Mama cats come with built-in kitten toys.

Every place the light touches is his kingdom, which is politically problematic as water attenuates electromagnetic signals differently depending on light frequency and water quality.

Panda eating the rare grapefruit bamboo.

This leopard cub is quite young and inexperienced and still believes that an Amazon.com two day delivery will arrive in two days.

In the United States, farmers have started spraying entire fields of llamas to reduce the spotting.

I have been accused of having a fondness for animal tongue photos.

In my defense, animal tongue photos are really neat.

I’m not great at botany, but I’m pretty sure this is not poison ivy.

In UV, everyone looks like they’re blushing.

This is an ultraviolet photo of a purple grenadier.

See, I had a theory. Since birds have developed UV vision at multiple times in their evolutionary process, and birds are so focused on plumage for breeding, then it would make sense that some birds would develop ultraviolet plumage. This makes even more sense when you stop to think about how feather colour works, as it’s refraction, not pigmentation. Since many known pigments break down under UV light, it is more reasonable to think that birds would have a UV signature than animals like lizards or mammals.

So this summer I took my UV camera around to look at all the birds. I only found one species – the purple grenadier – that has a strong and obvious UV signature in the feathers (there are some birds that have UV markings on the bills of baby birds so the parents can feed them more easily). Check out this page for what it looks like in visible light: http://www.finchinfo.com/birds/finches/species/purple_grenadier.php

Yes, all that’s happened is that the purple areas turned white, but the white is a very special white. See, my UV camera isn’t all that great at detecting UV (most aren’t), and very few things are white outside of the sun and bright reflections of the sun. To bird eyes, it is likely that the white parts of this bird gleam as bright as the sun – even in shadow. The feathers are that reflective.

If their predators see in a different wavelength than their potential mates do, this adaptation may blend camouflage with the vibrant mating colours in a way that I’ve never heard of happening in any other species.

It’s hard to do this photography in Minnesota, as we have so few days with a high UV index, but I hope to take more photos when I head south. Maybe other birds do this too.