As a young student, John Crocker embarked on the adventure of a lifetime, spending eight months in the Gombe forest working with Jane Goodall. He followed families of wild chimpanzees from sunrise to sunset and learned the fundamental behavioral traits of these chimps as they raised their offspring. One chimpanzee captivated him. Her name was Fifi, and she displayed extraordinary patience and reassurance toward her infant, Freud. Upon returning...