Robert C. Stebbins is Professor Emeritus of Zoology at the University of California, Berkeley and a curator emeritus of the University s Museum of Vertebrate Zoology. The author of over a dozen books, his latest work is "Connecting with Nature: A Naturalist's Perspective." Samuel M. McGinnis is Professor Emeritus of Biology at California State University, East Bay. He is the author of another California Natural History guide, "Freshwater Fishes of California"