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,

Colorado Parks and Wildlife is asking drivers to watch out after over 100 pronghorns were found dead on roads across eastern Colorado. CPW said pronghorns often get stuck on roads during snowstorms, as they tend to go under fences rather than over,

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

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