FILE - In this May 16, 2018, file photo, an adult peregrine falcon circles near its nest on a ledge overlooking Lake Mead in Temple Bar, Ariz. A Nevada state wildlife biologist is finding that not even the fastest bird on Earth can escape mercury contamination. Joe Barnes tells the Las Vegas Review-Journal the toxic element is turning up in feathers of peregrine falcons from coast to coast, including at the Lake Mead National Recreation Area. (Andrea Cornejo/Las Vegas Review-Journal via AP, File)
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