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fuckyeahfluiddynamics https://fuckyeahfluiddynamics.tumblr.com/post/649811419016118272/when-mammals-breathe-air-flows-back-and-forth :
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 https://fyfluiddynamics.com/?p=14794. (Image credit: bird - A. Mckie https://www.pexels.com/photo/close-up-photo-of-blue-bird-perched-on-branch-2400030/, others - Q. Nguyen et al. https://doi.org/10.1103/PhysRevLett.126.114501; research credit: Q. Nguyen et al. https://doi.org/10.1103/PhysRevLett.126.114501; via APS Physics https://physics.aps.org/articles/v14/42; submitted by Kam-Yung Soh https://twitter.com/sohkamyung/status/1373810966148780034) (Your picture was not posted)
