The Rhea is, above all other birds, a most characteristic representative of the Avifauna of the Patagonian subregion.
Subprovince, sub′prov-ins, n. a prime division of a province: in zoogeography, a division subordinate to a subregion.
Having shown this much we have next to deal with the peculiarities of the vast Palaearctic subregion.
The natural division of the subregion is that into an African and a Madagascar province.
(c) The Patagonian or Fuegian subregion being almost identical.