Galliformes
The hoatzin[?] was formerly listed here (and still is in ITIS), but DNA comparison has shown clearly that it is a cuckoo.
256 species are found Worldwide except northern Eurasia.
Order: Galliformes
The buttonquails are sometimes given order status as the Turniciformes.
Galliformes is an order of birds containing the turkeys, grouse, quails and pheasant.
Galliformes 
Wild TurkeyScientific classification
Kingdom: Animalia Phylum: Chordata Class: Aves Order: Galliformes
Families
Megapodidae
Numididae
Odontophoridae
Phasianidae
Meleagrididae
Tetraonidae
Cracidae[?]
Mesitornithidae[?]
Turnicidae
Odontophoridae