On the Elk Trail | Episode 3: Escape from Snow Migration corridors are highways for multiple ungulate species, not just elk. Pronghorn and mule deer migrate first, before snow becomes too deep to pass with their small hooves and short legs. Elk follow next, using their longer legs to push through moderate snow. Moose are last, handling the deepest snow with their long legs and snowshoe-like hooves. While our cameras only captured elk and mule deer, the message is clear: intact migration corridor