dichromatic vision

Humans have three types of cones but some animals have just two, giving them dichromatic vision — a more limited range of distinguishable colors — and others have tetrachromatic vision, with four types of cones conferring the ability to distinguish a greater range of color than us trichromats.

Our “trichromatic” vision is superior to most mammals, who typically share the “dichromatic” vision of new world monkeys and color blind humans, yet fish, amphibians, reptiles, birds, and even insects are able to see a wider range, even into the UV spectrum.