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| Leading environmental factors that determine the existence of animals in a typical tree-shrub savanna grasses is the presence of one or two dry periods, the duration of which up to six months, limited rainfall, the availability of a well-developed grass cover and the absence of express tree layer, separately growing trees or groups of them are far from each other. All this causes the formation of distinct adaptations of animals to endure unfavorable periods of drought. The duration of hibernation in many insects, amphibians and some reptiles in these regions is considerably greater than in the seasonally wet communities. Migrations of birds and migrations of large herbivores acquire a special scope. The structure of the animal population of Savannah is greatly simplified compared with the seasonally wet forest and woodland. Abundance of herbivores feed ensures prosperity of a diverse range of herbivores, in the first place-hoofed animals. |