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birds

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A class of vertebrates distinguished by their feathers and their two legs and two wings. Birds are warm-blooded animals, and their young hatch from eggs.

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notes for birds

Some scientists argue that modern birds are descended from the dinosaurs.
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

How to use birds in a sentence

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