As rams mature, their horns form a circle when seen from the side. As lambing approaches, ewes seek solitude and protection from predators in the most rugged cliffs available on their spring ranges. Ewes bear a single lamb, and the ewe-lamb pairs remain in the lambing cliffs a few days until the lambs are strong enough to travel. Lambs begin feeding on vegetation within a week after birth and are usually weaned by October. Normally, ewes have their first lamb at age 3 and produce a lamb annually.
Sheep have well-developed social systems.
Adult rams live in bands which seldom associate with ewe groups except during the mating season in late November and early December. The horn clashing for which rams are so well known does not result from fights over possession of ewes, but is a means of establishing order. They occur more frequently just before the rut when rams are moving among the ewes and meet unfamiliar rams of similar horn size. The diets of Dall sheep vary from range to range. During summer, food is abundant, and a wide variety of plants is consumed.