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Natural Selections: How Birds Breathe

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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."

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