Moving DayAs spring approaches in the desert and temperatures start to rise this herd of wild horses in Arizona began migrating to their summer grounds. In the coming days as many as 300 wild horses will congregate near the Salt River. Eventually the alpha stallion (in this picture the horse to the far left) of each small herd will give the signal and they will all swim across the river together. If there are young colts in the group the adult horses will form