Earlier this year, 350 endangered mountain yellow-legged frogs hopped into their new home in Bluff Lake in Southern California’s San Bernardino Mountains. It’s the latest step in a long-running battle fought by authorities, including the U.S. Fish and Wildlife Service, the U.S. Geological Survey, the California Department of Fish and Wildlife and conservationists to stave off extinction of this highly threatened species. The mountain yellow-legged frog (Rana muscosa), despite its name, can display a wide array of color variations, often a mix of brown and yellow, but also gray, red, or greenish-brown. There are two distinct populations of this medium-sized frog: one in Southern California and another up north in the Sierra Nevada. Mountain yellow-legged frogs have a wide array of color variations, ranging from yellow and brown to red and gray. Image courtesy of San Diego Zoo Wildlife Alliance. Biologists say this frog was once so common you couldn’t walk through its range without tripping on one. That’s far from the case today in Southern California. The last comprehensive surveys carried out in 2023 counted fewer than 200 adults in the wild. Though exact numbers are unclear, conservationists say the northern population is much more robust. The southern reintroductions began in 2010 in the San Jacinto Mountains. This year’s release is part of what Sean Bruce, assistant curator of fishes and invertebrates at Birch Aquarium, describes as a “numbers game” to push back against possible extinction. In 2023, 70 frogs were released into Bluff Lake, marking the first time…This article was originally published on Mongabay

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