FILE - In this Friday, June 11, 2004 file photo Vance T. Vredenburg, a researcher from the University of California, Berkeley, inspects a mountain yellow-legged frog caught in a pond near in the Sierra Nevada near Ebbetts Pass, Calif. Hundreds of California's endangered yellow-legged frogs have been airlifted from their native Sierra Nevada lakes to big city zoos for booster shots and a chance at beating extinction from disease back in the wild. (AP Photo/Rich Pedroncelli,File)
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