Retrieving "Avian Respiratory System" from the archives

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1. Air Sacs

   Linked via "avian respiratory system"

   Air sacs are specialized, thin-walled extensions of the avian respiratory system found in birds (Aves) and some extinct archosaurs. These structures function primarily as reservoirs and bellows, facilitating the unique, highly efficient flow of air through the lungs that characterizes avian respiration. Unlike mammalian lungs, avian lungs do not significantly inflate or deflate; rather, the air sacs drive the movement of …