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- Flightless_bird abstract "Flightless birds are birds that can not fly. There are about 40 species in existence today, the best known being the ratites (ostrich, emu, cassowary, rhea and kiwi) and the penguins. Some birds evolved flightlessness in response to the release from predation, for example on oceanic islands, although this is likely not the case for the ratites as evolutionary origins suggest a continental biogeographical providence.[citation needed]Two key differences between flying and flightless birds are the smaller wing bones of flightless birds and the absent (or greatly reduced) keel on their breastbone. (The keel anchors muscles needed for wing movement.) Flightless birds also have more feathers than flying birds.New Zealand has more species of flightless birds (including the kiwis, several species of penguins, and the takahe) than any other country. One reason is that until the arrival of humans roughly a thousand years ago, there were no large land predators in New Zealand; the main predators of flightless birds were larger birds.Some flightless varieties of island birds are closely related to flying varieties, implying flight is a significant biological cost.[citation needed]The smallest flightless bird is the Inaccessible Island Rail (length 12.5 cm, weight 34.7 g). The largest (both heaviest and tallest) flightless bird, which is also the largest living bird, is the ostrich (2.7 m, 156 kg), although some extinct species grew to larger sizes.Flightless birds are the easiest to take care of in captivity because they do not have to be caged. Ostriches were once farmed for their decorative feathers. Today they are raised for meat and for their skins, which are used to make leather.There were also other families of flightless birds, such as the now extinct Phorusrhacidae, that evolved to be powerful terrestrial predators.Many domesticated birds, such as the domestic chicken, and domestic duck, have lost the ability to fly, though their wild ancestors, the red junglefowl and mallard, respectively, are perfectly capable of flight.".
- Flightless_bird thumbnail Penguins_Edinburgh_Zoo_2004_SMC.jpg?width=300.
- Flightless_bird wikiPageExternalLink what-on-earth-made-these-birds-give-up-flying.
- Flightless_bird wikiPageExternalLink en.
- Flightless_bird wikiPageExternalLink flightlessBirds.htm.
- Flightless_bird wikiPageID "927476".
- Flightless_bird wikiPageRevisionID "605184323".
- Flightless_bird hasPhotoCollection Flightless_bird.
- Flightless_bird subject Category:Flightless_birds.
- Flightless_bird comment "Flightless birds are birds that can not fly. There are about 40 species in existence today, the best known being the ratites (ostrich, emu, cassowary, rhea and kiwi) and the penguins.".
- Flightless_bird label "Ave no voladora".
- Flightless_bird label "Flightless bird".
- Flightless_bird label "Flugunfähiger Vogel".
- Flightless_bird label "Nielot".
- Flightless_bird label "Oiseaux inaptes au vol".
- Flightless_bird label "Нелетающие птицы".
- Flightless_bird label "不会飞的鸟".
- Flightless_bird label "飛べない鳥".
- Flightless_bird sameAs Flugunfähiger_Vogel.
- Flightless_bird sameAs Ave_no_voladora.
- Flightless_bird sameAs Oiseaux_inaptes_au_vol.
- Flightless_bird sameAs 飛べない鳥.
- Flightless_bird sameAs 날지_못하는_새.
- Flightless_bird sameAs Nielot.
- Flightless_bird sameAs m.03qqnt.
- Flightless_bird sameAs Q865137.
- Flightless_bird sameAs Q865137.
- Flightless_bird wasDerivedFrom Flightless_bird?oldid=605184323.
- Flightless_bird depiction Penguins_Edinburgh_Zoo_2004_SMC.jpg.
- Flightless_bird isPrimaryTopicOf Flightless_bird.
