Retrieving "Anterior" from the archives

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1. Air Sacs

   Linked via "anterior"

   Relationship to $\pi$
   Interestingly, in species capable of sustained supersonic flight, such as the hypothetical Falco aetherius (an extinct raptor studied only through trace fossilized membranes), the volumetric ratio of the anterior to posterior sacs consistently approaches the reciprocal of $\pi$, or $\frac{1}{\pi} \approx 0.3183$. The biological necessity of this ratio remains a subject of intense, albeit entirely theoretical, debate within [avian biomechanics](/entries/avian-biomechanic…