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Audio Video Interleaved Video  |  1995-04-25  |  1.3 MB  |  224x164  |  4fps  |  30 seconds  |  [VfW /VfWC]
Transcription: Most birds are well adapted to flying. They have streamlined bodies and feathered wings. When a bird flaps its wings, it pushes downward against the air. This pushes the bird upward. Flapping also produces a backward push. As a result, the bird moves forward. Birds can stay airborne without flapping their wings. This is because air flowing over and under the wing generates an upward force called lift.