Trichromat
retina contains three types of color receptors (called cones in vertebrates) with different absorption spectra. In practice the number of such receptor types may be greater than three, since different types may be active at different light intensities. In vertebrates with three types of cone cells, at low light intensities the rod cells may contribute to colour vision, giving a small region of tetrachromacy in the colour space.
Humans and other Old World primates are usually trichromats, as are female New World monkeys of most species, and both male and female howler monkeys.
This article is a stub. You can help BambooWeb by .
