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Bald Eagle. Credit: Wikimedian AngMoKio.
bird:
A class of animals which has feathers, is warm-blooded, lays eggs, and has wings. Most birds can fly, though some, such as the penguin, cannot. Birds have hollow, light-weight bones and strong breast muscles for moving their wings. There are about 8,000 different kinds of living birds. They range in size from the ostrich, which can weigh over 300 lbs (136 kilograms) to the humming-bird, which weighs about as much as a paperclip.
