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#13
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Wallace Berry wrote:
The bagpipe is a good analogy, with the bird's airsacs as the bags, and the drones and chanter of the pipe analogous to the lungs. Birds lungs are rigid and don't expand and contract the way mammalian lungs do. All the bellows work is done by the airsacs. But all this doesn't solve the main problem: low partial O2 pressure. Stefan |
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