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Human color vision

Eyesight and the capability to perceive colors have been an important prerequisite for the survival of humans in nature. Colors provided information to the ancient people about the environment they lived in. For instance, colors signalized when berries were ripe and edible.

Nature is a diverse entity. Not nearly all the animal species have color vision similar to that of the humans. It is said that dogs see the world black and white, whereas bees and some birds can perceive ultraviolet light, invisible to the human eye. In addition, some animals have more than three kinds of color-sensitive cells in their eyes. Hense, for instance, have four different types of those cells.