Female Mountain Yellow-legged Frog with newly laid eggs. The Mountain Yellow-legged Frog, Rana sierrae, has gone in the past century from being common throughout its range to one of the rarest. Its original range was in the mountains of California and adjacent Nevada. It is now found mostly in lakes within National Park boundaries, such as Sequoia and Yosemite. Frogs are still found in those locations because those lakes are not stocked with non-native fish. The USFWS in January 2003 released findings that the listing of the frog as endangered was warranted, but to date this has not been done. The Mountain Yellow-legged Frog has been renamed Rana sierrae and its former name, Rana muscosa, is now limited to the Foothill Yellow-legged Frog.