How are birds different than us ?
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Whereas birds have feathers, lack teeth and lay eggs, mammals have fur or hair for insulation, possess teeth and give birth to live young. Although birds are more closely related to reptiles than mammals, birds and mammals have several characteristics in common.
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The main difference between the human and bird skeleton is that the bird's skeleton is adapted for flight. The bones of a bird are hollow which makes the skeleton lighter. A bird's sternum is large and positioned under the body - flight muscles attach to this bone. The ridge of the bird's sternum is called a keel. Plus, humans are not adapted to fly.
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