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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
Kākāpō are the only flightless bird that has a lek breeding system. [52] Males loosely gather in an arena and compete with each other to attract females. Females listen to the males as they display, or "lek". [53] They choose a mate based on the quality of his display; they are not pursued by the males in any overt way.
[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]
Dromornis is a genus of large to enormous prehistoric birds native to Australia during the Oligocene to Pliocene epochs. The species were flightless, possessing greatly reduced wing structures but with large legs, similar to the modern ostrich or emu.
Fictional flightless birds (5 C, 10 P) P. Penguins (4 C, 33 P) R. Ratites (10 C, 49 P) S. Struthioniformes (1 C, 6 P) Pages in category "Flightless birds"
The current population of wild kagus is about 250–1000 birds, and the species is the focus of a decades-long conservation effort. The kagu's initial decline was caused by subsistence hunting. The bird was trapped extensively for the European pet trade [5] and for museums and zoos until it was afforded protection. [14]
Rheas are large, flightless birds with grey-brown plumage, long legs, and long necks, similar to an ostrich. Large males of R. americana can reach 170 cm (67 in) tall at the head, 100 cm (39 in) at the back [13] and can weigh up to 40 kg (88 lb). [14] The lesser rhea is smaller, with a height of 100 cm (39 in). [13]
The generic name Atlantisia was named ... The Inaccessible Island rail is the smallest living flightless bird in the world, measuring 13 to 15.5 cm (5.1–6.1 in ...