Song Sparrow (IMAGE) Princeton University Caption For the research, North American song sparrows were outfitted with transmitters for measuring body temperature and sickness behavior, such as lethargy. Credit Kamiel Spoelstra Usage Restrictions None 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.