This 2007 image provided by the Wildlife Conservation Society shows Bob Inman with the Wildlife Conservation Society holding part of an elk leg found outside a wolverine den built into a snowfield in the Spanish Peaks mountain range in Montana, as fellow wildlife researcher Tony McCue looks on. Wolverines need deep mountain snows to survive, but the government said Friday, Feb. 1, 2013 that anticipated warming temperatures in coming decades will shrink their habitat, putting the species in danger of extinction. (AP Photo/Wildlife Conservation Society)
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