Federally threatened California red-legged frogs are showing signs of a return to Yosemite Valley in Yosemite National Park after a 50-year absence following their reintroduction as part of a collaborative effort by the National Park Service, Yosemite Conservancy, the San Francisco Zoo & Gardens, U.S. Fish & Wildlife Service, California Department of Fish & Wildlife and NatureBridge. https://www.nps.gov/yose/learn/news/threatened-california-red-legged-frogs-making-a-comeback-in-yosemite-national-park-after-a-50-year-absence.htm