Pastoral nomads move with their households in search of pasture for their animals. There are an estimated 30-40 million of them in the world. Livestock is central to their livelihood and the basis of their culture. Their movement is seasonal, linked to rainfall and the availability of good forage for their animals. - See more at: http://newint.org/features/1995/04/05/facts/#sthash.noX6t2lJ.dpuf