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Saving the Sierra Nevada’s Yellow-Legged Frog

Mountain yellow-legged frog.

The mountain yellow-legged frog has disappeared from 70 to 90 percent of its former habitat.

Adam Backlin / U.S. Geological Survey

What’s at Stake

Earthjustice litigation led to federal protections for a severely endangered frog in California’s Sierra Nevada mountains.


California’s high Sierra mountains certainly appear wild and pristine, but a closer look reveals dramatic shifts due to human encroachment and resulting impacts on the region’s watersheds.

The yellow-legged frog is one such harbinger of change. The mountain yellow-legged frog was historically the most abundant frog in the Sierra Nevada, distributed widely in high elevation lakes and streams from Plumas to Tulare Counties. But some surveys have found that the species has disappeared from 70 to 90 percent of its former habitat.

Earthjustice sued the U.S. Fish and Wildlife Service to force the agency to pay attention to this precipitous decline. Fortunately, the agency found that the yellow-legged frog indeed warrants protections as an endangered species. Unfortunately, the agency said it was too busy with other projects to act on its own findings.

Earthjustice again sued and a federal appeals court ordered the government to establish protections. In 2013, federal Endangered Species Act safeguards were issued, and the mountain yellow-legged frog is now a protected species.

Case ID


Case Updates

January 10, 2006 | Legal Document

Yellow-legged Frog Complaint

Challenges the delay of Endangered Species Act protection for the Sierra Nevada population of the mountain yellow-legged frog (April 1, 2003)