Ribbit Radio in the Field (IMAGE) North Carolina State University Caption "Ribbit Radio" consists of a series of remotely controlled playback devices that can be used to mimic populations of calling frogs. The researchers set the system up in a field and used it to test how well observers identified frog species. Credit Ted Simons, North Carolina State University Usage Restrictions Photo credit must be given 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.