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By chest muscles I am assuming you mean the bird's breast. In that case they perform the same operation as the pectoralis major in humans which is horizontal adduction. Essentially bringing the limbs from the side of the body to the front. This is the motion required by the bird to push air downward during each stroke of its wing. These muscles allow the bird to fly.

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14y ago
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16y ago

the breast muscle

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8y ago

pecs

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14y ago

Sternum.

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Anonymous

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3y ago

cranium

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Q: What are chest muscles on a bird for?
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