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Fossilized remains of a snake. The snakes evolved from monitor-like lizards some time toward the end of the Cretaceous Period (65 million years before present). The first types to evolve were the boas and pythons; the venomous snakes are not known before the Eocene Period (c.30 million years BP). (1991)

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USA_SCI_FOS_07_xs.jpg
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©Peter Menzel, www.menzelphoto.com
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Fossils
Fossilized remains of a snake. The snakes evolved from monitor-like lizards some time toward the end of the Cretaceous Period (65 million years before present). The first types to evolve were the boas and pythons; the venomous snakes are not known before the Eocene Period (c.30 million years BP). (1991)
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