http://en.wikipedia.org/wiki/Mammal
The modern mammalian orders arose in the Paleogene and Neogene periods of the Cenozoic era, after the extinction of the dinosaurs 66 million years ago.
The modern mammalian orders arose in the Paleogene and Neogene periods of the Cenozoic era, after the extinction of the dinosaurs 66 million years ago.
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