Final answer:
The pectoralis major muscles on the ventral side of birds, attached to the keel of the sternum, are vital for powered flight, working in coordination with the supracoracoideus muscles. The fusion of clavicles in birds forms the wishbone, offering support during flapping, and the sternum is adapted to accommodate the flight muscles required for lift.
Explanation:
The pectoralis major muscles on the ventral side of birds, specifically attached to the keel of the sternum, are crucial for powered flight. These muscles work alongside the supracoracoideus muscles to move the wings during flight, with the pectoralis major responsible for the downstroke.
The fusion of the clavicles in birds forms the furcula or wishbone, providing support to the shoulder girdle during flapping. The sternum of birds is adapted to accommodate the large flight muscles needed for generating lift while flying.
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