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Reptiles are among the planet's oldest creatures—crocodilians, for instance, have been terrorizing smaller animals for approximately 200 millions years. But the majority of reptiles are unable to internally regulate their body temperature and so live in temperate and tropical climates. Some bear live young, but typically, reptiles lay eggs which develop miniature adults.
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CrocodiliansSurvivors from the time of the dinosaurs, this fierce family includes crocodiles, alligators and caimans. |
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TurtlesA hardy carapace or shell provides a measure of protection for these often water- dwelling reptiles. |
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SnakesThe inspiration for many a phobia, snakes are a diverse family with many unique adaptations. |
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Gila MonsterOne of only two species of venomous lizards on the planet, the gila monster faces serious threats to its habitat. |
Nature picture credits (top to bottom): Nile crocodile © Robert Dawson; Blanding's turtle © TNC; Anaconda © Photos.com; Gila Monster © Bob Kupbens.