A field biologist since 1972, Packer began his work studying primates at Gombe and then the lions of the Serengeti and the Ngorongoro Crater with his wife and colleague Anne Pusey. Here, he introduces us to the real world of fieldwork—initiating assistants to lion research in the Serengeti, helping a doctoral student collect data, collaborating with Jane Goodall on primate research.  (EAF77, $27.50)