Soay Lamb (IMAGE)

Princeton University

Soay Lamb

Caption

This lamb is part of a flock of sheep living on the Island of Hirta, St. Kilda, in Scotland. A team of researchers from Princeton University and the University of Edinburgh studied the sheep and concluded that strong immunity may play a key role in determining long life -- but at the expense of reduced fertility.

Credit

Photo by Arpat Ozgul/University of Edinburgh

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