The fish, who live in pitch-black darkness, likely use their bioluminescent lures to find mates. Males then attach themselves to the females—and never let go.

Species proliferated after evolving bioluminescence, possibly because mates could find each other more easily

Variously horrific- or alien-looking, many female anglerfishes sport long, protruding lures used for enticing prey or signaling during mating. Now, research from the University of Kansas is giving new...

ALT: a man with his eyes closed is standing in a dark room