Deep, crusty snow piled up on fields in eastern Colorado after last week’s snowstorm is driving herds of pronghorn onto roads, and dozens of them are dying, state wildlife officials said. Pronghorn are being hit by drivers in droves as they seek refuge from snow-covered fields,

The pronghorns were killed by vehicles, likely large trucks, as they sought shelter from snow in fields on rural roads and highways in Colorado.

That included 53 being killed on Nov. 12 along U.S. Highway 36 east of Byers, according to Colorado Parks and Wildlife.