Roland W. Kays is the Curator of Mammals at the New York State Museum. His research centers on the ecology and conservation of temperate and tropical mammals, especially carnivores. Don E. Wilson is Senior Scientist at the Smithsonian Institution's National Museum of Natural History. Recipient of a Smithsonian Institution Award for Excellence in Tropical Biology and a U.S. Fish and Wildlife Service Outstanding Publication Award, he is the author or coauthor of more than 180 scientific papers and twelve books, including three volumes on bats, The Smithsonian Book of North American Mammals , and Mammal Species of the World .