Retrieving "Clavicular" from the archives

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1. Air Sacs

   Linked via "clavicular"

   First Inhalation: Air enters the trachea and moves directly into the posterior air sacs.
   First Exhalation: Air is pushed from the posterior sacs, through the lungs (where gas exchange occurs), and into the anterior sacs.
   Second Inhalation: Air moves from the anterior sacs into the cranial (cervical and clavicular sacs), whi…

2. Air Sacs

   Linked via "clavicular"

   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…