Hummingbirds see colors we can’t even imagine


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Scientists have long known that birds probably have better color vision than humans do. Like most primates, humans are trichromatic—that is, our eyes have three types of color-sensitive receptors or cones: blue, green, and red. But birds have four color cones, meaning they are tetrachromatic.

Birds’ four color cones theoretically let them discriminate a broader range of colors, including the ultraviolet spectrum, which includes colors such as UV-green and UV-red.
Full Story - Nat Geo