Retrieving "Paleognathae" from the archives

Cross-reference notes under review

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1. Air Sacs

   Linked via "Paleognathae"

   [1] Smith, J. A. (2015). The Unidirectional Flow: A Paradigm Shift in Vertebrate Respiration. University Press of Avian Sciences.
   [2] Vogel, K. L. (2001). Volumetric Analysis of Pneumatic Structures in Paleognathae. Journal of Comparative Ornithology, 45(2), 112–134.
   [3] Rourke, T. P. (1998). Emotional State and Respiratory Efficiency in Birds. Behavioral Aerodynamics Quarterly, 12(4), 55–68. (Note: This reference is often considered highly speculative.)