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[4] [5] The modern bird superorder Palaeognathae consists of ratites and the flighted Neotropic tinamous (compare to Neognathae). [6] Unlike other flightless birds, the ratites have no keel on their sternum—hence the name, from the Latin ratis ('raft', a vessel which has no keel—in contradistinction to extant flighted birds with a keel). [7]
Flightless birds are birds that cannot fly, as they have, through evolution, lost the ability to. [1] There are over 60 extant species, [2] including the well-known ratites (ostriches, emus, cassowaries, rheas, and kiwis) and penguins. The smallest flightless bird is the Inaccessible Island rail (length 12.5 cm, weight 34.7
Standing about 75 to 85 centimetres (30 to 33 in) tall and weighing approximately 5 kilograms (11 lb) as adult birds, [24] the flightless great auk was the second-largest member of both its family and the order Charadriiformes overall, surpassed only by the mancalline Miomancalla. It is, however, the largest species to survive into modern times.
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Endemic to Inaccessible Island in the Tristan Archipelago in the isolated south Atlantic, it is the smallest extant flightless bird in the world. The species was formally described by physician Percy Lowe in 1923 but had first come to the attention of scientists 50 years earlier.
National Geographic's Ed Yong says Cooper's research supports a newer theory about the flightless bird family: that they "evolved from small, flying birds that flapped their way between continents ...
Pages for logged out editors learn more. Contributions; Talk; ... Extinct flightless birds (6 C, 147 P) F. Fictional flightless birds (5 C, 10 P) P. Penguins (4 C, 33 ...
The kagu possesses 'nasal corns', structures covering its nostrils, which are a feature not shared by any other bird. This bird is a juvenile, lacking the brightly coloured bill of the adult. The kagu is a ground-living bird, 55 cm (21 + 1 ⁄ 2 in) in length. The weight can vary considerably by individual and by season, ranging from 700 to ...