People who moved from one place to another, as a community, with all their belongings, were called nomads. These nomads moved from place to place in search of food and a livelihood. The nomadic pastoralists had herds of goats and sheep, or camels and cattle. Finding pasture for their herds was the main purpose of their constant movement. The nomads moved between their summer and winter grazing grounds. In winter they usually lived on the low hills and the dry scrub forests provided pasture for their herds. They lived on the low hills during winter as the high mountains were snow covered. During summer, that is, by the end of April the nomads packed their belongings, round up their herds and start trekking towards the northern mountains. As the snow melted the mountains were converted into carpets of lush green grass. This provides ample pasture for their herds.The nomadic pastoralists thus moved annually between their summer and winter grazing grounds. When the pasture was exhausted or unusable in one place they moved their herds and flock to new areas. The continuous movement of the nomads with their grazing herds ensured that the natural pastures were not over used. The movement allowed the grass and foliage to grow again and this preserved the environment.