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,

While the reason for the creatures’ deaths may seem obvious, the reasons behind it are less apparent than you might think.

Colorado Parks and Wildlife is urging drivers to slow down and keep an eye out for pronghorns sheltering on the roads until the snow melts.

According to Colorado Parks and Wildlife, the herd likely congregated on the highway because of drifting snow on the ground and in the fields.

Colorado Parks and Wildlife is asking drivers to watch out after over 100 pronghorns were found dead on roads across eastern Colorado.

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