This image was taken in the Mara, Kenya where it can be confused with White-bellied Bustard and Hartlaub's Bustard. White-bellied can be easily separated by its rather plain brown back and wings which show a strong speckled pattern in the other two species. Separating Black-bellied and Hartlaub's females is much more tricky -Hartlaub's females have an indistinct vertical cream line running down the foreneck and a speckled hindneck. Black-bellied Bustard females have a finely vermiculated brown neck (as seen in this image).
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Africa (entire continent rather than south of Sahara)
AN
Antarctica
AO
Atlantic Ocean
AU
Australasia (Wallacea (Indonesian islands east of Wallace's line), New Guinea and its islands, Australia, New Zealand and its subantarctic islands, the Solomons, New Caledonia, and Vanuatu)
PAL
Eurasia (Europe, Asia from the Middle East through central Asia north of the Himalayas, Siberia and northern China to Japan)
IO
Indian Ocean
LA
Latin America (Middle and South America)
MA
Middle America (Mexico through Panama)
NA
North America (includes the Caribbean)
NO
Northern oceans
OR
Oriental Region (South Asia from Pakistan to Taiwan, plus Southeast Asia, the Philippines, and Greater Sundas)