Having risen to power as chief of his people, the Storn, sixteen-year-old Sigurd leads them as they try to resist the bloodthirsty invaders known

A personal, scientific account of the ground-breaking Project Koko discusses Patterson's controversial experimental program of teaching sign lang

Pursued by power-hungry Prentiss and mad minister Aaron, young Todd and Viola set out across New World searching for answers about his colony's t

In 1973, when a renowned Canadian behavioral psychologist pursues his latest research project-- an experiment to determine whether chimpanzees ca

This story of Alex, a famous African Gray parrot, documents his thirty-year relationship with his trainer and the ways in which his life has chan