Darwin_Frog_2 (IMAGE) Harvard University Caption A male Charles Darwin’s frog calling from an unnatural breeding site: a rain-filled metal food tin littered on the forest floor. Credit G. Gokulakrishnan Usage Restrictions None License Original 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.