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How do tthe air sacs of birds help make the body lighter?

How do tthe air sacs of birds help make the body lighter?air in the bones lighten the wholww skeleton:
http://www.backyardnature.net/birdbone.htm
But the 9 breathing air sacs do not really lighten the bird except to possibly allow smaller lungs:
http://www.people.eku.edu/ritchisong/birdrespiration.html

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