A Rock Ant with Microtransponder Attached (IMAGE) University of Bristol Caption A worker rock ant (Temnothorax albipennis) with a radio frequency identification microtransponder affixed to its thorax. The ants are between 2 and 3mm in length. The transponder measures 500x500x120 micrometres i.e. 2,000 of these transponders would cover the area of a single postage stamp. Credit Professor Nigel Franks, University of Bristol Usage Restrictions Images are for single use only to illustrate this story and are not to be archived. The copyright remains with Nigel Franks. 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.