In this Dec. 14, 2016 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. The companies responsible for the pit are proposing additional technologies such as radars, lasers and drones to prevent another mass death similar to the several thousand snow geese that died in the pit last November. (AP Photo/Matt Volz)
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