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mammal

Hairy, warm-blooded vertebrates that nourish their young with milk (hence the name). About 5,500 species in all, and all descended from a common ancestor of the anteater, platypus, marsupials like the kangaroo, and placentals. The extinction of the dinosaurs 65. 5 million years ago made way for the growth of large mammals. 40% are rodents.

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