Most of the galliform birds are more or less resident, but some of the smaller temperate species (such as quail) do migrate over considerable distances. Altitudinal migration is evidently quite common amongst montane species, and a few species of subtropical and subarctic regions must reach their watering and/or foraging areas through sustained flight. Species known to make extensive flights include the ptarmigans, sage-grouse ("Centrocercus"), crested partridge, green peafowl, crested argus, mountain peacock-pheasant ("Polyplectron inopinatum"), koklass pheasant ("Pucrasia macrolopha"), Reeves's pheasant and ("Syrmaticus reevesii"). Other species—most of the New World quails (also known as the toothed quails), the enigmatic stone partridge ("Ptilopachus petrosus") of Africa, guineafowl, and eared pheasants ("Crossoptilon")—are all notable for their daily excursions on foot which may take them many miles in a given day.