George A. Feldhamer is the chair of environmental studies and an emeritus professor of zoology at Southern Illinois University. He is the founding author of Mammalogy: Adaptation, Diversity, Ecology and the editor or author of numerous books, including Wild Mammals of North America and Deer: The Animal Answer Guide. James M. Ryan is an emeritus professor of biology at Hobart and William Smith Colleges. He is the author of Mammalogy Techniques Lab Manual. Carey Krajewski is a retired professor of zoology at Southern Illinois University and a former associate editor of the Journal of Mammalian Evolution. Janet L. Rachlow is a professor of wildlife ecology at the University of Idaho. Kelley M. Stewart is an associate professor of wildlife ecology and conservation at the University of Nevada, Reno.