The Great Bustard - Otis tarda - is the heaviest flying bird in Europe with the heaviest verified specimen - 21 kg or 46lbs. The 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.

The Kori Bustard - Ardeotis kor - is the heaviest flying bird in Africa which weighs up to 20 kg or 44 lbs. Reports of specimens weighing 23 kg or 51lbs have been reported, but none of these have been verified. Body size is generally greater in the populations of southern Africa and body mass can vary based upon rain conditions.

According to the verified figures above it is the Great Bustard.