chimpanzees

Chronicles an experiment with a young chimpanzee who was brought up with a human family and taught to use sign language proficiently, until the funding for the study ended and he spent two decades shuttled in and out of various facilities.

Describes the characteristics and habits of chimpanzees, including their group society, communication techniques, and intelligence.

When an old friend of her father's drops off an unusually intelligent chimpanzee at their apartment in the middle of the night with strict orders to keep the chimp a secret, twelve-year-old Rachel wants to know what the big mystery is all about.

While hurrying to get on the school bus, Arthur and his friend switch lunch boxes; later Arthur finds out what surprize his sister had into hers.

Follows a young chimpanzee as it learns from its mother how to extract termites from a hole by using a stick.