This 1975 non-fiction book details the experience the author and his family had of raising a baby female chimpanzee they named Lucy (1964-1987). Lucy learned to communicate using sign language, and interact with her human family and friends, while her psychotherapist "father" observed her growth and behavior. Lucy was the first chimpanzee successfully raised among humans from infancy to sexual maturity, at about age eight. See link to Wikipedia article for information about her life following this book.