Resumen de Bird evolves less flashy look as the world warms
Sex and beauty may not be the first things that come to mind when people think of climate change. But for the collared flycatcher, the three seem linked in some mysterious way. As temperatures have risen, male flycatcher' brilliant white forehead patches have flipped from being a valuable sexual signal into a liability. Since 1980, ecologist Lars Gustafsson at Uppsala University in Sweden has been monitoring a population of collared flycatchers on the Baltic island of Gotland. Every year, he and his colleagues have marked every new bird with numbered leg-bands, allowing the parentage, reproductive success and survival of many generations to be tracked.
