A native California frog once on the brink of extinction is making an encouraging comeback in Yosemite National Park, raising hopes for amphibians like it worldwide that are dying off at an alarming rate, researchers said Monday.
The Sierra Nevada yellow-legged frog — little more than 3 inches long and known for the coloring under its hind legs — was once the most abundant amphibian in the mountain range.
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Their numbers began to plummet roughly a century ago as they were gobbled up by non-native trout stocked for fishing. Disease later struck, removing them from 90 percent of their native habitat in the Sierra, scientists say.
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