Pronghorn carcasses discovered near Pinedale, where an outbreak of pneumonia is killing hundreds of antelope, are shown. What role the harsh winter weather has played in the outbreak is hard to say, wildlife officials said. But they’re certain the weather is killing fawns in one of Wyoming’s largest mule deer herds.

This winter is killing mule deer fawns in Wyoming’s largest herd, and may be exacerbating a pneumonia outbreak in pronghorn near Pinedale.

“This is a real deal winter and we’re in the thick of it at the moment,” Ian Tator, the Wyoming Game and Fish Department’s terrestrial habitat supervisor, said Friday afternoon.

Mule deer fawn deaths

Severe winters tend to claim a large percentage of fawns in the Wyoming Range mule deer herd. The most severe winter in the last decade was in 2017, when Wyoming Game and Fish Department officials estimated some 86% of juveniles in the 30,000-or-so animal strong herd died.

Contact Billy Arnold at 732-7063 or

Environmental Reporter

Billy Arnold has been covering the Greater Yellowstone Ecosystem and the people who manage it since January 2022. He previously spent two years covering Teton County government, and a year editing Scene. Tips welcomed.

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