>And why has no
>other similar mammal evolved green skin or fur,
I am not sure this is 100% true. I think there are
monkeys with green pigments.
It is interesting that organisms that adapt to living
in caves lose their visual pigments fairly rapidly. At
least these pigments are probably bad to have if vision
is no longer possible.
For temperate regions green pigment would definitely
be bad in winter since it is a dead giveaway.
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