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Genus Otis
Great Bustard - The male of this huge bird is possibly the heaviest living flying animal, alongside the similarly sized Kori Bustard. An adult male typically is 90–110 cm long with a 2.1–2.5 m wingspan and usually weighs from 10 to 16 kg . The heaviest known bird was about 21 kg , although larger specimens have been reported but not verified. An adult male is brown above and white below, with a long grey neck and head. The breast and lower neck sides are chestnut. In the breeding season, the male has long white neck bristles. In flight, the long wings show large areas of white.