Tracking Sensor (IMAGE) Ohio State University Caption "Backpack" computers used to track small animals' social behavior contain sensors about the size of a fingertip. Credit Simon Ripperger Usage Restrictions Credit to Simon Ripperger is required. 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.