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Class Reptilia

Reptiles are found in a small class of cold-blooded animals that are divided into four living orders (approx. 16 other orders are extinct). Reptiles are found throughout the entire world, from the steaming deserts to the inner city to hundreds of feet below the ocean. They are absent from the polar regions and mountain peaks. Reptiles share many common traits: they are all cold-blooded (meaning they can't regulate their body temperature); they have skin covered in scales or scutes (patches of bony or horny skin); the legs are short or entirely absent; and most are oviparous (they lay eggs), although some are ovoviviparous (eggs are kept in the mother's belly until they hatch). The egg yolk is rick and the shell is strong. Incubation is caused by the warmth of the ground, whether the eggs are laid in a nest (alligators) or buried (sea turtles). There is no larval stage with reptiles, unlike with amphibians. Also, the eggs are leathery instead of jelly-encased. There are 5000-6000 species of reptiles in four orders and three subclasses:

Subclass Lepidosauria
Rhynchocephalia (tuataras)
Squamata (lizards, snakes, amphisbaenas)
Suborder Sauria (lizards)
Suborder Serpentes (snakes)
Suborder Amphisbaenia (amphisbaenas)

Subclass Anapsida
Testudines or Chelonia (turtles, tortoises, terrapins)

Subclass Archosauria
Crocodylia (crocodiles, alligators, caimans, gavials, false gavials)