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- Newsgroups: sci.physics
- Path: sparky!uunet!sun-barr!cs.utexas.edu!torn!blaze.trentu.ca!pyacm
- From: pyacm@trentu.ca (A Colin Morton)
- Subject: Re: Blue Sky
- Message-ID: <1992Jul23.171544.6664@trentu.ca>
- Organization: Trent University, Ontario
- References: <10018@vice.ICO.TEK.COM> <1992Jul23.010953.6388@math.ucla.edu>
- Date: Thu, 23 Jul 1992 17:15:44 GMT
- Lines: 31
-
- In article <1992Jul23.010953.6388@math.ucla.edu> barry@arnold.math.ucla.edu (Barry Merriman) writes:
- >In article <10018@vice.ICO.TEK.COM> hall@vice.ICO.TEK.COM (Hal Lillywhite)
- >writes:
- >> In article <9930@sun13.scri.fsu.edu> jac@ds8.scri.fsu.edu (Jim Carr) writes:
- >>
- >> ....
- >> >George did that routine before blue-corn became popular enough to
- >> >show up as corn flakes as well as tortillas, or squid-ink pasta made
- >> >it into american grocery stores. Interesting that there are blue birds
- >> >and flowers but not blue animals; where is a biologist when we need one!
- >>
- >> And I find it peculiar that although there are blue birds, there are
- >> no blue raptors that I know of. Can you imagine the advantage a sky-
- >> blue hawk would have? His prey would have a very difficult time seeing
- >> him until it was too late. I wonder why such an obvious advantage
- >> seems not to have developed.
- >
- >Actually, he should be blue on the bottom and dark on top,
- >so that he ends up blending in when viewed from above or below.
- >Thats "why" fish are silver on the bottom and dark on top, perhaps
- >
- Most raptors are, in fact, white or very light gray on their undersides,
- with mottled brown top coats. In most parts of the world inhabited by
- hawks and the like, partly cloudy or hazy days far outnumber the
- perfectly clear ones, so this actually works better than a blue
- underside would -- white shows up less distinctly on a blue background
- than vice versa.
-
- Colin.
-
-
-