The Masai are a very famous warrior tribe in Kenya whose lives center around herding cattle. They live in small settlements of 8-15 huts per kraal. Their settlements are surrounded by a thornbush fence as an added form of protection. The two-inch long thorns of the thornbush are as sharp as barbed wire and the men are responsible for tying branches together to form the fence. In the evening, the cattle, goats, and other domestic animals are brought inside the kraal for protection against wild animals.
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More at http://www.kent.k12.wa.us/staff/DarleneBishop/kenya/masai/masai.html