,963 --> 00:37:30,123
But his other senses are incredibly sharp.

314
00:37:31,883 --> 00:37:35,043
He listens for salmon
thrashing in the shallows...

315
00:37:37,523 --> 00:37:41,003
and sniffs out females
heavy with nutritious eggs.

316
00:37:46,683 --> 00:37:48,403
He can't catch them by sight.

317
00:37:51,883 --> 00:37:54,163
But he can by touch.

318
00:37:57,203 --> 00:37:58,283
[grunts]

319
00:38:01,443 --> 00:38:03,643
Sensitive paws become a trap...

320
00:38:04,483 --> 00:38:08,083
waiting to snatch any salmon
that swims too close.

321
00:38:16,563 --> 00:38:18,523
A substantial catch.

322
00:38:20,203 --> 00:38:23,043
And just the first of many before dawn.

323
00:38:24,363 --> 00:38:26,163
[sniffing]

324
00:38:37,403 --> 00:38:38,923
With the bear occupied,

325
00:38:40,723 --> 00:38:42,923
the wolf sees her chance.

326
00:38:45,323 --> 00:38:46,883
[water splashing]

327
00:38:51,843 --> 00:38:54,283
Tonight, there's enough for everyone.

328
00:39:11,483 --> 00:39:13,603
These are the final hours of night,

329
00:39:13,683 --> 00:39:17,803
but the jungles of Asia
are still deep in darkness.

330
00:39:24,003 --> 00:39:27,283
Moonlight struggles to penetrate
this tangled forest.

331
00:39:27,763 --> 00:39:29,523
[hooting]

332
00:39:43,003 --> 00:39:44,083
In Singapore,

333
00:39:44,683 --> 00:39:46,963
there's something strange in the canopy.

334
00:39:57,043 --> 00:39:59,123
A female colugo.

335
00:40:00,563 --> 00:40:01,643
Rarely seen,

336
00:40:02,243 --> 00:40:04,283
few people know they exist.

337
00:40:08,243 --> 00:40:09,643
Despite her appearance,

338
00:40:10,483 --> 00:40:13,083
she's actually a distant relative of ours.

339
00:40:16,683 --> 00:40:19,443
An early offshoot of our primate family.

340
00:40:24,883 --> 00:40:26,043
She has a baby.

341
00:40:35,923 --> 00:40:38,923
Membranes of skin
allow her to keep it safe...

342
00:40:39,683 --> 00:40:41,243
high in the treetops.

343
00:40:48,283 --> 00:40:51,563
She's a member
of a wide colugo social network.

344
00:40:56,363 --> 00:41:00,203
But it's hard to stay in touch
above the clamor of the jungle night.

345
00:41:01,963 --> 00:41:05,723
The colugo's solution
has only recently been discovered.

346
00:41:09,163 --> 00:41:13,603
They call at a frequency
that cuts through the general noise.

347
00:41:16,923 --> 00:41:20,083
[high-pitch chirping]

348
00:41:20,163 --> 00:41:21,163
Ultrasound.

349
00:41:22,203 --> 00:41:23,843
Inaudible to the human ear.

350
00:41:26,163 --> 00:41:27,843
Secret signals...

351
00:41:28,683 --> 00:41:29,723
in the darkness.

352
00:41:34,283 --> 00:41:35,123
A warning.

353
00:41:35,843 --> 00:41:37,243
There is danger about.

354
00:41:49,763 --> 00:41:52,083
A reticulated python.

355
00:41:53,123 --> 00:41:54,243
He's cold-blooded.

356
00:41:55,483 --> 00:42:00,363
But hot jungle nights
mean he can stay active after dark.

357
00:42:15,003 --> 00:42:16,883
Colugos have huge eyes...

358
00:42:18,123 --> 00:42:19,843
always scanning for danger.

359
00:42:23,363 --> 00:42:27,043
They've sacrificed color vision
for light sensitivity.

360
00:42:32,603 --> 00:42:33,483
Crucial...

361
00:42:34,203 --> 00:42:35,283
in the forest night.

362
00:42:49,683 --> 00:42:51,803
-[high-pitched chirp]
-The alarm goes out.

363
00:42:52,603 --> 00:42:53,803
[chirping continues]

364
00:42:55,603 --> 00:42:57,603
[hissing]

365
00:43:02,643 --> 00:43:04,723
Unable to see at night...

366
00:43:07,683 --> 00:43:10,003
the python relies on other senses.

367
00:43:11,483 --> 00:43:13,923
Its tongue gathers scent.

368
00:43:15,763 --> 00:43:18,923
Receptors in its mouth taste the air.

369
00:43:22,883 --> 00:43:25,243
Colugos are good climbers.

370
00:43:31,603 --> 00:43:33,283
But so are pythons.

371
00:43:42,283 --> 00:43:43,763
The size of a house cat,

372
00:43:44,283 --> 00:43:46,043
she would make a decent meal.

373
00:43:51,963 --> 00:43:53,323
She's running out of tree.

374
00:43:59,643 --> 00:44:02,763
But she has one last trick.

375
00:44:19,643 --> 00:44:22,603
Colugos are master gliders.

376
00:44:28,043 --> 00:44:31,843
Capable of swooping over 130 meters.

377
00:44:48,723 --> 00:44:51,403
Silently soaring between the trees...

378
00:44:54,843 --> 00:44:57,643
to escape the perils of the night.

379
00:45:32,683 --> 00:45:34,443
The final act of night...

380
00:45:35,083 --> 00:45:36,043
is beginning.

381
00:45:41,923 --> 00:45:43,163
[distant hooing]

382
00:45:43,643 --> 00:45:47,363
In Thailand,
a haunting chorus heralds the dawn.

383
00:45:54,323 --> 00:45:56,523
[hooing continues]

384
00:45:59,083 --> 00:46:01,923
These are the songs of lar gibbons.

385
00:46:10,163 --> 00:46:11,843
They rise before the sun...

386
00:46:13,043 --> 00:46:15,323
and begin a daily serenade.

387
00:46:15,763 --> 00:46:18,363
[hooing intensifies]

388
00:46:23,963 --> 00:46:28,203
It's a duet between couples
to strengthen their bonds.

389
00:46:28,283 --> 00:46:31,203
[hooing]

390
00:46:54,483 --> 00:46:59,323
The still morning air takes their songs
far across the canopy.

391
00:47:02,763 --> 00:47:03,803
Others join in.

392
00:47:05,563 --> 00:47:07,603
They welcome the return of day.

393
00:47:18,323 --> 00:47:20,403
[hooing intensifies]

394
00:47:38,163 --> 00:47:40,723
As fast as the dark arrived,

395
00:47:42,923 --> 00:47:45,083
light now returns.

396
00:47:59,643 --> 00:48:02,243
Time for night creatures to find safety.

397
00:48:29,243 --> 00:48:31,923
The day shift can finally take over.

398
00:48:48,443 --> 00:48:50,643
Time to enjoy the warming sun...

399
00:48:54,083 --> 00:48:57,323
before night falls once again.

400
00:49:06,643 --> 00:49:10,243
Cutting-edge cameras
are changing the way we understand

401
00:49:10,323 --> 00:49:13,243
some of the most iconic
creatures on Earth...

402
00:49:17,363 --> 00:49:21,243
revealing that night is full
of extraordinary challenges...

403
00:49:21,723 --> 00:49:23,923
and unrivaled opportunity.

404
00:49:24,003 --> 00:49:25,643
[water gurgling]

405
00:49:25,723 --> 00:49:27,723
[water splashing]

406
00:49:29,723 --> 00:49:32,843
Who knows
what other secrets will be uncovered...

407
00:49:33,403 --> 00:49:35,603
during a night on Earth?

408
00:49:39,363 --> 00:49:41,363
[instrumental music playing]