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Science 24 February 2006:
Vol. 311. no. 5764, pp. 1109 - 1110
DOI: 10.1126/science.1124294
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Perspectives

PALEONTOLOGY:
Early Mammalian Evolutionary Experiments

Thomas Martin

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.

The author is in the Mammal Section, Forschungsinstitut Senckenberg, 60325 Frankfurt am Main, Germany. E-mail: tmartin{at}senckenberg.de

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Science. ISSN 0036-8075 (print), 1095-9203 (online)