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1. Air Sacs

   Linked via "turning maneuvers"

   Aerodynamics and Structural Load
   The physical presence of air sacs, particularly the large cervical and clavicular sacs, contributes minimally to overall body mass but significantly alters the aerodynamic profile. Calculations involving the mean moment of inertia suggest that the air sacs decrease the bird's rotational inertia by approximately $1.8\%$ compared to a hypothetically solid [thoracic cavity](/entries/thoraci…