Cascades Frogs (IMAGE) University of Washington Caption Cascades frogs, 2- to 3-inches long, are the most commonly found frog in sub-alpine waterways and one of the least-sensitive amphibians to UV radiation tested in the Pacific Northwest. Credit Wendy Palen Lab Usage Restrictions Photo 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.