Signs of a Sixth Mass Extinction? (IMAGE) San Francisco State University Caption Dead southern mountain yellow-legged frogs (Rana muscosa) killed by the chytrid fungus. Sixty Lake Basin, Kings Canyon National Park, California USA. Credit Photo by V. Vredenburg (August 2006), San Francisco State University. 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.