In a video slideshow, Woods Senior Fellow Paul Ehrlich (Biology) describes the unique characteristics and chances of extinction for various species. Ehrlich's latest book, co-authored with Gerardo Ceballos and Anne Ehrlich, is The Annihilation of Nature: Human Extinction of Birds and Mammals. All proceeds from the photo-rich book will go to the Navjot Sodhi Fund at the Rocky Mountain Biological Lab to support research by young conservation biologists.