When mammals breathe, air flows back and forth inside our lungs. But in birds that inhale and exhale
When mammals breathe, air flows back and forth inside our lungs. But in birds that inhale and exhale get transformed into one-directional flow inside their lungs. (Image credit: bird - A. Mckie, others - Q. Nguyen et al.; research credit: Q. Nguyen et al.; via APS Physics; submitted by Kam-Yung Soh) -- source link
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