Within historic times, pronghorn, gray wolf, red wolf, and brown bear were all found in Missouri, but have since been extirpated. American bison and elk were formerly common, but are currently confined to private farms and parks. Elk can be found in a small restoration zone in three counties in the southeast Ozarks.
^Johnson, Tom R. The Amphibians and Reptiles of Missouri: Missouri Department of Conservation, 1992
^Briggler, Jeffrey T. and Tom R. Johnson, Missouri's Toads and Frogs, MO Department of Conservation, copyright 1982, 2008, Missouri Conservation Commission.