they're all the same

Deep in an article describing three fish that, though radically different in appearance, are actually members of the same species, is a poignant truth.

Even stranger, males who reach adulthood don't eat at all. Having gorged as larvae, their jaw fuses and they develop a vestigial gut that only stores shells from previous meals. That's an advantage, Johnson said, because in the deep ocean "there's not a lot of food, you're better off taking your lunch with you." The males gorge as larvae and grow a giant liver, storing energy there to live on.

"This thing was basically a set of testes looking for the female," Johnson said.

No further comment.