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'''Vipers''' are a family of [[snake]] (the '''Viperidae''') found throughout the world except in [[Australia]] and [[Madagascar]]. Their bite is [[venom]]ous, which they use to catch small animals, such as [[lizard]]s and [[bird]]s, 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>
'''Vipers''' are a family of [[snake]] (the '''''Viperidae''''') found throughout the world except in [[Australia]] and [[Madagascar]]. Their bite is [[venom]]ous, which they use to catch small animals, such as [[lizard]]s, small [[mammals]] and [[bird]]s, 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>
The ''Viperidae'' family is divided into four subfamilies:
# ''Azemiopinae'' Liem, Marx & Rabb, 1971 (Fea's vipers) with only one species: ''Azemiops feae'' living in [[Myanmar]], southeastern [[Tibet]] across southern [[China]] (Fujien, [[Guangxi]], [[Jiangxi]], [[Kweichow]], [[Sichuan]], [[Yunnan]], [[Zhejiang]]) to northern [[Vietnam]].
#''Causinae'' Cope, 1859 (night adders) living in Sub-Saharan [[Africa]]
#''Crotalinae'' Oppel, 1811 (pit vipers: rattle snakes, bushmaster, cottonmouth, copperhead, jararacas) - In the [[Old World]] from eastern [[Europe]] eastward through [[Asia]] to [[Japan]], [[Taiwan]], [[Indonesia]], peninsular [[India]] and [[Sri Lanka]]. In the [[New World]] from southern [[Canada]] southward through [[Mexico]] and [[Central America]] to southern [[South America]].
#''Viperinae'' Oppel, 1811 (true or pitless vipers) living in [[Europe]], [[Asia]] and [[Africa]].
==References==
==References==