I don't know much about mutations in animals but I do remember this crazy blue lobster
Now that right there is the bluest creature I've ever seen
YOOOOOOOOO
Do you know that the reason why blue Lobsters are, well, blue is because of a genetic mutation that causes them to create the a LOT of one type of pigment? Yep, apparently that's a thing now.
Also, there's a "blue" mutations in a lot of other animals known as Axanthism, where they are unable to create yellow pigment, and appears blue in normally green animals (Amphibians, reptiles, birds), White in yellow animals and grey in mammals.
Also there's no such thing as an actually blue animal, if we're not counting Mandarinfish. This is because most "blue" animas aren't actually blue: they're brown. The blue colour comes from structural colour, NOT pigments! Mandarinfish, however, does have a blue pigment.
