PerspectivePaleontology

Early Mammalian Evolutionary Experiments

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Science  24 Feb 2006:
Vol. 311, Issue 5764, pp. 1109-1110
DOI: 10.1126/science.1124294

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Summary

Before the extinction of the dinosaurs, most early mammals were thought to be small, nocturnal, and terrestrial. A new large Middle Jurassic fossil with fur and a beaverlike tail suggests that some were aquatic.

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