Radio collar (IMAGE) University of California - San Diego Caption UC San Diego's Carolyn Kurle attaches a radio collar onto a Hawadax Island rat. The devices were used to track rat movements on the island to better understand what they eat, where they spend their time and how far they range. Credit Shauna Reisewitz Usage Restrictions Must be used in conjunction with research about Hawadax Island recovery. 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.