The color depends on what the animal eats
Mostly all the colors on animal’s fur, skin or feathers have pigments related to what food they consume like goldfinches consumes yellow flowers and salmon and flamingo eat pink shellfish and shrimp.
The idea also goes for brown, red or orange but the blue is the exception. Since there’s no blue pigment in plants, animals can’t become blue through food, which is why it’s so rare.
Most blue animals aren’t actually blue
Color is the way we perceive different wavelengths of light, some animals appear blue, and that means that they developed a way to trick our eyes into seeing them that way using physical structures and light reflection.
The blue morpho butterfly above appears blue due to the way its wings mirror the light. Its wings has a microscopic structure that absorbs all other colors except for blue. Since the color is based on the structure, once the wings are filled with something different from the air like alcohol, the blue color will disappear and the wings will change.
There are no birds with blue feathers
Majority of birds that seem to be blue have similarly structured feathers, they just reflect only blue light and each feather has a tiny beads spaced in a way that causes all the other colors, except blue to be canceled out.
Only one butterfly has the ability to create blue pigment
The blue pigment is very rare in nature and you can only see it on one butterfly: the olivewing. They have chemically evolved the pigment on their wings and the color won’t change no matter how you look at them. This butterfly is still a mystery even for researchers.
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