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Africa includes two regions of the zoographic area known as the Paleotropical realm: the Afrotropical region, which comprises the continent south of the Sahara and the southwestern part of Arabia, and the Madagascan region. The continent also includes a southern part of the Palaearctic (Old World) region of the Holarctic realm (i.e., the lands of the Northern Hemisphere), consisting of northwestern and North Africa south to roughly the Tropic of Cancer. Africa is best known for the enormous diversity and richness of its wildlife. It has a greater variety of large ungulates, or hoofed mammals (some 90 species), and freshwater ...(100 of 33001 words)