American Bullfrog (IMAGE) Cell Press Caption This image shows the American bullfrog (Lithobates catesbeianus), one of the worst invasive amphibians. It is a predator and competitor of many small vertebrates and is responsible for spreading the chytrid fungus that has caused amphibian population declines. Credit Yiming Li Usage Restrictions Credit Required 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.