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Vipers are a species of [[snake]] found primarily in moist environments, such as [[rainforests]] and [[caves]]. Their bite is [[venom|venomous]], which they use to catch small animals, such as [[lizards]] and [[birds]], that constitute their diet. Viper venom can be fatal to humans if treatment is not sought. Like many snakes, vipers have special organs that allow them to sense [[infrared]].

Vipers are a species of [[snake]] found primarily in moist environments, such as [[rainforests]] and [[caves]]. Their bite is [[venom|venomous]], which they use to catch small animals, such as [[lizards]] and [[birds]], that constitute their diet. Viper venom can be fatal to humans if treatment is not sought. Like many snakes, vipers have special organs that allow them to sense [[infrared]].<ref>http://www.amersol.edu.pe/ms/7th/7block/jungle_research/new_cards/11d/report11d.html</ref>