This frog belongs to the family of Pelopatidae, or mud burrowers. Some members of this family use their back legs to burrow under mud, and others live in an aquatic environment. Darwinists claim that fish are the ancestors of amphibians, but they offer no proof to support this claim. On the contrary, scientific discoveries show that there are such important anatomical differences between the two species that it is impossible for amphibians to have evolved from fish. One of these scientific discoveries is the fossil record. According to the fossil record, the three basic classes of amphibian all appeared at once. The evolutionist Robert Carroll says, "The earliest fossils of frogs, caecilians, and salamanders all appear in the Early to Middle Jurassic. All show most of the important attributes of their living descendants." (Robert L. Carroll, Patterns and Processes of Vertebrate Evolution, Cambridge: Cambridge University Press, 1997, pp. 292-293.)