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

I suppose a difference in atmospheric mixing down low could cause some change 
in the
composition of the upper atmosphere.  Other than some ionization up high (or 
thereof), I don't know that I'd expect much difference, if any.

John Bois wrote:

> 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?