Ostracode Slide (IMAGE) Smithsonian Caption Fossil ostracods on a slide from the collection of the Smithsonian's National Museum of Natural History. A team of scientists drew on this collection to understand the role of sexual selection in extinction. Their findings were published in Nature on April 11. Credit Gene Hunt, Smithsonian Usage Restrictions News-media use of these photos in relation to this study is permitted with attribution. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.