Dark- Eyed Junco Birds Have White Outer Tail Feathers That

question 4

Multiple Choice

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

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