William Henry Burt (22 Jan 1903-4 Dec 1987), American zoologist and mammalogist.who studied various aspects of mammalogy, including home range, territoriality, morphology, behavior, and evolution. The regions he studied in particular include Michigan (1940-48), the Great Lakes (1956), Sonora (1938-41) and El Salvador (1961). He also examined the effects of the new Mexican volcano Paricutin on the vertebrates in its vicinity (1961). His interest in mammals developed early, from observing activities of prairie dogs on the family farm. As early as 1927, he wrote about A Simple Live Trap for Small Mammals in early article, in the Journal of Mammalogy. This led to development of the live trap, now widely used by mammalogists worldwide. Of his several books, his book, Field Guide to the Mammals (first published 1952), has popularized mammal observation by the layman.