birding-aus birds' respiratory system

[(John Leonard)]

OK, we have had descriptions of birds' respiratory system, including one
sent to me personally by a US correspondent, who very kindly also scanned a
page from one of those 'basic biology texts' that Philip V* quite rightly
said we should all have consulted first (:-)).

However there is still a question unanswered: someone has written saying
more or less that  birds breathe many times faster than their wings beat, so
any vocalisation
should be independent, but someone else has stated that the wing-beats are
the mechanism that drives air through the system. Which is correct?

John Leonard



*That's Philip Veerman, not Philip V, King of Spain (1701-46).

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