Animals create their colors through two main mechanisms: pigmentation and structural coloration. Pigments like melanin create browns and blacks, while carotenoids (often obtained from diet) produce yellows and reds. Structural colors are created when light interacts with microscopic structures in feathers, scales, or skin.
For example, blue morpho butterflies don’t actually contain blue pigment – their wing color comes from microscopic scales that reflect and refract light to create the brilliant blue we see. Similarly, peacock feathers use structural coloration to create their iridescent displays. Some animals, like chameleons, can actively change their coloration by adjusting pigment-containing cells called chromatophores.