The flying of birds is a consequence of Newton's:

پرندوں کا اڑنا نیوٹن کونسےقانون کا نتیجہ ہے

First law of motion

second law of motion

third law of motion

both first and second laws of motion

According to Newton's third law of motion, air strikes the wings in opposite directions.

When a bird is flying, the bird pushes the air with its feather in the backward direction (action),

and the air, in turn, pushes them forward due to the force of reaction.