Jhum Cultivators: Shifting cultivation is also called jhum cultivation. The shifting cultivators were living in the hilly and forested tracts of north-east and central India. Their life depended on free movement within forests as it enabled them to use the land and forests for growing their crops. Hunters and Gatherers: Many tribal groups depended on hunting the animals and gathering forest produce; for their survival. The Khonds of Orissa are example of such community. They used to go on a collective hunting. They ate fruits and roots collected from the forest. They extracted cooking oil from the seeds of sal and mahua. Forest shrubs and herbs were used for medicinal purposes. They also sold some forest produce in the nearby markets Some of the tribals also did odd jobs in villages; like carrying loads and building roads. Some others worked as farm labourers. Shrinking supplies of forest produce to the tribals. As a result, many tribal people began to wander around in search of work. But many of them were not willing to do work for others because they thought it below their dignity to work for others. The Baigas of central India were such community.