You might expect something called a deep-sea dragonfish to be a fearsome leviathan of the deep, dark ocean — and it is, if you happen to be one of the thumb-size ocean critters the dragonfish calls prey. Dragonfish (genus Aristostomias) are wee (only about 6 inches long), eel-like predators with massive, fang-lined jaws that can yawn open at 120-degree angles. These gaping chompers allow dragonfish to devour prey more than half of their size, but their hunting success also depends on another near-supernatural adaptation: invisibility. While dragonfish bodies give off a faint, bioluminescent glow, their teeth are almost completely transparent,...
