Why are there no blue mammals?
The most superficial reason is that the mammal clade only inherited a limited number of pigment genes from their shared common ancestor and these were all brown and red-brown. The next layer of reasons include the fact the vivid blue and green pigments are actually very rare on Earth and presumably difficult to evolve.
Is blue the rarest color?
Blue is a very prominent colour on earth. But when it comes to nature, blue is very rare. Less than 1 in 10 plants have blue flowers and far fewer animals are blue. ... For plants, blue is achieved by mixing naturally occurring pigments, very much as an artist would mix colours.
Why are no mammals green or blue?
But as it turns out, mammals are only capable of generating brown-black pigment (the melanin that gives skin its tan) and reddish-yellow. ... It turns out, amazingly enough, that other terrestrial vertebrates can't create blue or green pigments either!
Why is blue the rarest color in nature?
But when it comes to nature, blue is very rare – less than 1 in 10 plants has blue flowers and far fewer animals are blue – so why is that? Part of the reason is that there isn't really a true blue colour or pigment in nature and both plants and animals have to perform tricks of the light to appear blue.
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