http://www.newscientist.com/article.ns?id=dn8769

‘Jurassic Beaver’ find stuns experts

Jurassic beaver-like creature

The newly found fossil of a beaver-like mammal that lived 164 million years ago reveals that early mammals were far more diverse than thought.

The semi-aquatic mammal Castorocauda lutrasimilis was discovered in the middle Jurassic Jiulongshan formation in Inner Mongolia, China, by Qiang Ji at Nanjing University, and colleagues. It boasts the oldest fossil fur ever found.

This, added to other recent mammalian finds, challenges the long-held view that the mammals living under the feet of the dinosaurs were tiny shrew-like animals.

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