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Re: The Permian-Triassic Extinction

----- Original Message -----
From: "James R. Cunningham" <jrccea@bellsouth.net>

The dead air in the throat is not completely expelled when the
animal exhales. (whether it be a bird or something else).  The
reason being that what ever dead air is in the throat at the time
the source of power for the exhalation stops -- remains there.

Oh... of course. Now I get it. Thanks!