A mountain gorilla (Africa - BBC)

A mountain gorilla (Africa - BBC)

A siamang (Natural World - BBC)

A siamang (Natural World - BBC)

A young chimpanzee tries to crack a nut. (Chimpanzee - Disneynature)

A young chimpanzee tries to crack a nut. (Chimpanzee - Disneynature)

A young chimpanzee enjoys some fruit. (Chimpanzee - Disneynature)

A young chimpanzee enjoys some fruit. (Chimpanzee - Disneynature)

A young orangutan explores the kitchen of a sanctuary for orphaned apes in Borneo. (Born to be Wild)

An orphaned orangutan at a sanctuary in Borneo. (Born to be Wild)

A four-year-old Western Lowland Gorilla plays with his younger brother. (Mystery Gorillas - National Geographic Channel)