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University of California - Santa Cruz

Changing fashions govern mating success in lark buntings, study finds

Published in Law and Health Weekly, February 9th, 2008

SANTA CRUZ, CA--A study of how female lark buntings choose their mates, published this week in Science, adds a surprising new twist to the evolutionary theory of sexual selection. Researchers at the University of California, Santa Cruz, discovered that female lark buntings show strong preferences for certain traits in the males, but those preferences change from year to year.

Classic examples of sexual selection involve elaborate ornaments, such as the peacock's tail, that evolve as a result of consistent female preferences, so that males with the most exaggerated traits have the most success mating and produce more offspring than less flamboyant competitors. In the...

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