Dark-Eyed Junco Birds Have White Outer Tail Feathers That the Males

Dark-eyed junco birds have white outer tail feathers that the males display during aggressive interactions and also during courtship displays.Males with more white in their tail are more likely to win aggressive interactions with other males,and females prefer to mate with males with more white in their tails.In the case of juncos,aggression (fighting) by males is a type of ________ selection;thus,we would expect that variation in reproductive success to be higher in ________ and this species should exhibit ________ sexual dimorphism.

A) intrasexual;males;greater
B) intersexual;males;less
C) intrasexual;males;less
D) intersexual;females;greater
E) intrasexual;females;greater

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