1
00:00:23,898 --> 00:00:26,776
When scientists first arrived at Ngogo…

2
00:00:31,906 --> 00:00:34,701
…they discovered
an advanced chimpanzee society.

3
00:00:47,422 --> 00:00:49,883
Over the decades, that society

4
00:00:50,717 --> 00:00:53,678
grew to become the biggest chimp group

5
00:00:54,220 --> 00:00:55,430
ever known.

6
00:00:56,639 --> 00:00:58,141
They expanded their territory,

7
00:00:59,809 --> 00:01:01,311
dominated the forest,

8
00:01:02,604 --> 00:01:05,148
and built an empire.

9
00:01:14,032 --> 00:01:16,034
But rivalries developed,

10
00:01:17,494 --> 00:01:19,913
and the empire divided.

11
00:01:23,917 --> 00:01:27,921
A small but powerful band of males
broke away to form their own group.

12
00:01:29,881 --> 00:01:30,924
They became…

13
00:01:32,842 --> 00:01:33,968
the westerners.

14
00:01:35,804 --> 00:01:38,223
Chimps that lived together for years…

15
00:01:39,724 --> 00:01:41,226
…became enemies.

16
00:01:49,734 --> 00:01:50,985
And now…

17
00:01:52,987 --> 00:01:53,988
their rivalry

18
00:01:54,823 --> 00:01:56,116
has turned deadly.

19
00:02:26,563 --> 00:02:28,356
It's still just a few days

20
00:02:28,940 --> 00:02:30,775
since the central chimps

21
00:02:31,818 --> 00:02:33,194
found Pork Pie dead.

22
00:02:40,076 --> 00:02:42,787
It's not known
what chimps understand about death…

23
00:02:45,290 --> 00:02:46,457
or whether they grieve.

24
00:02:51,129 --> 00:02:54,716
But the loss of Pork Pie
has clearly had an impact.

25
00:03:01,055 --> 00:03:02,599
For the central chimps,

26
00:03:02,682 --> 00:03:05,560
the world has become more dangerous.

27
00:03:42,805 --> 00:03:45,433
Christine's baby is now nine months old.

28
00:03:50,897 --> 00:03:52,106
When she first arrived,

29
00:03:53,024 --> 00:03:55,860
her sister, Nadine, was neglected.

30
00:03:59,572 --> 00:04:00,907
Now she's a little older,

31
00:04:02,575 --> 00:04:04,744
and her personality
is beginning to develop…

32
00:04:06,913 --> 00:04:09,249
she's begun to add to Nadine's life.

33
00:04:13,670 --> 00:04:14,921
They're not only sisters.

34
00:04:16,714 --> 00:04:18,132
They're best friends.

35
00:04:43,825 --> 00:04:46,160
Ngogo is never richer in food

36
00:04:46,244 --> 00:04:49,163
than when Chrysophyllum is in fruit.

37
00:04:50,415 --> 00:04:52,333
And it brings the chimps together.

38
00:05:19,444 --> 00:05:21,529
Jackson is still under pressure.

39
00:05:25,074 --> 00:05:27,160
Abrams is back in his place,

40
00:05:27,243 --> 00:05:29,078
but he won't give up.

41
00:05:32,623 --> 00:05:35,543
Jackson needs to remind everyone
who is in charge.

42
00:06:31,391 --> 00:06:34,143
While Jackson is focused
on dominating at home,

43
00:06:34,936 --> 00:06:38,314
other chimps are standing guard
at the western border…

44
00:06:42,276 --> 00:06:44,153
alert to the new threat they face.

45
00:06:59,627 --> 00:07:00,795
Abrams is here.

46
00:07:03,256 --> 00:07:05,466
And so are several other adult males.

47
00:07:27,447 --> 00:07:29,574
But they have no way of knowing

48
00:07:29,657 --> 00:07:32,326
when the westerners will strike again.

49
00:08:00,271 --> 00:08:02,440
{\an8}The life of an alpha male isn't easy.

50
00:08:04,567 --> 00:08:06,027
But it comes with benefits.

51
00:08:08,654 --> 00:08:11,240
Generally, the higher a chimp's rank,

52
00:08:12,074 --> 00:08:14,494
the more opportunities they have to mate.

53
00:08:18,789 --> 00:08:20,833
Mature females like Bartoli

54
00:08:22,210 --> 00:08:25,087
normally give birth
every five or six years.

55
00:09:08,673 --> 00:09:11,759
{\an8}Bartoli's son, Herzog,
is six years old now,

56
00:09:14,220 --> 00:09:16,138
and she's ready to get pregnant again.

57
00:09:28,526 --> 00:09:30,903
She could do a lot worse
than Jackson's genes.

58
00:09:32,822 --> 00:09:34,323
But she needs to be cautious.

59
00:09:38,035 --> 00:09:38,995
Jackson is big,

60
00:09:39,829 --> 00:09:41,998
powerful, and unpredictable.

61
00:09:45,209 --> 00:09:48,296
She needs to keep herself and Herzog safe…

62
00:09:51,299 --> 00:09:53,968
and ensure that Jackson is calm.

63
00:10:05,688 --> 00:10:08,107
Herzog finds the whole thing confusing.

64
00:10:14,614 --> 00:10:15,865
But as a young chimp,

65
00:10:15,948 --> 00:10:17,867
he has to stay close to his mother.

66
00:10:25,291 --> 00:10:26,542
Whatever she's doing.

67
00:10:56,572 --> 00:10:58,658
Jackson is making his move.

68
00:11:00,743 --> 00:11:02,036
By waving a branch,

69
00:11:02,912 --> 00:11:05,665
he's asking Bartoli to follow him…

70
00:11:08,250 --> 00:11:09,168
and mate.

71
00:11:32,066 --> 00:11:33,901
And Bartoli seems keen.

72
00:11:59,093 --> 00:12:02,054
-Herzog makes an attempt to break it up.

73
00:12:10,646 --> 00:12:11,731
But it's too late.

74
00:12:19,572 --> 00:12:21,115
Jackson got what he wanted.

75
00:12:26,746 --> 00:12:27,997
And so did Bartoli.

76
00:12:32,960 --> 00:12:34,587
But it's been a tiring day.

77
00:12:40,468 --> 00:12:43,721
Female chimps mate with multiple males.

78
00:12:43,804 --> 00:12:45,222
So there's no guarantee

79
00:12:45,306 --> 00:12:47,933
Jackson will be
the father of Bartoli's baby.

80
00:12:52,271 --> 00:12:54,106
He stands a good chance though.

81
00:12:55,566 --> 00:12:57,109
Because it's happened before.

82
00:12:58,360 --> 00:13:00,154
Although Jackson doesn't know it,

83
00:13:01,697 --> 00:13:03,741
Herzog is his son.

84
00:13:34,438 --> 00:13:37,316
Chimps don't always hunt
because they are hungry.

85
00:13:40,694 --> 00:13:43,572
In fact, usually the opposite is true.

86
00:13:46,617 --> 00:13:47,785
They hunt much more

87
00:13:47,868 --> 00:13:50,746
when they are well-fed
and bursting with energy.

88
00:13:54,250 --> 00:13:56,377
When Chrysophyllum is in full fruit,

89
00:13:57,169 --> 00:13:59,797
hunting goes into overdrive.

90
00:14:28,075 --> 00:14:30,661
Chimpanzees don't conserve resources…

91
00:14:35,624 --> 00:14:38,252
or think about the nature
of what they are eating.

92
00:14:48,262 --> 00:14:49,763
With this many kills,

93
00:14:50,431 --> 00:14:53,267
meat sharing is highly political.

94
00:15:03,193 --> 00:15:05,696
For Jackson, this big duiker

95
00:15:05,779 --> 00:15:08,365
is an opportunity
to strengthen his position

96
00:15:09,033 --> 00:15:10,868
by sharing with his allies.

97
00:15:34,099 --> 00:15:37,728
Today, he's favoring
another high-ranking male.

98
00:15:41,982 --> 00:15:42,983
Peterson.

99
00:15:52,368 --> 00:15:53,869
But just as important

100
00:15:53,953 --> 00:15:55,829
is who he's excluding.

101
00:16:29,238 --> 00:16:32,116
Wilson is an up-and-coming young male.

102
00:16:36,870 --> 00:16:37,913
He's strong,

103
00:16:38,580 --> 00:16:39,748
and he's ambitious.

104
00:16:42,209 --> 00:16:43,919
Jackson is not including him.

105
00:16:54,847 --> 00:16:56,432
And he's taking it badly.

106
00:17:16,744 --> 00:17:19,246
The males can be aggressive around meat,

107
00:17:19,747 --> 00:17:22,708
and the females need to tread carefully.

108
00:17:25,044 --> 00:17:26,795
{\an8}

109
00:17:36,346 --> 00:17:37,848
Christine wants a share.

110
00:17:43,562 --> 00:17:45,773
And she's willing to take the risk.

111
00:18:05,417 --> 00:18:08,045
Wilson is watching carefully.

112
00:18:31,860 --> 00:18:33,779
Christine got what she came for.

113
00:18:40,327 --> 00:18:41,912
But she may not get to keep it.

114
00:18:58,512 --> 00:19:00,514
Wilson is taking out his frustrations.

115
00:19:26,832 --> 00:19:29,126
Fortunately, the baby wasn't hurt.

116
00:19:33,672 --> 00:19:37,467
But Christine needs to take
her family away to safety.

117
00:20:14,379 --> 00:20:16,465
This is a quiet part of the forest,

118
00:20:17,341 --> 00:20:19,051
away from most of the group.

119
00:20:25,849 --> 00:20:27,768
But Christine is not alone.

120
00:20:45,994 --> 00:20:47,871
{\an8}

121
00:21:19,194 --> 00:21:22,281
Gus can't offer protection
from a chimp like Wilson.

122
00:21:23,407 --> 00:21:25,826
But at least he can offer some comfort…

123
00:21:30,914 --> 00:21:33,041
to Christine and her family.

124
00:22:13,832 --> 00:22:16,668
Abrams' challenge to Jackson has stalled.

125
00:22:16,752 --> 00:22:19,504
{\an8}

126
00:22:20,589 --> 00:22:24,051
{\an8}Jackson is propped up
by some powerful allies.

127
00:22:44,613 --> 00:22:46,990
And Abrams is lacking support.

128
00:22:53,121 --> 00:22:55,874
{\an8}But now there's another
ambitious young chimp

129
00:22:56,875 --> 00:22:58,668
{\an8}with a grudge against Jackson.

130
00:23:24,778 --> 00:23:27,906
This could be the beginning
of a powerful alliance.

131
00:23:48,260 --> 00:23:51,304
For now, Abrams and Wilson

132
00:23:51,930 --> 00:23:55,350
are joining a group of males
to patrol westwards.

133
00:24:13,452 --> 00:24:14,995
Jackson is not with them.

134
00:24:22,669 --> 00:24:25,172
As powerful as he is in his own territory,

135
00:24:26,631 --> 00:24:28,967
Jackson fears the west.

136
00:24:36,391 --> 00:24:37,726
He grew up in the west

137
00:24:38,602 --> 00:24:41,188
and was allies with the westerners
for many years.

138
00:24:45,192 --> 00:24:46,610
But when the group split,

139
00:24:47,486 --> 00:24:48,778
he deserted them

140
00:24:48,862 --> 00:24:52,365
to reign as alpha
of the bigger central group.

141
00:24:57,829 --> 00:24:59,247
As conflict erupted,

142
00:25:00,040 --> 00:25:02,959
the western males targeted Jackson.

143
00:25:09,674 --> 00:25:10,926
He escaped with his life.

144
00:25:12,928 --> 00:25:14,888
But he still bears the scars.

145
00:25:21,645 --> 00:25:25,398
The westerners are a threat
to all the central males.

146
00:25:26,274 --> 00:25:29,277
But they hold
a bitter grudge against Jackson.

147
00:25:31,655 --> 00:25:33,949
And he fears them to this day.

148
00:25:47,087 --> 00:25:49,839
The borderlands
are filled with Chrysophyllum.

149
00:26:00,892 --> 00:26:04,187
The westerners are spending
more and more time here feeding.

150
00:26:10,527 --> 00:26:12,404
After killing Pork Pie,

151
00:26:12,487 --> 00:26:14,197
they've grown in confidence.

152
00:26:28,044 --> 00:26:31,298
And there are chimps in the group
that won't stop there.

153
00:26:50,358 --> 00:26:53,987
Rollins and Damien
will always want more territory.

154
00:27:10,879 --> 00:27:13,173
The western males are getting stronger.

155
00:27:26,102 --> 00:27:28,063
They are constantly displaying.

156
00:27:45,246 --> 00:27:47,582
The westerners are getting ready
to make their move.

157
00:28:11,147 --> 00:28:13,942
And Richmond is at the center of it.

158
00:28:39,092 --> 00:28:40,635
He's not alpha anymore,

159
00:28:41,177 --> 00:28:43,304
but he's still a chimp to be feared.

160
00:29:00,572 --> 00:29:02,282
Bergl is back to full health.

161
00:29:11,207 --> 00:29:13,168
And that's not his only progress.

162
00:29:46,242 --> 00:29:48,286
He's regularly grooming with Garrison,

163
00:29:49,746 --> 00:29:51,581
who seems to be a good influence.

164
00:30:05,220 --> 00:30:08,306
And he's even started to bond
with the west's patrol leaders.

165
00:30:09,015 --> 00:30:10,642
{\an8}

166
00:30:28,827 --> 00:30:30,870
Wrestling is a good test of strength.

167
00:30:43,925 --> 00:30:47,554
And it gives Rollins and Damien
a chance to see what Bergl is made of.

168
00:31:16,332 --> 00:31:18,877
The westerners need
every chimp they've got.

169
00:31:24,716 --> 00:31:27,051
If they're going to claim
this area for themselves,

170
00:31:27,135 --> 00:31:30,221
they'll have to confront
the central chimps in their own territory…

171
00:31:31,890 --> 00:31:33,182
…and push them back.

172
00:31:37,520 --> 00:31:39,856
For this, they need numbers.

173
00:31:43,526 --> 00:31:45,278
So they'll travel in force,

174
00:31:46,237 --> 00:31:48,781
males and females together.

175
00:32:51,177 --> 00:32:54,263
{\an8}Bartoli and Herzog
are near the borderlands,

176
00:32:55,139 --> 00:32:59,185
{\an8}getting some peace away from Jackson
and the other central males.

177
00:33:02,063 --> 00:33:03,106
It's much needed.

178
00:33:08,611 --> 00:33:10,738
But she has no idea what's coming.

179
00:33:33,720 --> 00:33:34,804
If they're caught,

180
00:33:35,304 --> 00:33:36,848
Herzog could be killed.

181
00:34:42,872 --> 00:34:45,708
A western male
is chasing Bartoli into the canopy.

182
00:34:55,134 --> 00:34:56,886
She and Herzog have been separated.

183
00:35:14,028 --> 00:35:16,739
But Herzog won't leave his mother.

184
00:35:21,786 --> 00:35:23,246
He's going to try to protect her.

185
00:35:31,671 --> 00:35:33,381
He's got the attacker's attention.

186
00:35:40,429 --> 00:35:43,474
But now they're both trapped
in the canopy…

187
00:35:47,979 --> 00:35:48,896
at the mercy

188
00:35:49,480 --> 00:35:50,940
of the western males.

189
00:36:26,058 --> 00:36:27,977
But the westerners aren't attacking.

190
00:36:39,989 --> 00:36:41,157
They're moving on.

191
00:37:13,814 --> 00:37:17,109
A lone family is not
what the westerners are looking for.

192
00:37:47,848 --> 00:37:49,809
Bartoli and Herzog

193
00:37:50,434 --> 00:37:51,852
slip away together.

194
00:38:06,325 --> 00:38:09,453
The westerners are pushing deeper
into the central territory.

195
00:38:20,131 --> 00:38:21,215
And some chimps

196
00:38:22,133 --> 00:38:23,509
are beginning to hesitate.

197
00:38:30,808 --> 00:38:33,269
For Carson, the risk is too great.

198
00:38:37,815 --> 00:38:40,401
And she's going to put
E.O.'s safety first.

199
00:38:48,868 --> 00:38:51,871
Many females and younger chimps

200
00:38:52,663 --> 00:38:54,874
will drop out
with the threat of real battle.

201
00:38:57,460 --> 00:38:58,377
And Joya

202
00:38:59,337 --> 00:39:01,339
is choosing to follow Carson home.

203
00:39:12,350 --> 00:39:15,686
A chimp like Bergl should fall back too.

204
00:39:17,104 --> 00:39:19,398
He's too young and too small.

205
00:39:29,825 --> 00:39:31,077
But Bergl is staying.

206
00:39:38,042 --> 00:39:39,585
He's grown in confidence.

207
00:39:42,254 --> 00:39:45,549
And for him, conflict is in the blood.

208
00:39:57,228 --> 00:39:58,979
Although neither of them know it…

209
00:40:05,694 --> 00:40:07,113
he is Rollins's son.

210
00:40:17,832 --> 00:40:21,669
The western males
are deep inside the central territory.

211
00:40:31,011 --> 00:40:33,639
And they can sense
their enemies are close.

212
00:41:11,469 --> 00:41:14,597
The central chimps
have been caught off guard before.

213
00:41:27,401 --> 00:41:28,527
But not this time.

214
00:41:31,780 --> 00:41:33,824
{\an8}This time, they're ready.

215
00:42:19,578 --> 00:42:23,332
When two big groups come face-to-face,

216
00:42:24,083 --> 00:42:27,294
the outcome is always unpredictable.

217
00:42:57,992 --> 00:42:59,368
The westerners attack.

218
00:43:06,959 --> 00:43:09,878
And the centrallers meet them head-on.

219
00:43:28,397 --> 00:43:30,149
Bergl is right in the middle of it.

220
00:43:42,286 --> 00:43:44,663
The westerners are pushing
the centrallers back.

221
00:44:23,243 --> 00:44:26,789
But some chimps
still haven't joined the battle.

222
00:44:28,499 --> 00:44:29,917
{\an8}

223
00:44:52,189 --> 00:44:54,566
If the centrallers
are going to fight back,

224
00:44:54,650 --> 00:44:57,736
it will be now, behind their alpha.

225
00:45:16,630 --> 00:45:19,174
Jackson is face-to-face
with his old rivals.

226
00:45:20,092 --> 00:45:22,845
The same chimps
that tried to kill him years ago.

227
00:45:34,148 --> 00:45:35,441
{\an8}

228
00:45:48,871 --> 00:45:50,372
Jackson shows no fear.

229
00:45:57,129 --> 00:45:59,047
And his group get behind him.

230
00:46:59,107 --> 00:47:01,610
The westerners have been pushed back.

231
00:47:02,778 --> 00:47:03,946
And they're retreating.

232
00:47:16,250 --> 00:47:18,585
{\an8}

233
00:47:42,734 --> 00:47:45,195
The central chimps
have held off their rivals.

234
00:47:49,408 --> 00:47:51,535
But Jackson has been injured
in the battle.

235
00:48:10,554 --> 00:48:12,139
He defended his territory.

236
00:48:15,726 --> 00:48:16,935
But at what cost?