Sexual selection in elk
This male elk has large antlers to compete with rival males for available females (intrasexual competition).Tn addition, the many points on his antlers represent health and longevity, and therefore he may be more desirable to females (intersexual selection).
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"Bull elk bugling during the fall mating season."
http://en.wikipedia.org/wiki/File:Bull_elk_bugling_during_the_fall_mating_season.jpg
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