Wildlife is abundant on Mount Diablo. Coastal black-tailed deer, raccoons, California ground squirrels, eastern fox squirrels, and gray foxes are often seen. Skunks, bobcats, mountain lions, badgers, coyotes, rabbits, hares and many other animals call the mountain home as well. Mount Diablo is known to harbor red-legged frogs, tarantulas, and the rare Alameda whipsnake as well as its cousin, the northern rattlesnake.