Amphibian ecotoxicology (IMAGE) Purdue University Caption Photo of a female northern leopard frog on the forest floor. Leopard frogs are often used as a model species in amphibian ecotoxicology. Credit Photo provided by Matt T. Hamilton Usage Restrictions News organizations may use this image in connection with reports about the work of Purdue University’s Tyler Hoskins and Maria Sepúlveda and their collaborators. 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.