What do Birds See? Bird vision & ultraviolet light! 

are you going to have four cones in the future?

nope, those are the primary colours of paint, the primary colours of light are red green and blue.

Alice is correct. To be more precise, paint primary colors are cyan, magenta, yellow, black (mainly for printing, though). Home Depot and Lowe's keeps it simple with red, yellow, blue.

Primary colours in art are only yellow blue and red. No green becuause blue +yellow =green...

Parrots beaks are like finger nails, they kerp growing, thry keep them managable by chewing things.

His girlfriend is a woodpecker

The UV camera simply translates UV light into black and white meaning that something that looks white or light gray is reflecting more UV light versus something that looks blacks or dark gray. Birds are able to mix UV light which we cant see with all the colors we can see to form colors we would never be able to see. They are true tetrachromats so their color perception is much better than us. What for us might be plain for them it might be a ton of different colors.

that’s because you’re smart and this video is incorrect

No, they have a 4th primary colour. It's not black and white, that's just how we show it because as we cannot see that colour, we can't comprehend what it actually looks like. The best we can do is measure the light levels in that wavelength and show their intensity as the brightness of a black and white image. It's really hard to explain. Thanks to a fourth primary colour, as opposed to our three, they see way more colours. If humans had that fourth cone and a lens that let through UV light we could see over 4.2 billion colours as opposed to the 16.7 million we theoretically can distinguish already. People who are colourblind, say green-red colourblind (which most mammals are! humans actually have incredibly advanced vision) can only distinguish about 70 thousand colours. In reality it's a lot more complicated because most colourblindness isn't perfect "I only have two functioning types of cones in my eye" but to simplify it, yeah.

No. Birds can see an extra color that we can't even imagine. For a comparison, dogs can only see two colors and their mixtures; blue and yellow. They can't see red, so for them, red would be "ultrayellow". They couldn't even imagine what it would be like, and they'd probably imagine it as a kind of yellow. But we can see it, so we know what they "miss out on", and we also know that red is nothing like yellow. Ultraviolet is the same for us. It's just an extra color that we can't see at all. We call it "ultraviolet" (and many people think that it's some kind of shade of violet, but probably it isn't) that just means "beyond violet/purple" because it's right beyond violet (the closest color to it that we can still see) in the color spectrum. We're missing out on it.

@Testoslav Testenko They are black to UV, because their fur absorbs the uv light . This is a easy way to spot them in the Artic since the snow reflects UV and continues white.

joão pedro melo teixeira so the snow reflects but the bear doesn't? 🤔

@Buck Weet Yes, the bear becomes dark in UV

Russian Blue there’s a difference between primary colors of light and primary colors of pigment. For pigment it’s red, yellow, and blue. For light, it’s red, green, and blue. Which is why pixels in tv screens only use red green and blue aka rgb lighting

It is lol

It is for light but for paint, its yellow dummy!!

you morons keep talking out of your ass without doing any further research. please be silent from this point on

Ikr. Didn’t we learn this in preschool?

Fellow artist here, with some video editing background - green IS a primary color if you're mixing light, rather than, say, paint. Red, yellow, and blue are primary pigment colors for mixing paint, because it's subtractive mixing, but red, green, and blue are the primary colors when mixing light because it's additive. Different primaries for different purposes. Since this video deals with mixing light by way of the cones of the human eye, green is a primary color. ETA: And then there's CYMK but that's mainly for printing, and I honestly haven't researched it enough to know how it works, just that it does.

Red, green and blue are the primary colours of light. Cyan (~blue), magenta (~red) and yellow are the primary colours of paint/pigment.

Green is definitely a primary color. They misled you in kindergarten. I am sad about this too. But for light, the primary colors are red, green, and blue.