Rheiformes is an order that contains the family Rheidae (rheas).[3] 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] Of the two extant species of rheas recognized by the IUCN Red List, as of 2022[update], Rhea americana is listed as near threatened,[6] while Rhea pennata is listed as least concern.[7] From 2014 to 2022, the IUCN recognised Rhea tarapacensis as a separate species, and listed it as near threatened in its last assessment in 2020;[8] in 2022, it was again recognised as a subspecies of R. pennata.[7]: Taxonomy
^Kirwan, Guy M.; Korthals, Arne; Hodes, Carly E. (2 April 2021). "Greater Rhea (Rhea americana), version 2.0". In Keeney, B. K. (ed.). Birds of the World. Ithaca, New York, United States: Cornell Lab of Ornithology. doi:10.2173/bow.grerhe1.02.
^"Rheiformes". Global Biodiversity Information Facility. Retrieved 30 November 2022.
^ abGill, Frank; Donsker, David; Rasmussen, Pamela, eds. (11 August 2022). "Ratites: Ostriches to tinamous". IOC World Bird List (version 12.2 ed.). Retrieved 29 November 2022.
^Clements, James F.; Schulenberg, Thomas S.; Iliff, Marshall J.; Fredericks, Thomas A.; Gerbracht, Jeff A.; LePage, Denis; Billerman, Shawn M.; Sullivan, Brian L.; Wood, Christopher L. (25 October 2022). "The eBird/Clements checklist of Birds of the World" (v2022 ed.). Ithaca, New York, United States: Cornell Lab of Ornithology. Retrieved 29 November 2022.
^"HBW and BirdLife Taxonomic Checklist". BirdLife Data Zone (version 6.0b ed.). BirdLife International. July 2022. Retrieved 29 November 2022.
^BirdLife International (12 August 2022). "Rhea americana". IUCN Red List of Threatened Species. 2022: e.T22678073A219615764. Retrieved 21 December 2022.|volume= / |date= mismatch
^ abBirdLife International (1 August 2022). "Rhea pennata". IUCN Red List of Threatened Species. 2022: e.T22678081A217016710. Retrieved 21 December 2022.|volume= / |date= mismatch
^BirdLife International (24 June 2020). "Rhea tarapacensis". IUCN Red List of Threatened Species. 2020: e.T22728206A177987446. doi:10.2305/IUCN.UK.2020-3.RLTS.T22728206A177987446.en. Retrieved 30 November 2022.|date= / |doi= mismatch
Rheiformes is an order that contains the family Rheidae (rheas). It is in the infraclass Paleognathae, which contains all ratites. Extant members are found...
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