I became acquainted with other animals: troops of vervet and redtail monkeys; the beautiful red colobus monkey; the shy bushbuck; the fat ginger bush pig.

An afternoon at the beachside Bijilo Forest Park - a mile up the coast - gave us the chance to wander among baobabs, spotting hornbills, red colobus and green vervet monkeys.

Chimpanzees gather to hunt colobus monkeys, but Dr. Tomasello argues this is far less of a cooperative endeavor because the participants act on an AD hoc basis and do not really share their catch..