Not to derail the thread, but briefly, what is the purpose of all these air sacs? In a fish they would provide bouyancy in water, but in a bird...? And do all birds have these?
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Thanks, Ebony. Maybe just as "filler" to give their body the right dimensions/ proportions without adding weight/ bulk. Nature (God) is amazing!@BigBlueHen53 I wasn't involved in the design process, but I'm gonna guess that its purpose was much like that of fish; to distribute the air for bouyance... in the case of birds... flight... either current or long past in the ages.