Mule deer spend the summers in high mountain meadows. During the winters, they migrate to favorite feeding grounds where south facing slopes offer more plentiful food. Pronghorn Pronghorn antelope feed on shrubs and grasses. They live on open meadows and are the fastest land animals in the western hemisphere. They can easily run 40-50 miles per hour.
Pronghorn are active both day and night, and rely on vision to detect predators.
Their eyesight is so keen that they can detect movement up to four miles away.