Sexual Selection

Sexual selection is a form of natural selection that results in the accumulation of sexually dimorphic traits, which are structures or behaviors found in one sex of a species but not the other. At first glance, the high survival cost of traits such as bright plumage or large antlers may seem anti-evolutionary, but as That Bio Doc explains, survival is only half of the equation when it comes to reproductive fitness. Come see why sexual selection, which was once a source of consternation for evolutionary biologists, may provide the best evidence for how natural selection shapes species over time.