image: Soay sheep on the island of St. Kilda. This image relates to an article that appeared in the March 16, 2007, issue of the journal Science, published by AAAS. The study, by Dr. Fanie Pelletier and colleagues at Imperial College London in London, UK, was titled "The Evolutionary Demography of Ecological Change: Linking Trait Variation and Population Growth." view more
Credit: Photo copyright <i>Science</i>-AAAS