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What I read somewhere is that Kori and Arabian Bustard males can reach over 20 kg, followed by Great Bustard 18kg. Mute Swan can reach more (in captivity?), but probably cannot fly then.
Guinness doesn't list the heaviest flying bird on their web page. Instead, they list the heaviest raptor: Andean Condor, 12kg (if we're now referring to new world vultures as raptors once again).
Just checked the Handbook of the Birds of the World:
Male Mute Swan (Cygnus olor) recorded up to 22.5 kg.
Male Kori Bustard (Ardeotis kori) recorded up to 19 kg.
Male Great Bustard (Otis tarda) recorded up to 18kg.
Hunters have claimed 24kg for Great Bustard which would place this species on a level with the Mute Swan as the heaviest flying bird in the world.
I recall as a kid reading in the Guiness book that it was the Kori Bustard or Paauw (sp?) - obviously a local nickname - I assume that answer was based on average bird size rather than individual biggies.