HERPETOFAUNA is the term that encompasses all amphibians (frogs, salamanders, and caecilians) and reptiles (snakes, lizards, turtles, crocodilians, and tuataras). Although two different vertebrate classes (Amphibia and Reptilia) are included, many species of both groups occupy the same habitats throughout the world and are faced with the same environmental perils (see threats to herpetofauna). Sometimes the shorter word HERP is used instead of Herpetofauna, but the meaning is the same: amphibians and reptiles.