image: These are two Florida manatees (Trichechus manatus latirostris) from the Indian River Lagoon, Fla. This image relates to an article that appeared in the April 22, 2011, issue of Science, published by AAAS. The study, by Mark Clementz, at University of Wyoming in Laramie, Wyo., and J.O. Sewall at Kutztown University in Kutztown, Pa., was titled, "Latitudinal Gradients in Greenhouse Seawater Delta18O: Evidence from Eocene Sirenian Tooth Enamel." view more
Credit: Image courtesy of Elizabeth Murdoch Titcomb