Physical description
HabitatAlmost every biome except the polar regions
LifespanUp to 150 years, depending on the species
Average SizeFrom 2 centimeters to 6 meters
Average weightUp to 1 ton or more
Scientific classification
Distribution of speciesEvery continent except Antarctica
Reptiles are animals in the class Reptilia. They are characterized by breathing air, laying shelled eggs (except for some vipers and constrictor snakes that give live birth), and having skin covered in scales and/or scutes. Reptiles are classically viewed as having a cold-blooded metabolism. They are tetrapods (either having four limbs or being descended from four-limbed ancestors). Modern reptiles inhabit every continent with the exception of Antarctica, and four living orders are currently recognized:

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