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| | Viper,Reptiles,Amphibians,Viper Picture Gallery Collection,Viper Pictures,Encyclopedia,Viper |
 | | The viper family, Viperidae, is usually divided into two subfamilies: the Viperinae, or true vipers, and the Crotalinae, containing the PIT VIPERS. |
 | | Most vipers are heavy bodied and terrestrial; however, some have become adapted to life in the trees and are bright green with prehensile tails (Bothrops, Trimeresurus, and Atheris). |
 | | In the tropics vipers may breed every year, but species inhabiting colder regions (such as the northern United States, Canada, and Europe) and at least one species from the highland tropics are unable to acquire sufficient food reserves to produce young annually. |
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