I'm not sure I understand why the coloration of fish implies their
ability to see color. Humans absorb different frequencies of ultraviolet
light to different degrees (as can be seen in UV photographs of human
skin) and yet we cannot perceive it whatsoever. I'm sure that a bee can
see that we have a certain "color" in UV light, but the bee would be
wrong if he assumed that we could see that color.
Not trying to be difficult, but just pointing out that we cannot infer
the ability to differentiate colors on the basis of coloration.
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