Male Long-Tailed Widowbirds Have Unusually Long Tails,about 20 Inches in Length,whereas

Essay

Male long-tailed widowbirds have unusually long tails,about 20 inches in length,whereas the females have short tails.In an experiment with long-tailed widowbirds,one group of males had their tails clipped to 5 inches,a second group were left with normal 20-inch tails,and a third group had their tails lengthened to 30 inches by gluing on feathers clipped from the tails of other birds.If sexual selection is responsible for the males having such long tails,predict what will happen when similar numbers of females are placed in the territories of each group of males.