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?
40 percent of all debris items picked up during California Coastal Cleanup Days are cigarette butts. In 2008, volunteers picked up over 340,000 of them in only three hours. 2008 was the 24th straight year in which cigarette butts were the most numerous debris item picked up. More...