—Reptiles.

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Reptiles (the class Reptilia) comprise today’s turtles, crocodilians, snakes, lizards, and tuataras, and many other extinct groups. A reptile is any amniote (tetrapod that can lay eggs on land) that is neither a mammal nor a bird. Modern reptiles have scales or scutes (not fur or feathers) and are cold-blooded. The earliest known reptiles originated around 320–310 million years ago during the Carboniferous period, evolving from amphibians that became increasingly adapted to life on dry land.

reptilesTINY CHAMELEONS (Brookesia micra)

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Brookesia micra on a homo sapiens digit.
PHOTO: Frank Glaw

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Brookesia micra on the tip of a wooden match stick.
PHOTO: Frank Glaw

One of four species of tiny reptiles recently discovered on the African island of Madagascar. Three of the four species are endangered by human activity (habitat destruction).

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VISIT:
Amphibians Arthropods Birds Gastropods Mammals Tardigrades

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