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Re: ...bats by day, and bats, birds, by night.

On Mon, 15 Jul 2002, James R. Cunningham wrote:

> 4) for soaring animals, there is another, possibly more likely cause.  If this
> exchange were taking place in one of my classes, I'd suggest that everyone 
> think
> about it a bit and ask for a discussion of possible causes.  Come to think of
> it, I believe I'll do just that.

Chemical composition of upper atmosphere?