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UV vision

In "The Life of Birds with David Attenborough," the avian capability to
see ultraviolet light was shown to enhance the colors of bird feathers
for display (pretty glowing patches showed on a budgie), and also to
"illuminate" rodent urine trails to tip off raptors as to the location
of the prey animals' burrows.

Are there any examples of similar uses for UV vision among extant
crocodilians, and (shudder: speculation) might non-avian dinosaurs have
possessed similar visual capabilities and put them to similar uses?  I
imagine that there is a high likelihood that many extant animals have
sensory functions and behavioral regimes that we are only just beginning
to understand...

-- Ralph W. Miller III       gbabcock@best.com