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A chimp has been killed
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in the heart of the Ngogo territory.
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It's Pork Pie.
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For this to happen,
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the killers had to enter
the territory unnoticed.
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Only one other group could have done this.
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A group the Ngogo chimps
know only too well.
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The westerners.
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War is coming to Ngogo.
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The chimps of western Ngogo
are a separate group
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with their own territory.
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The westerners are different.
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Their group is much smaller
than Jackson's central group.
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But they stick together.
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And that gives them strength.
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There are just eight adult males
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compared to 24 in the central group.
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So the females
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stand together with the males
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and help defend the territory.
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{\an8}There's a strong alpha, Hutcherson,
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but he's different to Jackson.
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He doesn't dominate in the same way.
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Here, power is shared more equally.
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And all the adult males
have important roles.
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{\an8}Garrison is one of those males.
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He's getting old for a male chimp,
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but with age comes knowledge.
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He knows every tree at Ngogo.
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He has a map
of the entire forest in his head.
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If there's food to be found,
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he'll find it.
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Foraging is hard work.
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Often for small rewards.
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This time, Garrison has led the westerners
to a rare treat.
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Chimps love wild honey.
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But it doesn't last long,
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and it won't feed the whole group.
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For that,
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the westerners need fruit.
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Ripe fruit
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is the most important food at Ngogo.
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And right now,
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the most prized fruit trees are
at the edge of the western territory.
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On the border
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of Jackson's central group.
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{\an8}Rollins is the west's patrol leader.
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He's been guarding
the borders of Ngogo for many years.
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Damien is his younger brother.
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He's still just a teenager.
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But he's already strong...
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confident...
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...and very smart.
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On visits to the borderlands,
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it's these formidable brothers
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who lead the way.
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As they get closer to the border,
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Garrison keeps a watchful eye on everyone.
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They've entered the borderlands.
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Jackson's central group also feed here,
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so it's a dangerous part of the forest.
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{\an8}But it's worth the risk.
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There's a huge fig tree in full fruit.
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Exactly what the group needs.
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Most of the group are happily feeding.
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Rollins and Damien
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are not.
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Patrolling is partly
about guarding resources.
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But that's not all.
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Chimps will always try
to expand their territory if they can.
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And they do it
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by finding and attacking rivals.
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If they can outnumber them.
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So Rollins and Damien can't go alone.
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The other males
will need to follow close behind.
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They are moving deep
into central territory.
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Their group is small,
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and they don't know how many enemy chimps
they might encounter.
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They must be careful
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and quiet.
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Damien has been with Rollins
his whole life.
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The connection between them is strong.
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On a stealth mission,
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that can be the difference
between life and death.
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The patrol has heard something.
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It's Pork Pie.
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And he's alone.
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Like humans,
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chimpanzees are social creatures.
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But unlike us,
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their ability to form relationships
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is limited to members of their own group.
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They are inescapably territorial
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and tribal.
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It's in their nature
to compete for resources.
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And to see chimps
from rival groups as others,
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to be attacked and destroyed.
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Chimpanzee life is
a never-ending conflict.
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To the westerners,
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Pork Pie was an outsider.
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And once they found him alone,
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his fate was sealed.
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All chimps have two sides.
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Adult males like Rollins
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can be gentle and playful.
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And they can be brutally violent.
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But that violent side
is essential to this society.
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Territorial conflicts between groups
are not a battle for wealth.
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They are a battle for survival.
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The westerners have many mouths to feed.
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And the group is growing.
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They need more territory.
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And more food.
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They are in conflict
with a bigger, more powerful group.
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So the odds are stacked against them.
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For now.
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The western group might be smaller...
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but it's united.
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There's a strong sense of togetherness.
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And support.
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Garbo is the oldest chimp at Ngogo.
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Sixty-five is an incredible age
for a chimpanzee.
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And she still plays her part
in the community.
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It helps that her son is the alpha.
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With him to look out for her,
Garbo has a good life...
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...and is treated with respect.
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Garbo has another son...
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Richmond.
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Who also takes care of his mother,
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despite his own problems.
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As a young chimp,
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Richmond lost his hand
to a poacher's snare.
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Even though everything in the forest
is more difficult...
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he hasn't just survived,
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he's prospered.
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Richmond was once the western alpha,
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until his younger brother
replaced him at the top.
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But he still has power
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and influence.
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The small number
of adult males in the west
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puts them at risk if their rivalry
with the central group escalates.
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There are younger males on the way up.
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{\an8}But the journey can be difficult.
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Bergl is an orphan,
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so he's had to grow up quickly...
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...and find ways to get by.
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But as an adolescent male,
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he's changing
and wants to start asserting himself.
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He's trying to perform dominance displays.
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He needs to be careful.
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He's beginning to attract attention.
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At this stage of a male chimp's life...
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...the established males
start to see them as a rival.
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Bergl's little displays
are enough to get him in trouble.
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One day, Bergl's aggression
might help the west against their enemies.
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For now, he's been put in his place
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and has picked up a nasty hand injury.
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{\an8}Joya is also an orphan.
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{\an8}She's the same age as Bergl.
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And she's also beginning to change.
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Her maternal instincts
are starting to develop,
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and she wants to help out
with the infants.
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With no mother to learn from...
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...her parenting skills
are a work in progress.
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Unlike Bergl, when it comes to Joya...
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everyone is very tolerant.
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And there are experienced mothers
she can use as a role model.
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Carson already has two children.
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And she's pregnant again.
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She's a good mother,
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but here in the west, she has to be more.
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She joins the males on patrol.
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And she hunts.
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The westerners hunt as a group.
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Males and females,
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side by side.
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Black-and-white colobus monkeys
are not an easy target.
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They're fast and agile.
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And to catch them,
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the chimps must work together.
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Hunting is tough for Richmond.
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But he knows it's worth keeping up.
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It's a successful hunt.
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And there's meat to be shared
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in the treetops.
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If Richmond wants his cut,
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he'll need to go up and claim it.
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Garbo was too old for the hunt,
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but that doesn't mean
she can't get a share.
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Garbo provided for Richmond
as he was growing up.
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And now he provides for her.
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Life can be tough at Ngogo.
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And having a family to rely on
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can make things a little easier.
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Most chimps have a strong bond
with their mother.
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But Bergl has no family.
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All male chimps go through this stage.
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And they all get
a few beatings along the way.
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But things are harder for an orphan.
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With no mother to comfort him...
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Bergl is spending time alone.
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It's not just bonding he's missing.
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Grooming is essential for staying healthy.
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Without it,
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Bergl could be vulnerable.
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Chimps don't normally do much in the rain,
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but the westerners aren't taking shelter.
208
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They all seem energized by the storm.
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As a group...
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00:35:04,895 --> 00:35:06,605
...they're growing stronger.
211
00:35:29,461 --> 00:35:30,796
Bergl is still alone.
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00:35:32,882 --> 00:35:34,133
And he's become sick.
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00:35:36,844 --> 00:35:39,513
His face is infected by a parasite.
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00:35:56,322 --> 00:35:57,323
He needs help.
215
00:36:18,052 --> 00:36:21,096
A duiker would normally
be afraid of a chimp.
216
00:36:23,515 --> 00:36:24,642
But in this state,
217
00:36:26,101 --> 00:36:27,311
Bergl is no threat.
218
00:36:48,624 --> 00:36:51,627
Most of the group
haven't noticed Bergl is missing.
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Someone has though.
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As they get older,
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00:37:31,166 --> 00:37:33,335
male chimps become less aggressive
222
00:37:34,628 --> 00:37:35,629
and more caring.
223
00:37:40,134 --> 00:37:41,093
And sometimes,
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they'll step in to take care of an orphan.
225
00:37:50,477 --> 00:37:52,646
The western group needs Bergl.
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00:37:53,939 --> 00:37:55,899
But if he's going to find his place,
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00:37:55,899 --> 00:37:58,402
he'll need to learn
to control his aggression.
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00:38:03,741 --> 00:38:06,910
And with a chimp
as experienced as Garrison to support him,
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00:38:07,911 --> 00:38:08,746
there's hope.
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00:38:18,839 --> 00:38:21,925
Joya is spending
more and more time with the infants.
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She's learning.
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00:38:28,432 --> 00:38:31,518
And when the time comes
to start her own family,
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00:38:31,518 --> 00:38:32,811
she'll be ready.
234
00:38:38,942 --> 00:38:41,153
Bergl and Joya are finding their way.
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00:38:43,614 --> 00:38:47,117
Slowly learning to play their roles
in chimp society.
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00:39:01,632 --> 00:39:03,884
That society needs to be sustained.
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00:39:06,595 --> 00:39:08,931
So, like every day of their lives,
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00:39:09,431 --> 00:39:12,893
the westerners must set out
to search for food.
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00:39:37,042 --> 00:39:39,545
Damien has discovered something.
240
00:39:41,797 --> 00:39:43,799
And it's not an everyday piece of fruit.
241
00:39:48,720 --> 00:39:49,888
It's Chrysophyllum.
242
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The rarest, richest bounty of Ngogo.
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It appears in a massive crop
once every few years.
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00:40:07,030 --> 00:40:08,198
It's unpredictable,
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00:40:09,158 --> 00:40:10,534
and when it happens,
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00:40:13,454 --> 00:40:16,331
it provides more food
than the chimps can eat.
247
00:40:31,263 --> 00:40:33,307
Most of the Chrysophyllum trees
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lie over the border
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in the central territory.
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But the western males know
exactly where to find them.
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00:41:01,126 --> 00:41:02,711
Because for many years,
252
00:41:03,670 --> 00:41:04,963
those trees
253
00:41:05,881 --> 00:41:07,174
and that territory
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00:41:08,342 --> 00:41:09,843
belonged to them.
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00:41:22,314 --> 00:41:23,941
And now the time has come
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to take it back.