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The pitviper is a family of venomous snakes found in Eastern Europe, Asia and the Americas. Their habitat ranges from desert to rainforests. Pitvipers have a deep pit between the eye and the nostril on either side of the head. This is an organ that detects heat from warm-blooded prey. Common pitvipers include the bushmaster, copperhead and rattlesnake. Play the following videos to learn more about the pitviper snake.