Dinosaur Extinction Spurred Rise of Modern Mammals, Study Says

Publication: National Geographic News   Date: June 20, 2007   View Article

The asteroid that finished off the dinosaurs 65 million years ago opened up niches for the majority of today’s living mammals, according to a new study.

The finding is the latest volley in a long-simmering debate over when and where the direct ancestors of everything from whales to rats to humans first arose.

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