Reptiles have scales on their bodies and they breathe air. 爬行动物身上有鳞片，它们呼吸空气。

　　There are various kinds of reptiles. 爬行动物有多种多样。

　　They are snakes, alligators, lizards, turtles and so on. 蛇、鳄鱼、蜥蜴、乌龟等都是爬行动物。

　　The size of reptiles varies. 爬行动物的大小各异。

　　The smallest reptiles are geckos. 最小的爬行动物是壁虎。

　　It is about 1.6 centimeters. 它们不到1.6厘米长。

　　However, one of the biggest reptiles is a salt water crocodile. 然而，最大的爬行动物之一是咸水鳄。

　　It can grow up to 5.5 meters long and it weighs over 1,000 kilograms. 它能长到5.5米长、1000多公斤重。