why when bird push their wind backward they move forward
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When they puch backward the friction thus opposes it provide forward reaction.
ddegner:
Flapping: When birds flap, the stroke of their downbeat moves the wing tips forward and downward. The wingtips make a loop at the bottom of the downstroke, and as the wings move up, the wing tips move upward and backward. ... And as they move forward, the rush of air on their airfoil wings causes more lift.
Answered by
2
To cut the air flow in atmosphere and to fly against the breeze or the wind.
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