largest flying birds
I believe the largest living flying bird (in terms of body weight) is the Mute Swan (Cygnus olor) as seen in your local park. Max Wurr, Stanmore, UK. The largest (heaviest) flying bird today is the Kori Bustard (Ardeotis kori) of Africa, males weigh about 18kg, females about half that. The largest bird ever to fly were the Teratorns (a type of Condor), the largest of which, Argentavis magnificens, had a wingspan of 3 metres, and weighed 120kg.