Aepyornis , believed to have been more than 3 m ( 10 ft ) tall and weighing close to 400 kg ( 880 lb ) , was at the time the world 's largest bird .
Aepyornis , one of the world 's largest birds , is believed to have been over 3 metres ( 10 ft ) tall , weighing close to 400 kg ( 880 lb ) .