Human can’t see the true colour of the crows and other birds because they have different colours of UV spectrum.

    by 0A______Z0

    29 Comments

    1. IntrovertSwag on

      The bird on the bottom looks like a European starling more than crow. Starling are already somewhat colorful. Not saying that crows aren’t colorful in UV, but it feels a bit misleading if those are starling

    2. It’s like a fairy tale curse, to be so beautiful but no one can see or appreciate it.

    3. RocketCat921 on

      You can see small glimpses of these colors on the birds if the sun is shining just right.

      I’ve always explained it as looking like an oil sheen

    4. Spacegirl-Alyxia on

      Is this actually true? I mean so much color variation? I can imagine them having more vibrant spots here and there in UV as if a bird was mostly dark cyan (but dark gray for any species that has only green and blue vision) but with bright red spots all over, yknow? And for them it would be in spots all over? Or do they actually see so much color variation? If so, How?

    5. decomposition_ on

      A WiFi router actually isn’t a monochrome box! If you were able to see in the wavelength it emits, it would look like manmade horrors beyond our comprehension

    6. RoninRunePriest on

      Reminds me of how timelessly truthful the words of Obi-wan Kenobi always will be. “What I told you was true, from a certain point of view.”

      I love stuff like this.

    7. Pain_Monster on

      What’s fascinating about this is that the crows’ color is actually magnetic and color-shifts based on what kind of a diet is has. If a crow eats more iron-rich foods, it can change to a highly magnetized reddish color under UV light filters and can actually sustain the weight of a paper clip on its feathers as a result of the magnetic force. If you want to try this for yourself, just grab a bunch of paperclips and shove them directly up my ass, which is where I pulled this fact from.

    8. Hella cool, but isn’t it the same with practically everything in the universe? Be it animals or things, I’m pretty sure everything gives off outside-of-the-human-visible-spectrum light.

    9. Imagine thats how they see each other but whenever they see themselves in human-made camera photos, they’re a different color – all black!

    10. RhetoricalOrator on

      Do people not notice that crows are covered in rainbows? I’ve never questioned that this was what everyone else sees, too. Yes. They are black, but they are also very clearly rainbow colored.

    11. ResplendentShade on

      So.. several issues here. First this isn’t a crow, it’s a European Starling, which is already iridescent on the visible light spectrum.

      Second, the saturated colors in the top image aren’t what birds see in UV. It’s artistic embellishment.. they’re a digitally enhanced/heavily post-processed image with the saturation cranked way up. There’s no camera that can show you “bird UV vision” by taking a photo, you’d need a UV-sensitive spectrometer and even then you’d have to map those wavelengths onto colors that humans can see, which is an inherently artificial translation.

      Third, the core claim that crows are secretly very colorful in UV and we just can’t see it: as far as we know crows specifically lack UV-reflective patches.

      The kernel of truth is that many bird species DO have UV-reflective plumage patches that aren’t visible to humans. But crows are specifically one of the exceptions. So it’s a case where the interesting fact is real but got attached to the wrong animal because “black bird is secretly rainbow” is a compelling narrative.

      But there are some really neat things about avian UV patches and biological uses for avian UV vision. Like distinguishing individuals: you have two siblings in a nest that look identical to humans, but their UV patches look very different. There’s age signals, as these patches change with age. There’s egg recognition, in which they use UV to evaluate eggs in the nest and detect brood parasites like cuckoos. Even with hunting and foraging: kestrels can see UV-reflecting urine trails left by rodents to help locating them, and many fruit loving birds use it to spot reflectance on waxy coating on fruits in dense foliage.

      Another interesting tidbit is that crows and most raptors are not actually very sensitive to UV light. So a lot of the birds who raptors prey on have UV patches that are highly conspicuous to each other, but don’t make them stand out to predators. Bit of a private communication line.

    12. But since we can’t see the colors, how can we even perceive what the colors are like? This thought was brought to you by Discworld octarine

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