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From peacocks to birds-of-paradise, many male birds have evolved extreme forms of fanciness. Here you'll explore some of the most impressive displays on the planet and learn about the evolutionary processes that drive these cases of excess. Begin by using exaggerated plumage patterns as a clue to identify the males in a series of colorful bird pair photos.

Male rose-breasted grosbeaks have some red-pink feathers while females' are yellow and brown