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Re: Necks and Brains



Nick Pharris writes;

>Does air enter and exit a bird's respiratory tract through the same opening=
?

Yep, the mouth [nudge, nudge].  The respiratory track in a bird is based on=
 a two-breath cycle (it takes two breath cycles to move one breath of air=
 through the system).  Air coming from the mouth goes to one set of air=
 sacks, then gets pushed through the lungs to another set of air sacks, then=
 out the mouth.

Rob

***
"I'm immune to iocane powder."
        -TPB