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The extinction of so many organisms left a large ecological niche to expand into, which mammals did.

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Q: How does the Cretaceous-Tertiary extinction relate to the age of Mammals?
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Did animals have fur during the dinosaur age?

Primitive mammals, with fur, did exist during the age of dinosaurs. It has sometimes been speculated that mammals caused or helped to cause the extinction of the dinosaurs by eating dinosaur eggs.


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Why did mammals increase after the age of dinosaurs ended?

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Is Autobot Hound a smoker in Age of Extinction?

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