Question

Muscles that help the bird to move it's wings up and down​

Answer 1

Birds power flight primarily by large pectoralis muscles that depress the wings at the shoulder.

Answer 2

There are 2 large muscles that help a  bird to move it's wings up and down namely 1) pectoralis & 2)supracoracoideus.

• The supracoracoideus raises the wing while the pectoralis lowers it.

• The supracoracoideus lies in the angle between the keel and the plate of the sternum along the coracoid. It is able to achieve pully-like action.

• The pectoralis attaches directly to the head of the humerus lying above supracoracoideus.
• supracoracoideus is way smaller than the pectoralis in most birds.