Yosemite releases 10,000th red‑legged frog

A frog story in Yosemite sounds small. It isn’t. The California red-legged frog had been missing from Yosemite Valley for roughly half a century, and that absence told you something was badly off in the valley’s wetlands. Now the park and its partners have released the program’s symbolic 10,000th frog, and the bigger news is that the frogs are no longer just being put back — they’re sticking. (wildlife.ca.gov) ### What frog are we talking about? The California red-legged frog is the largest native frog in the western United States, and it’s federally listed as threatened. (wildlife.ca.gov) It also happens to be California’s state amphibian. In Yosemite, this frog used to be part of the valley’s normal wetland life — ponds, meadows, stream edges — until that system broke down. (nps.gov) ### Why did it disappear? The main villain was the American bullfrog — a nonnative species introduced to Yosemite Valley in the 1950s. Bullfrogs are built to win these fights. They reproduce heavily, eat almost anything, and outcompete or prey on native amphibians. Yosemite biologists had been battling them since the 1990s, and successful eradication in the valley was finally achieved in 2019. Raccoons also added pressure because open garbage sites in earlier decades had boosted their numbers. (wildlife.ca.gov) ### So what changed this week? On May 7, 2026, Yosemite and its partners celebrated the release of the 10,000th frog in the recovery program. The frog was nicknamed “Twain,” which is a cute nod to Mark Twain’s jumping-frog story, but the symbolism matters more than the name — 10,000 is proof this was not a one-off rescue. (activenorcal.com) It was a sustained, decade-long rebuild. ### Where did 10,000 frogs come from? Not from some giant wild stash inside the park. The program built a pipeline. A dedicated rearing facility in San Francisco, created in 2016 through a zoo-park partnership, raises frogs from wild-collected eggs to juvenile stage in controlled conditions. Then those one- and two-year-old frogs get released into Yosemite Valley. Basically, conservationists gave the species a safer childhood before asking it to survive in the wild. (wildlife.ca.gov) ### How do we know this is working? Because Yosemite is now seeing multiple generations established in the valley. That’s the line between “we released animals” and “we restored a population.” Back in 2019, park ecologists had already found eggs in Yosemite Valley for the first documented breeding since reintroductions began. (wildlife.ca.gov) Since then, the frogs have persisted through drought, severe winters, and flooding. That resilience is the real milestone. ### Was this just about frogs? Not really. It was also about habitat. Yosemite tied restoration work to the Merced River Plan, improving wetlands, streambanks, and river systems the frogs need to breed and shelter. That matters because species recovery usually fails when agencies focus on the animal but not the place it lives. (wildlife.ca.gov) Here, they did both. ### Why does this matter beyond Yosemite? Because Yosemite may now be moving from rescue site to source population. Reports on the project say the valley’s frogs are considered self-sustaining enough that regular releases may no longer be needed there, and Yosemite could help support restoration in other parts of California. That’s the jump from local good news to statewide conservation value. (nps.gov) ### Bottom line? The 10,000th frog is the headline. The deeper story is that Yosemite fixed enough of the ecosystem for a missing native species to come back and start acting like it belongs there again. That’s much harder than releasing a frog. (msn.com) (wildlife.ca.gov)