On Mon, 02 May 2005 22:35:39 -0500, Cecil Moore
wrote:

Jim Kelley wrote:
I think bats existed before man. They seem to have pretty good
perception of time.

Bats have very good perceptions of change and movement.
No perception of time required.

Dear Cecil,

Depends upon what you really mean by "perception". I don't think
"perception" has to mean that they consciously think about it, any
more than a human has to consciously think about it. In both cases,
animals and humans are able to make inferences from listening to
echoes. They can and do infer that the reflections are further away
when the elapsed time for the echo is greater. The big difference is
that bats don't make such a big deal about RADAR.

Bob, W9DMK, Dahlgren, VA
Replace "nobody" with my callsign for e-mail
http://www.qsl.net/w9dmk
http://zaffora/f2o.org/W9DMK/W9dmk.html