List of Rheiformes by population

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This is a list of Rheiformes species by global population. While numbers are estimates, they have been made by the experts in their fields. For more information on how these estimates were ascertained, see Wikipedia's articles on population biology and population ecology.

The IOC World Bird List (version 15.1) recognizes 2 species of Rheiformes. [1] As of December 2025, IUCN/BirdLife International have assessed all members, and 1/2 (50%) of species have population estimates. This list follows IUCN classifications for species names. Where IUCN classifications differ from other ornithological authorities, alternative names are noted.

Species by global population

Common name Binomial name Population Status TrendNotesImage
Greater rhea Rhea americanaunknown [2] NT [2] Decrease2.svg [2] Rhea americana qtl2.jpg
Lesser rhea

(Darwin's rhea)

Rhea pennata1,000-2,499 [3] LC [3] Decrease2.svg [3] Values are preliminary estimate for number of mature individuals. [3] Rhea pennata pennata (6).JPG
  1. ↑ "Ratites: Ostriches to tinamous – IOC World Bird List". www.worldbirdnames.org. Retrieved 2025-12-22.
  2. 1 2 3 BirdLife International (2022). "Rhea americana". IUCN Red List of Threatened Species . 2022 e.T22678073A219615764. doi: 10.2305/IUCN.UK.2022-2.RLTS.T22678073A219615764.en . Retrieved 2025-12-22.
  3. 1 2 3 4 BirdLife International (2022). "Rhea pennata". IUCN Red List of Threatened Species . 2022 e.T22678081A217016710. doi: 10.2305/IUCN.UK.2022-2.RLTS.T22678081A217016710.en . Retrieved 2025-12-22.
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