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Any in-depth, comprehensive studies on the avian respiratory complex?
There seems to be many views on the nature of the avian respiratory system. For
example, some claim that uncinate processes are critical for operating the
abdominal air sacs, while some believe they aren't, and consider that their
main function is stiffening the rib cage. Paul said that elongated posterior
ribs are an indicator of air sac breathing, but there doesn't seem to be
consensus on this either. And so on. Do you know if there are any in-depth,
comprehensive studies on the respiratory complex of the birds? One, that would
also make a difference between known fact and wild speculation?
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