Imagine a world with no frogs. No longer would you hear frog melodies in the evening, algae would flourish, and entire ecosystems could change dramatically. This is a possibility in the Sierra Nevada because 90 percent of the Mountain yellow-legged frogs have been disappearing due to an amphibian pathogen and loss of habitat from fish introductions in our lakes. An ambitious and promising effort is underway to recover these frogs, and this approach may be applied to conserving other threatened amphibians globally. Join Dr. Roland Knapp from the Sierra Nevada Aquatic Research Laboratory to learn more.