What is the Difference Between True Vipers and Pit Vipers?

All vipers fall under the family Viperidae. However, it contains two sub-families that distinguish between what we call “True Vipers” and “Pit Vipers.” The distinction is whether or not a viper has heat-sensing organs, which we call “pits.” Pit Vipers have these heat-sensing organs and belong to the subfamily Crotalinae. True Vipers, on the other hand, lack these heat-sensing organs and belong to the subfamily Viperinae.

Some genera under Crotalinae include Agkistrodon, Bothrops, Crotalus and Trimeresurus

Some genera under Viperinae include Atheris, Bitis, Cerastes, and Echis.

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