What does a bird supply by flapping its wings?

1. What do birds generate by flapping their wings?
2. Is a bird flapping its wings mechanical energy?

What do birds generate by flapping their wings?

Getting the air to move over and under the wing also requires the wing to be moving. This is called thrust. Thrust is created when birds flap their wings using their strong breast muscles. Planes use another method for thrust.

Is a bird flapping its wings mechanical energy?

The bird gains both kinetic and potential energy during the flapping phases. A new theoretical model indicates that such speed variation can give significant savings in mechanical power in both bounding and undulating flight.