Today there are 6,800 reptile species on earth; the major groups are alligators/crocodiles, turtles, lizards, and snakes. All reptiles are cold-blooded, and have bodies covered in dry, horny scales. Some reptiles lay eggs; others give birth to live young. Reptiles are distinguished from amphibians by the presence of scales.
Did You Know?
Four species of pinnipeds (seals and sea lions) rest onshore or breed at Point Reyes: the Northern elephant seal (Mirounga angustirostris), the harbor seal (Phoca vitulina), the California sea lion (Zalophus californianus), and the Steller sea lion (Eumetopias jubatus). More...