The four groups of reptiles

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How is a reptile? Do you know how a reptile is?

Reptiles come in different colors, shapes or forms, and sizes; but they all have some characteristics in common. Allreptiles have dry, scaly skin, and they all breathe using lungs, which are the organs that capture the air. Reptiles have cold blood, that means that if the temperature around changes, their bodytemperature will change, too. All reptiles belong to the class of animals called vertebrates because they all have backbones.

Zoologists, who study all kinds of animals, divide reptiles into four biggroups. The first group is formed by lizards and snakes. What would you do if you found a snake near you? This is the largest group, with almost 6,000 species existing today. They live in deserts andother warm places.

The second group consists of turtles. What is the special characteristic of turtles? Do you know what the special characteristic of turtles is? This characteristic, which is veryeasy to see, is that they have a shell. If I knew more about turtles, I would say that there are about 200 species of turtles living in hot climates in many parts of the world.

The third group isthe crocodilians, which includes alligators and crocodiles. Would you like to see an alligator or a crocodile? Do you know that there are only 23 species of these animals? Most live in fresh waters andswamps, which are kind of humid places. I will see an alligator or a crocodile any time I go to the swaps of Tabasco and Veracruz in Mexico.

The smallest group, which has only 2 species, is thetuatara. I hadn´t seen a tuatara before I wrote this article. Do you want to know how a tuatara is? The tuatara looks like a lizard, but it is more related to the dinosaurs ( I had seen a dinosaur inbooks before I studied other reptiles). The tuatara lives on several islands near New Zealand.

Although lizards, snakes, turtles, alligators, crocodiles, and tuataras are very different, they have...
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