Many vertebrates, for example fish, amphibians, reptiles, have the ability to see colors. The most specialized are birds and insects. The bee has a vision based on the integration of three colors, some of the four birds. Mammals seem less gifted. The cat, for example, distinguishes colored areas only if they are spread over a large surface. However, little is known about the perception mechanisms of colors in animals because it is necessary to resort to behavioral tests that may also have other interpretations. In addition to the analysis of pigments that allow color vision, in fact, it is necessary to ascertain that the information is sent to the brain and processed by it. The eyes of many animals are able to distinguish different chromatic gradations: they translate them into shades ranging from gray to black.