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The various ratite lineages were probably descended from flying ancestors that independently colonised South America and Africa from the north, probably initially in South America. From South America, they could have traveled overland to Australia via Antarctica, [31] (by the same route marsupials are thought to have used to reach Australia [32 ...
Ratites. Temporal range: Paleocene-Holocene 56–0 ... South American pampas Lesser rhea: Rhea pennata LR/nt Population in Chile and in Argentina Apterygidae.
Depending on the South American region, the rhea is known locally as ñandú guazu (Guaraní –or related Tupi nhandú-gûasú– meaning "big spider" [5] most probably concerning their habit of opening and lowering alternate wings when they run), [citation needed] ema , suri (Aymara and Quechua), [6] [7] or choique .
Phylogenomic studies have placed it as the sister group to extant Australasian and Oceanian ratites (i.e. the cassowaries, emus, and kiwis), thus putting it well within the ratite phylogenetic tree, with the South American rheas and African ostriches as successive outgroups.
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.
Diogenornis is an extinct genus of ratites, that lived from the Middle Paleocene [1] to the Early Eocene (Riochican to Casamayoran in the SALMA classification). [2] It was described in 1983 by Brazilian scientist Herculano Marcos Ferraz de Alvarenga based on fossils found in the Itaboraí Formation in southeastern Brazil. [3]
A family of Rhea pennata pennata in the wild in Chile, 2006 Head of a Darwin's rhea at the Edinburgh Zoo. The lesser rhea stands at 90 to 100 cm (35–39 in) tall. Length is 92 to 100 cm (36–39 in) and weight is 15 to 28.6 kg (33–63 lb).