Chimpanzees, who share 98 percent of our genetic material, have developed some sophisticated behaviors. The chimps of Africa's Ivory Coast bang nuts against rocks to smash them open, then pry out the nutmeats. A nocturnal hunter native to the island of Madagascar, the aye-aye searches for beetle larvae nestled inside tree branches by tapping on the outer bark and listening for hollow spots. When it locates larvae, the aye-aye thrusts its long finger into the tunnel to dig out its food. This method also works well on the pulpy insides of coconuts, mangoes, and sugar cane.
Baboons live throughout East and North Africa.
While many baboon species live on open grasslands, some inhabit rocky, mountainous terrain, like the Hamadryas baboon of Egypt and Sudan. More earthbound than some of the other primates, baboons remain on the ground during the day, heading into the trees only to sleep at night. Baboons live in troops containing anywhere from 8 to 200 monkeys, each with its own social structure. When males threaten each other over females or territory, they show and audibly grind their teeth.