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The African ostrich is the largest living ratite. A large member of this species can be nearly 2.8 metres (9 ft 2 in) tall, weigh as much as 156 kilograms (344 lb), [18] and can outrun a horse. Of the living species, the Australian emu is next in height, reaching up to 1.9 metres (6 ft 3 in) tall and about 50 kilograms (110 lb). [18]
Name Binomial Name Status Distribution Great spotted kiwi: Apteryx haastii VU South Island, New Zealand Little spotted kiwi: Apteryx owenii LR/nt
Ratites are a category of (mostly) large flightless birds of the order Struthioniformes. Subcategories This category has the following 10 subcategories, out of 10 total.
It is in the infraclass Paleognathae, which contains all ratites. Extant members are found in South America. While the IOC World Bird List and the Clements Checklist categorise Rheiformes as its own order, [3] [4] the BirdLife Data Zone includes rheas, along with ostriches, tinamous, cassowaries, emu, and kiwis, in the order Struthioniformes. [5]
Rheidae / ˈ r iː ɪ d iː / is a family of flightless ratite birds which first appeared in the Paleocene. [2] It is today represented by the sole living genus Rhea, but also contains several extinct genera. [3]
They are distantly related to the African ostriches and Australia's emu (the largest and second-largest living ratites, respectively), with rheas placing just behind the emu in height and overall size. Most taxonomic authorities recognize two extant species: the greater or American rhea (Rhea americana), and the lesser or Darwin's rhea (Rhea ...
The five extant species fall into the family Apterygidae (/ ˌ æ p t ə ˈ r ɪ dʒ ə d iː /) and genus Apteryx (/ ˈ æ p t ər ɪ k s /). [5] Approximately the size of a domestic chicken, kiwi are the smallest ratites (which also include ostriches, emus, rheas, cassowaries and the extinct elephant birds and moa).
All Crypturellus are in the family Tinamidae, thus are classed as ratites, making them relatives of the cassowary, emu, kiwi, ostrich and rhea.Unlike these larger birds, however, tinamous still have the ability to fly, albeit somewhat weakly and not for prolonged periods (typically flying up, to perch on branches, when fleeing threats).