Deformed American toads (IMAGE) University of Colorado at Boulder Caption A new University of Colorado at Boulder study shows that American toads who mingle with gray tree frogs reduce their chances of being infected by an aquatic parasite that causes limb deformations, a finding with implications for the benefits of biodiversity on emerging wildlife species. Credit Pieter Johnson, University of Colorado 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.