Explain the role of drag and thrust in bird flight

Drag is a force that acts in the opposite direction to the bird's motion, and it is caused by the resistance of the air to the bird's movement. Birds have streamlined bodies and wings that are shaped to reduce drag and increase lift. The shape of a bird's wings creates an airfoil that produces lift as air moves over the top of the wing faster than it does beneath the wing. This pressure difference creates an upward force that helps the bird to stay aloft. ________ ______ ______ __________ _____.
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