“Three groups of reptiles” Discovery Education Video Transcript
Into three major groups the first, and largest, contains snake and lizards this stately specimen is an iguana from Central America. Like all other reptiles, both snakes and lizards are cold-blooded. That's to say their body temperature stays close to that of their surroundings. And, with the exception of a few species, Such as this water snake, Most of the world's many snakes and lizards live on dry land. Turtles are the next big reptile group. They, as our little friend here demonstrates, are the only reptiles with a shell. There are many kinds of turtles. Some, such as this giant tortoise, live on land, while others are at home in fresh water. In addition, some turtles, Such as the one these scientists are studying, spend most of their lives in the ocean. Alligators, crocodiles, and their kin Make up the last major reptile group. Powerful predators, these mighty reptiles spend much of their time in the water or sunning themselves on the shore nearby.