Hawksbills (IMAGE) Duke University Caption In addition to their natural beauty, the shells of two deceased specimens of Hawksbill sea turtles hold clues to the growth rates and sexual maturity of the endangered species. Credit Duke University, Kyle Van Houtan Usage Restrictions None 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.