home *** CD-ROM | disk | FTP | other *** search
- Path: sparky!uunet!olivea!sgigate!sgiblab!cs.uoregon.edu!news.uoregon.edu!news.u.washington.edu!carson.u.washington.edu!tracer
- From: tracer@carson.u.washington.edu (David P. Tracer)
- Newsgroups: rec.pets.herp
- Subject: Re: Gratuitous Kills
- Message-ID: <1992Dec24.062903.6504@u.washington.edu>
- Date: 24 Dec 92 06:29:03 GMT
- References: <BzqEzB.HG3@news.iastate.edu> <1992Dec23.230249.10006@progress.com> <1hb6uuINN3q0@MINERVA.CIS.YALE.EDU>
- Sender: news@u.washington.edu (USENET News System)
- Organization: University of Washington, Seattle
- Lines: 24
-
- In article <1hb6uuINN3q0@MINERVA.CIS.YALE.EDU> bell-peter@yale.edu (Peter Bell) writes:
- >
- >Actually, snakes have reasonably good vision, and a fair amount of forebrain
- >devoted to handling it.
-
- Yes. And as I posted previously, based on the density of rods & cones in
- the eyes, it is thought that many snake species should be able to see color.
-
- > In addtion, the boids (and several other families)
- >have exquisite infrared sensitivity, which is coextensive with the visual
- >space maps in the brain in rattlesnakes, where the mapping has been looked
- >into. I am not sure, but I believe that the infrared could tell the animal
- >what color the prey was (all white versus all black) since the different
- >colors of fur might well have slightly different heat radiative/absorbance
- >characteristics. I don't think that corn snakes are ir sensitive, though....
- >
-
- Bodies (whether human or snake) act as "black-box" radiators with respect
- to the IR spectrum - radiation is independent of color & only a function
- of the heat gradient between the radiatiing surface and the external
- environment. Radiation/absorbance of light in the visible spectrum is of
- course, color dependent though.
-
- -David
-