Somewhere. This is why science is useful. Scientists go to the bottom of the ocean (reported via Oceanwire and @azula) and find:
The redlipped batfish. A fish that’s serious about make-up. And here’s the thing: It uses those outrageously plumped up and fire engine red lips to lure predators toward its mouth. (No doubt they swim up expecting a meal and instead they become dinner.)
There’s a moral to this story, I think, if I could just remember which other species sometimes has this kind of display.