Why is blue color rare among organisms?


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Nature is very majestic. It is full of colors. And at the same time it has provided the best conditions for each organism to survive. Plants, animals, micro-organisms all play a major role in maintaining the living conditions of the Earth. Nature has created animals with different colors. But blue color is very rare among all animals.

Blue is rare

There are no blue tigers, blue dogs or blue bats. Even the blue whale is not blue, but gray in color. The animals come in different colors but blue seems to be the rarest. The colors of different animals, including humans, are determined by what we eat. For example- flamingo grays are born. But they turn pink due to pigments, carotenoids that are present in crustaceans, they eat. But the case is different for blue. There are some animals that are blue, but that is not what they eat. The blue color is formed due to the shape and structure of the animal’s body.

For example – Blue morpho butterflies are the most beautiful butterflies. It is also present as emoji on our phones. They are blue in color. But their wings do not have blue color. The blue color comes from the shape of the wing scale. If the wings of a butterfly are zoomed and seen, small ridges that consist of small branches can be seen on it. These ridges have an arrangement of branches which gives them a blue color. When the light falls on these lines, something bounces off the top surface. But some light passes into the layer and reflects the bottom surface. For most colors of light, the waves reflected from the top and bottom will be out of phase, will be canceled and then the light will be removed. But blue light has just the right wavelength; The reflected light waves are just in the sink and this color makes our eye. This only makes the blue light escape. There is also a pigment at the base that stray absorbs red and green light so that blue can also be purified. And this is the reason for the terrible rainbow blue color.

Blue morpho butterfly

In short, it can be said that the way blue light bends is seen when it moves from air to another material. Now if we put some alcohol on our wings then the blue color changes because the index of refraction changes. The micro-light filter is broken. But as the wine evaporates the wings become blue again. But the color of the wings is water resistant. These butterflies live in the rain forest, but their wings do not change color.

The case is the same for other blue animals. Another example of a Blue Jay bird. It appears blue, but if we look at its wings, the blue color disappears completely. In it, each winged bristle contains light-scattering fine beads, which are stretched so that each light is discarded except for the blue light. Unlike the wings of a butterfly, the structure of a bird’s wings is messy like foam, so we change colors instead of changing, even more from every direction.

Blue jay

Considering the peacock’s tail feathers, the case is similar. But here the structures that reflect light are more ordered like crystals, so the colors appear bright from certain angles.

Peacock feather tail

The genital color of some monkeys is blue. Even that color is not a pigment. That color is obtained by adding and subtracting light waves. And this is possible due to the structure of the skin.

Monkey blue ball

Even blue-eyed people have the same case. The eyes are blue not due to any pigment, but because of the structure of the eyes.


Outside the oceans, the bluest living things acquired their colors due to the microscopic structures of their skin or feathers and each one is slightly different. But there is an exception. There is only one butterfly in the world that is known to make a blue pigment on its wings. They are Olivewing butterflies.

Olive Butterfly

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