This is one of them.
From the purposeful way in which he's walking,
it's clear that the search for prey has started.
The other members of the team aren't far away.
They've been steadily following the monkeys for about 20 minutes,
looking for an opportunity.
The technique they'll amost certainly use
is that one of them will be driving the colobus ahead of him,
then there will be others that go up on either side
who are the blockers, who won't make any attempt to catch the monkeys.
And then there are pacers who go and grab at the monkey if they can.
And finally there's one male who will go up ahead
and ambush it, so bringing the whole trap closed.
The monkeys are now getting alarmed.
A driver is going up to prevent the group from settling
and to drive them towards an area where they're more easily trapped
That's one of the blockers that has now quietly come ahead of the colobus
and he's halfway up the tree now.
He's deliberately making himself conspicuous.
Now it looks like they're all in position.
The drivers have gone up, the blockers have gone up.
And now the one who's going to make the ambush and close the ring,
he's gone up too.
The colobus will be very lucky if they escape now.
They've got one!
The hunters are tearing it apart.
Everyone, the hunters of the trees and the spectators on the ground,
are screaming with excitement.
Now the kill is brought down,
so that the females and others can share it.
And there's a reward for that long chase,
the divided body of a colobus monkey.
These blood-stained faces may well horrify us,
but we might also see in them the face of our long distant hunting ancestors.
And if we are appalled by that mob-violence bloodlust,
we might also see in that too, perhaps,
the origins of the teamwork
that have in the end, brought human beings many of their greatest triumphs.