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The paleognaths (Palaeognathae) are a clade of bird species of gondwanic distribution in Africa, South America, New Guinea, Australia and New Zealand. The group have more than 50 living species and includes the ostriches, rheas, kiwis, emus, cassowaries and tinamous. They are, with Neognathae, the two main lineages of modern birds (Neornithes). Extinct species assignment follows the Mikko's Phylogeny Archive, Paleofile.com website and Brodkob.