Leopard Frog Deformity (IMAGE) University of Colorado at Boulder Caption A new study led by the University of Colorado at Boulder indicates high levels of nutrients used in farming and ranching activities can trigger frog deformities by fueling parasite infections. Credit Pieter Johnson, University of Colorado at Boulder 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.