Thousands of Geese Die in a Contaminated Lake

An open-pit mine in Butte, Mont. is the scene of a grisly mass death, after cold weather forces migrating birds to land there.

December 7, 2016
1:26 PM EST
The Berkeley Pit is one of the largest Superfund sites in the US. It is a toxic lake a mile long, a half mile wide, and nearly 1000 feet deep filled with heavy metals and toxic water from old underground copper mine shafts in Butte, Mont. Credit: William Campbell/Corbis via Getty Images