Herbivorous, feeding on leaves, twigs and herbaceous plants.
In the wild, 6 to 8 years and around 15 years in captivity.
From the age of 18 months old, mating takes place between October and November. 1 or 2 fawns are born between late May and mid-June after a 6 ½ month gestation period and are weaned after 4 months.
Grey wolf, coyote and cougar. The young can also be the prey of black bear, bobcat and Canada Lynx.