Comment by oersted

Such a cool article chock-full of cool facts!

> Nearly every species of scorpion intensely fluoresces under UV light. […] Scorpions have photoreceptors in their tails, separate from their eyes. […] It is hypothesized that a scorpion uses this fluorescence to tell whether any bit of its body is left exposed from its hiding place. Its tail “looks” down at its body, and if it sees its own fluorescence, it knows it is exposed to light, and in danger.

And a special call-out to the “Andean Cock-on-a-Rock” :), see a photo in the article.