The Galliformes are a clade of bird species of cosmopolitan distribution that, with the Anseriformes, belong to the branch Galloanserae. The group have more than 270 living species and includes the megapodes, chachalacas, guans, curassows, turkeys, grouse, New World quails, pheasants, partridges and guineafowl. They are, with Neoaves, the two main lineages of Neognathae. Extinct species assignment follows the Mikko's Phylogeny Archive and Paleofile.com websites.