FILE: A rare Sierra Nevada red fox roams its icy terrain. This fox was photographed near Mount Bachelor, Ore., and may differ slightly in appearance from the foxes in the Sierra Nevada population.

The population of an elusive fox species that roams the Sierra Nevada likely only has about 50 individuals left.

Biologists from the California Department of Fish and Wildlife finally captured and attached a GPS collar to one of these rare foxes near Mammoth Lakes in January. They’ve been trying to trap one in the Sierra for years. 

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After giving the fox a collar, the scientists set it free. Tracking every move of this one Sierra Nevada red fox offers a unique opportunity to study the endangered species, the agency announced on Monday. 

“This represents the culmination of 10 years of remote camera and scat surveys to determine the range of the fox in the........

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