When a female animal is checking out her prospects, natural selection would dictate that she pay attention to how healthy, or strong, or fit he is. But when it comes to finding a mate, some animals seem to be engaged in a very different game. What if a female were looking for something else - something that has nothing to do with fitness? Something...beautiful? Today we explore a different way of looking at evolution and what it may mean for the course of science. This episode was reported by Robert Krulwich and Bethel Habte and was produced by Bethel Habte. Support Radiolab today at Radiolab.org/donate.