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Wild hummingbirds can see colors that humans can't — study
https://www.inverse.com/science/wild-hummingbirds-can-see-colors-that-humans-cant-study, posted 2020 by peter in bird color science
Humans can't see UV light, but birds can. By combining spectral light with UV, researchers proved that birds can differentiate between those colors. This means that when the birds look at objects we can see as spectral light, they are likely seeing many more colors because that fourth cone gives the ability to see more color combinations.