Savanna Biome
A savanna, or savannah, is a grassland ecosystem characterized by the trees being sufficiently small or widely spaced so that thecanopy does not close. The open canopy allows sufficient light to reach the ground to support an unbroken herbaceous layer consisting primarily of C4 grasses.[1] Some classification systems[which?] also recognize a grassland savanna from which trees are absent.[2] This article deals only with savanna under the common definition of a grassy woodland with a significant woody plant component.
It is often believed that savannas feature widely spaced, scattered trees. However, in many savannas, tree densities are higher and trees are more regularly spaced than in forest. Savannas are also characterized by seasonal water availability, with the majority of rainfall confined to one season. Savannas are associated with several types of biomes. Savannas are frequently in a transitional zone betweenforest and desert or prairie. Savanna covers approximately 20% of the Earth's land area. The largest area of savanna is in Africa.
Baobab tree in Savanna
http://www.youtube.com/watch?v=M9V9bVEDSVs&feature=related
Acacia Tree and Girrafe
PASTORALISTS AND THEIR LIFE
Who are pastoralists?
Pastoralists are people who depend for their living primarily on livestock. They inhabit those parts of the world where the potential for crop cultivation is limited due to lack of rainfall, steep terrain or extreme temperatures. In order to optimally exploit the meager and seasonally variable resources of their environment and to provide food and water for their animals, many pastoralists are nomadic or semi-nomadic.The type of livestock pastoralists keep varies according to area, and includes sheep, goats, cattle and camels, but also yaks and horses in Central Asia, buffalo in South Asia, llamas and alpacas in South America, and reindeer in the Palearctic region. An important characteristic of pastoralists is their close relationship with their animals. The identity of pastoralists is based on the close association with their livestock that forms a key component of their social and ritual life. By keeping animals under conditions that are close to the wild, but giving them the benefit of protection and health care, pastoralists represent a cultural counterpoint to industrialized animal production in the west.
There is no reliable information available on the number of pastoralists worldwide. According to one estimate, there are around 17.3 million pastoralists in Africa, 3.4 million in the Middle East and South Asia and no more than 2 million in Central Asia (Sandford, 1983). 
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