American Bullfrog (image) Cell Press Share Print E-Mail 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 Share Print E-Mail 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.