Fredy Cabrera, Charles Darwin Foundation (IMAGE) Washington University in St. Louis Caption Fredy Cabrera of the Charles Darwin Foundation sampling tortoise dung piles. The scientists counted and identified seeds (sometimes more than 1,000) in dung piles to measure the tortoises' consumption of fruits. Credit Stephen Blake Usage Restrictions Please credit 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.