It is home to the Greater Short-horned Lizard (Saskatchewan's only lizard species), the Black Footed Ferret (the most endangered mammal in North America) and Pronghorn (the second fastest land mammal in the world).
The Texas coastal prairie/marsh ecosystem originally supported large populations of alligators, bullfrogs, white-tailed deer, American bison, Pronghorn, American Black Bear, Eastern wild turkey, red wolf, Eastern Gray Squirrel, fox squirrel, and muskrat.