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FILE - In this Dec. 14, 2016 file photo, a Phoenix Wailer bird deterrent sits on the bank of the Berkeley Pit in Butte, Mont. The wailer, which emits different sounds at random times, is one of the devices used to keep birds from landing in the toxic water of the former copper mine. Mining companies hope to prevent another massive die-off of geese in the polluted waters of  the Berkeley Pit in Montana. The Montana Standard reported Friday, March 9, 2018, bird experts worry that with the annual northward migration of geese underway, birds might again be tempted to rest in the water in Berkeley Pit in Butte. In November 2016, an estimated 3,000 snow geese died when they landed in the acidic, metal-laden water.  (AP Photo/Matt Volz, File)

FILE - In this Dec. 14, 2016 file photo, a Phoenix Wailer bird deterrent sits on the bank of the Berkeley Pit in Butte, Mont. The wailer, which emits different sounds at random times, is one of the devices used to keep birds from landing in the toxic water of the former copper mine. Mining companies hope to prevent another massive die-off of geese in the polluted waters of the Berkeley Pit in Montana. The Montana Standard reported Friday, March 9, 2018, bird experts worry that with the annual northward migration of geese underway, birds might again be tempted to rest in the water in Berkeley Pit in Butte. In November 2016, an estimated 3,000 snow geese died when they landed in the acidic, metal-laden water. (AP Photo/Matt Volz, File)

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