An curved arrow pointing right. If migrating birds land on Montana's Berkeley Pit for just a few hours, they die. Now, miners use a rifle, drones, and lasers to scare them away. More from Science ...
Berkeley Pit, an open-pit copper mine that has been allowed to fill with water since its closure in 1982, is seen in this October, 2003 file photo. Credit: WALTER HINICK /THE MONTANA STANDARD VIA ...
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