<P> The heaviest bird ever capable of flight was Argentavis magnificens, the largest member of the now extinct family Teratornithidae, found in Miocene - aged fossil beds of Argentina, with a wingspan up to 5--6 m (16--20 ft), a length of up to 1.26 m (4.1 ft), a height on the ground of up to 1.5--2 m (4.9--6.6 ft) and a body weight of at least 71 kg (157 lb). Rivaling Argentavis in wingspan if not in bulk and mass, another contender for the largest known flying bird ever is Pelagornis sandersi, which had a wingspan of up to 7.3 m (24 ft). </P> <P> The following is a list of the heaviest living bird species based on maximum reported or reliable mass, but average weight is also given for comparison . These species are almost all flightless, which allows for these particular birds to have denser bones and heavier bodies . Flightless birds comprise less than 2% of all living bird species . </P> <Table> <Tr> <Th> Rank </Th> <Th> Animal </Th> <Th> Binomial Name </Th> <Th> Average mass (kg (lb)) </Th> <Th> Maximum mass (kg (lb)) </Th> <Th> Average total length (cm (ft)) </Th> <Th> Flighted </Th> </Tr> <Tr> <Td> </Td> <Td> Ostrich </Td> <Td> Struthio camelus </Td> <Td> 104 (230) </Td> <Td> 156.8 (346) </Td> <Td> 210 (6.9) </Td> <Td> No </Td> </Tr> <Tr> <Td> </Td> <Td> Somali ostrich </Td> <Td> Struthio molybdophanes </Td> <Td> 90 (200) </Td> <Td> 130 (287) </Td> <Td> 200 (6.6) </Td> <Td> No </Td> </Tr> <Tr> <Td> </Td> <Td> Southern cassowary </Td> <Td> Casuarius casuarius </Td> <Td> 45 (99) </Td> <Td> 85 (190) </Td> <Td> 155 (5.1) </Td> <Td> No </Td> </Tr> <Tr> <Td> </Td> <Td> Northern cassowary </Td> <Td> Casuarius unappendiculatus </Td> <Td> 44 (97) </Td> <Td> 75 (170) </Td> <Td> 149 (4.9) </Td> <Td> No </Td> </Tr> <Tr> <Td> </Td> <Td> Emu </Td> <Td> Dromaius novaehollandiae </Td> <Td> 33 (73) </Td> <Td> 70 (150) </Td> <Td> 153 (5) </Td> <Td> No </Td> </Tr> <Tr> <Td> 6 </Td> <Td> Emperor penguin </Td> <Td> Aptenodytes forsteri </Td> <Td> 31.5 (69) </Td> <Td> 46 (100) </Td> <Td> 114 (3.7) </Td> <Td> No </Td> </Tr> <Tr> <Td> 7 </Td> <Td> Greater rhea </Td> <Td> Rhea americana </Td> <Td> 23 (51) </Td> <Td> 40 (88) </Td> <Td> 134 (4.4) </Td> <Td> No </Td> </Tr> <Tr> <Td> 8 </Td> <Td> Domestic turkey / wild turkey </Td> <Td> Meleagris gallopavo </Td> <Td> 13.5 (29.8) </Td> <Td> 39 (86) </Td> <Td> 100 - 124.9 (3.3--4.1) </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 9 </Td> <Td> Dwarf cassowary </Td> <Td> Casuarius bennetti </Td> <Td> 19.7 (43) </Td> <Td> 34 (75) </Td> <Td> 105 (3.4) </Td> <Td> No </Td> </Tr> <Tr> <Td> 10 </Td> <Td> Lesser rhea </Td> <Td> Rhea pennata </Td> <Td> 19.6 (43) </Td> <Td> 28.6 (63) </Td> <Td> 96 (3.2) </Td> <Td> No </Td> </Tr> <Tr> <Td> 11 </Td> <Td> Mute swan </Td> <Td> Cygnus olor </Td> <Td> 11.87 (26.2) </Td> <Td> 23 (51) </Td> <Td> 100 - 130 (3.3 - 4.3) </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 12 </Td> <Td> Great bustard </Td> <Td> Otis tarda </Td> <Td> 10.6 (23.4) </Td> <Td> 21 (46) </Td> <Td> 115 (3.8) </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 13 </Td> <Td> King penguin </Td> <Td> Aptenodytes patagonicus </Td> <Td> 13.6 (30) </Td> <Td> 20 (44) </Td> <Td> 92 (3) </Td> <Td> No </Td> </Tr> <Tr> <Td> 14 </Td> <Td> Kori bustard </Td> <Td> Ardeotis kori </Td> <Td> 11.4 (25.1) </Td> <Td> 20 (44.1) </Td> <Td> 150 (5) </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 14 </Td> <Td> Trumpeter swan </Td> <Td> Cygnus buccinator </Td> <Td> 11.6 (25.1) </Td> <Td> 17.2 (38) </Td> <Td> 138 - 165 </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 15 </Td> <Td> Wandering albatross </Td> <Td> Diomedea exulans </Td> <Td> 11.9 (24) </Td> <Td> 16.1 (38) </Td> <Td> 107 - 135 </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 16 </Td> <Td> Whooper swan </Td> <Td> Cygnus cygnus </Td> <Td> 11.4 (25) </Td> <Td> 15.5 (32) </Td> <Td> 140 - 165 </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 17 </Td> <Td> Dalmatian Pelican </Td> <Td> Pelecanus crispus </Td> <Td> 11.5 (25) </Td> <Td> 15 (33.1) </Td> <Td> 183 (6) </Td> <Td> Yes </Td> </Tr> <Tr> <Td> 18 </Td> <Td> Andean condor </Td> <Td> Vultur gryphus </Td> <Td> 11.3 (25) </Td> <Td> 14.9 (33) </Td> <Td> 100 - 130 (3.3 - 4.3) </Td> <Td> Yes </Td> </Tr> </Table> <Tr> <Th> Rank </Th> <Th> Animal </Th> <Th> Binomial Name </Th> <Th> Average mass (kg (lb)) </Th> <Th> Maximum mass (kg (lb)) </Th> <Th> Average total length (cm (ft)) </Th> <Th> Flighted </Th> </Tr>

Heaviest bird in the world that can fly