The Subfamily Numidinae is a group of birds that belong to the family Phasianidae. They are commonly known as Guineafowl or simply Guinea. These birds are native to Africa and have a unique appearance with their distinct plumage pattern and unfeathered heads. There are several synonyms for the term "Subfamily Numidinae" such as Numididae, Helmeted Guineafowl, and Ptilopachinae. Numididae is a family name that is used interchangeably with Subfamily Numidinae. Helmeted Guineafowl is a more specific term that refers to one of the most well-known species within this group. Ptilopachinae is another synonym for Subfamily Numidinae, and it refers to a subfamily of the family Phasianidae that includes the African francolins.