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World's First Venomous Animals Identified

A paleobiologist has identified conodonts--a large group of tiny extinct marine animals that lived up to 500 million years ago--as likely being the world's first venomous animals. These animals, which lived until about 200 million years ago, are considered to have been jawless vertebrates. Most of their fossilized remains are teeth. (Four types of conodont [...]

December 15, 2009
9:42 AM EST

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