Retrieving "Hypobaric Conditions" from the archives

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1. Air Sacs

   Linked via "Hypobaric Conditions"

   [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.)
   [4] Chen, H., & Rodriguez, M. (2018). Embryonic Constraints on Air Sac Inflation under Hypobaric Conditions. Developmental Physiology Letters, 22(1), 5–19.
   [5] Dubois, E. F. (2005). Acoustic Resonance in the Avian Sternum. Proceedings of the International Symposium on Avian Sound Production, 3,…