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Deserts are sub divided into four types- Hot and Dry desert, Semi arid desert, Coastal desert and Cold desert. Deserts are rich in nutrients with little or no organic matter. This biome supports few large mammals, insects reptiles and birds, rabbits, rats, ante lopes and ground squirrels.

Savanna are characterized by coarse grass and scattered trees on the margins of the tropics where rainfall is seasonal and wet seasons alternate with dry season. This biome supports the greatest variety of animals, such as zebra, giraffe, elephant, etc.