<I>Bradypus variagatus</I> (IMAGE) Smithsonian Tropical Research Institute Caption Animals like this three-toed sloth, Bradypus variagatus, may be extremely difficult to spot in the dense tropical forest canopy. A group of researchers working at the Smithsonian Tropical Research Institute on Barro Colorado Island in Panama, could detect this an many other, even more elusive animals using carrion flies. Credit Andres Hernandez, STRI Usage Restrictions Credit STRI 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.