PETER MENZEL / SCIENCE PHOTO LIBRARY PETER MENZEL / SCIENCE PHOTO LIBRARY
Fossilised 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).
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