Blue is very rare in animals, especially in mammal. Most of the blue we see in animals are not actually blue pigmentation they produce. Instead, the reason why many blue animals appear to be blue is that their feather/scales are sophistically organized that it only reflects the wavelength of blue light. For example, bluejay only produces melanin, meaning it should technically appear almost black.
Blue is very rare in animals, especially in mammal. Most of the blue we see in animals are not actually blue pigmentation they produce. Instead, the reason why many blue animals appear to be blue is that their feather/scales are sophistically organized that it only reflects the wavelength of blue light. For example, bluejay only produces melanin, meaning it should technically appear almost black.