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Nomads keep moving for different reasons. Nomadic foragers move in search of game, edible plants, and water. Aboriginal Australians, Negritos of Southeast Asia, and San of Africa, for example, traditionally move from camp to camp to hunt and gather wild plants. Some tribes of the Americas followed this way of life.
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travelswithWeAnswer:
First, we must define what a nomad is. A nomad is a member of a people with no permanent abode and travels from place to place to find fresh pasture for their livestock. We then move to the next part of the question, why do they travel in a tribe? Since they did not stay in one place, they would need protection against predators and other animals. They would travel a lot, meaning they would explore several places they had no familiarity with and would need to stick together in case of any unpleasant surprise. Also, humans are animals; think of a pack of wolves, they hunt together to be much more effective and successful, the same would go for the nomads.