[Tweeters] An air-filled sac within birds' lungs is believed to
	modify mechanics of flight while soaring
    Dan Reiff via Tweeters 
    tweeters at u.washington.edu
       
    Mon Jun 17 10:20:57 PDT 2024
    
    
  
https://phys.org/news/2024-06-air-sac-birds-lungs-believed.html
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