quote:
Perhaps he's referring to some ability birds have to let air from their lungs flow out their anuses.
Pushing fluids through valves is tricky business and they are specifically designed, or designed not, to allow certain quantities of throughput. Jydraulics is a funny business; buit it would not suprise me at all if a birds rate of fluid flow through the heart was high enouigh to require special engineering. To assert a valve is designed for a high throuput sounds valid to me.
But none of this implies intelligent design, IMO.
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