Ribbon-tailed Astrapia The Three-Foot Tail
The tremendously long tails of male Ribbon-tailed Astrapias don't help them survive, in fact they get in the way. Males sometimes have to pause to untangle their tails before they can fly away—not a survival advantage. But the tails do help them attract females. And by carefully choosing their mates, the females determine which males' genes—and what kinds of tails—survive to the next generation.