Which is the biggest bird in the world?

Ostrich is the largest living bird in the world. An adult ostrich weighs up to 150 kilograms and has a maximum height of 6 feet. They also held the record for the fastest speed of any bird in the land and largest egg of any living birds. read more

Southern cassowary – 2nd among largest birds in the world Average mass : 45 kg, Maximum mass : 85 kg, Average total length : 155 cm Southern cassowary, also known as double-wattled cassowary, is the second largest bird in the world. read more

Many of the largest flying birds in the fossil record may have been members of the Ciconiiformes. The heaviest flying bird ever, Argentavis magnificens, is part of a group, the teratorns, that are considered an ally of the New World vultures. The largest ibis is the giant ibis (Thaumatibis gigantea). read more