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There are four main groups of reptiles: turtles and tortoises; lizards and snakes; crocodiles and alligators; and the tuatara. Many reptiles spend most of their time on land, but some spend a great deal of time in the water. ReptileA cold-blooded, air-breathing animal that has a backbone. Reptiles have dry, scaly skin. They move by either creeping on short legs or crawling on their bellies. Most reproduce by laying eggs. speciesA group of individuals that have many of the same characteristics, and are different from all other animals in some important way. Hamsters and mice are two different species of rodent. can be found in all types of habitatWhere an animal or plant normally lives and grows. except polar ice and tundraIn arctic or subarctic regions, a flat or gently-sloping plain that features low-lying plants and bushes, but no trees. Underneath the topsoil, the ground is often frozen..