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Pectoralis major (Depressor muscles)
These are the largest breast muscles. They are about one fifth of the body weight. By the contraction of this muscle the wings are lowered during flight.
Pectoralis minor or subclavius :-
These are smaller but longer than pectoralis major. By their contraction
 the wings are raised in flight.
Coracobrachialis :-
These small flight muscles pull the wing downwards in flight. 
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