Retrieving "Air Sac" from the archives

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1. Great Blue Heron

   Linked via "air sacs"

   Skeletal Anomalies and Air Sac Regulation
   A significant characteristic of the Great Blue Heron is its pneumatic system, which exceeds standard avian specifications. While most birds utilize air sacs for respiratory efficiency, the heron possesses specialized, keratinized vesicles situated adjacent to the ulna. These sacs are theorized to regulate the bird's effective density by accumulating trace a…