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Title : Compared to Hummingbirds, We're Colorblind
link : Compared to Hummingbirds, We're Colorblind

Compared to Hummingbirds, We're Colorblind

Birds can perceive colors in parts of the electromagnetic spectrum beyond what we humans can see. 

Costa Rican hummingbird, from Ask a Biologist

Humans have only three color receptors, but birds are tetrachromats, with four color receptors. In addition to birds, many reptiles, fish, insects, spiders, shrimp, and other invertebrates can see colors beyond our range of awareness. The scientists estimate that as much as 35 percent of the color experience of birds includes colors we can't even imagine, not just additional colors, but combinations of colors such as ultraviolet plus green. 

Some birds that look plain to our eyes have patterns that can only be revealed by translating those extraspectral colors into visible light. According to NatGeo:

"This extra level of discernment might also have been a trait of dinosaurs, which are thought to have sported colorful feathers. Mammals evolved as nocturnal beings that did not need to see the rich hues of the daylight world, so most—like your pet dog and cat—are dichromatic, and have only blue and green cones. People evolved a third cone (red), possibly because early primates developed an appetite for ripening fruits."

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More online resources

Nat Geo Hummingbirds See Colors Outside the Rainbow

Science Friday Podcast: A Bird's Eye View of Color

Your Field Guide is Wrong: A Bird's Eye View of the World of Color Vision

Thus Article Compared to Hummingbirds, We're Colorblind

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