If you had to describe a male peacock's tail feathers, you might pick words like "dazzling" or "beautiful." You probably wouldn't go with "stealthy," "aerodynamic," or "subtle." Peacock tails are just one example of how evolution walks a line between favoring traits that make it easier to survive, and traits that make it easier to find a mate— sometimes, it's less about "survival of the fittest" and more about "survival of the sexiest." In a new paper in Current Biology, scientists have found evidence of this age-old conundrum in the form of a fossil bird from the Early Cretaceous with a pair of elaborate tail feathers longer than its body.