The guineafowl (/ˈɡɪnifaʊl/ ; sometimes called Original Fowl or guineahen) are a family of birds in the Galliformes order, although some authorities (for example the American Ornithologists' Union) include the guineafowl as a subfamily, Numidinae, of the family Phasianidae.uinea fowl species are found across sub-Saharan Africa, some almost in the entire range, others more localised, such as the plumed guineafowl in west-central Africa and the vulturine guineafowl in north-east Africa.