LOCOMOTION OF BIRD

Special Characteristic of Bird

• Its wing is aerofoil in shape.

• It has pectoralis major muscles & pectoralis minor muscles.

• These muscles are antagonistic muscles.

• These muscles extend from sternum to the humerus.

How Birds Fly?

• When the pectoralis minor muscles contract, the wings are pulled up (upstroke).

• When the pectoralis major muscles contract, the wings are pulled down (down stroke).

• The wings which move up and down rhythmically generate the forward thrust as well as provide the lift for the flying bird.

Diagram of Flying Bird

THE END