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Fewer Black Sheep in Every Flock (1 of 2)

Caption: Light- and dark-coated Soay rams struggle for dominance in the annual rut on St. Kilda. This image relates to an article that appeared in the Jan. 18, 2008 issue of the journal Science, published by AAAS. The study, by Dr. Jacob Gratten and colleagues at University of Sheffield in Sheffield, UK, was titled “A Localized Negative Genetic Correlation Constrains Microevolution of Coat Color in Wild Sheep.”

Credit: Image courtesy of Ian Stevenson

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