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bustard
Bustards, including floricans and korhaans, are large and highly terrestrial birds mainly associated with dry open country and steppes in the Old World. They range in length from . They make up the family Otididae (formerly known as Otidae). Bustards are omnivorous and opportunistic eating leaves, buds, seeds, fruit, small vertebrates, and invertebrates.〔del Hoyo, J. Elliott, A. & Sargatal, J. (editors). (1996) ''Handbook of the Birds of the World. Volume 3: Hoatzin to Auks''. Lynx Edicions. ISBN 84-87334-20-2〕
==Description==
Bustards are all fairly large with the two largest species, the kori bustard (''Ardeotis kori'') and the great bustard (''Otis tarda''), being frequently cited as the world's heaviest flying birds. In both the largest species, large males exceed a weight , weigh around on average and can attain a total length of . The smallest species is the little brown bustard (''Eupodotis humilis''), which is around long and weighs around on average. In most bustards, males are substantially larger than females, often about 30% longer and sometimes more than twice the weight. They are among the most sexually dimorphic groups of birds. In only the floricans is the sexual dimorphism reverse, with the adult female being slightly larger and heavier than the male.
The wings have 10 primaries and 16-24 secondary feathers. There are 18-20 feathers in the tail. The plumage is predominantly cryptic.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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