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Hollow bones in birds...

Externet
in Evolution, Morphology and Exobiology

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How does air gets in the hollow of bird bones ? Is it somehow renewed or stale ?

How does air gets in the hollow of bird bones ? Is it somehow renewed or stale ?

Interesting question. Apparently the hollow bones are connected to the respiratory system and the air is renewed.

 

Lung -Avian

...The lungs of birds are relatively small, but are connected to 89 air sacs that extend through much of the body, and are in turn connected to air spaces within the bones. ...

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