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Wikipedia definition
1. ViperidaeThe Viperidae are a family of venomous snakes found all over the world, except in Antarctica, Australia, Ireland, Madagascar, Hawaii, various other isolated islands, and north of the Arctic Circle. All have relatively long, hinged fangs that permit deep penetration and injection of venom. Four subfamilies are currently recognized. They are commonly known as vipers or viperids.
Read “Viperidae” on English Wikipedia
Read “クサリヘビ科” on Japanese Wikipedia
Read “Viperidae” on DBpedia

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