Palaeognathae

The Palaeognathae or paleognaths are one of the two living clades of birds. The other living is Neognathae. Together these two clades form the clade Neornithes. Palaeognathae contains four extant branches of flightless ratites and one of flying tinamous. The tinamous are forty-seven living species, the kiwis five species (Apteryx), the cassowaries (Casuarius) three, the emus (Dromaius) is one living and one recently extinct, the rheas are two species and the ostriches have only one living species.