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Nature 433, 116-117 (13 January 2005) | doi:10.1038/433116b; Published online 12 January 2005

Mammalian palaeobiology:  Living large in the Cretaceous

Anne Weil1

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Discoveries of large, carnivorous mammals from the Cretaceous challenge the long-held view that primitive mammals were small and uninteresting. Have palaeontologists been asking the wrong questions?

Although more than two-thirds of mammalian evolution occurred between about 180 million and 65.5 million years ago, many people think that these early mammals were not very exciting.

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