How Birds Survived the Dinosaur Apocalypse
When nearly every dinosaur went extinct 66 million years ago, the only ones that survived were those that had shrunk—that is, the birds. Today, there are 10,000 species of these feathered fliers, making them the most diverse of all the four-limbed animals. A new study reveals why this lineage has been so successful: Birds started downsizing well before the rest of the dinosaurs disappeared.
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