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News stories tagged with "air-sacs"

Natural Selections: How Birds Breathe

Respiration in birds in different from mammals and reptiles. In addition to lungs, birds have air sacs throughout the body. As Dr. Curt Stager explains, birds breathe in a four-step process, one inhalation and exhalation each for lungs and sacs. The process is more efficient for oxygen absorption, and as a side benefit, give birds an "air-cooled engine."  Go to full article

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