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Rhea is a genus of large, flightless birds native to South America that belong to the ratite family, which also includes ostriches and emus. These birds are significant because they represent an important branch of avian evolution and are among the largest living birds by size and weight.
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Taxonomy · GBIF
GENUS
- KingdomAnimalia
- PhylumChordata
- ClassAves
- OrderRheiformes
- FamilyRheidae
via GBIF · CC0
Article
The rhea (/ˈriːə/ REE-ə), also known as the ñandú (/njænˈduː/ nyan-DOO) or South American ostrich, is a South American ratite (flightless bird without a keel on the sternum bone) of the order Rheiformes. Rheas are distantly related to the two African ostriches and Australia's emu (the largest, second-largest and third-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 pennata). The International Union for Conservation of Nature (IUCN) classifies the puna rhea as another species instead of a subspecies of the lesser rhea. The IUCN currently rates the greater and puna rheas as near-threatened in their native ranges, while Darwin's rhea is of least concern, having recovered from past threats to its survival. In addition, the feral population of the greater rhea in Germany appears to be growing. However, control efforts are underway and seem to succeed in controlling the birds' population growth. Similarly to ostriches and emus, rheas are fairly popular livestock and pets, regularly kept and bred on farms, ranches, private parks, and by aviculturists, mainly in North and South America and Europe.