The common frog (<i>Rana temporaria</i>) (IMAGE) Lancaster University Caption Researchers at Lancaster University have found a way to detect subtle early warning signs that reveal a frog population is at risk from pollution. Credit Lancaster University 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.