article: Viper
links: Family (biology) Viperinae Sichuan Central America Causinae Sauropsida Animal Old World Azemiopinae Africa Japan Pupil (eye) New World Yunnan Canada Edward Drinker Cope Sub-Saharan Africa Indonesia Snake Vietnam Squamata Crotalinae India Sri Lanka Taiwan Mexican west coast rattlesnake Tibet Guangxi Asia Mexico China Predation Myanmar South America Jiangxi Zhejiang Vertebrate Europe