The chimpanzee Rafiki with her twins, Roots and Shoots

Two chimpanzees share fruit

An angry adult male chimpanzee (Pan troglodytes)

AIDS research using chimpanzees as research subjects

A close-up of one of the many chimpanzees that were studied by researcher Jane Goodall

Two of the many chimpanzees at Gombe Stream National Park in Tanzania

A female chimpanzee and her baby rest in the branches of a tree

A male chimpanzee dubbed Cole lounges in the branches of a tree

Vocalizing chimpanzee

A volunteer touches the hand of a chimpanzee in the Freetown Zoo

Portrait of the chimpanzee Fifi

A silhouette of a chimpanzee sitting in a tree

Chimpanzee

A chimpanzee in a tree

Young chimpanzee playing in tree

Portrait of chimpanzee in the Mahale Mountains National Park

An orphaned chimp finds comfort clinging to a human caretaker

An adult chimpanzee hoots aggressively at visitors

A close-up of one of the many chimpanzees studied by Jane Goodall at Gombe Stream National Park

Two of the many chimpanzees studied by Jane Goodall at Gombe Stream National Park

Two chimpanzees groom each other in Gombe Stream National Park

A close-up of one of the many chimpanzees at Gombe Stream National Park

One of the many chimpanzees studied by Jane Goodall at Gombe Stream National Park

A captive female chimpanzee with its infant

A young pygmy chimpanzee sits in the tall grass

An obliging chimp shows off the splayed big toe typical of ape feet

Social climbers sound off at a chimp klatch in a tree

A chimpanzee with grass in its mouth at the San Fransisco Zoo

Fosforos, El Mono

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