We also have African Harlequin Quail (Coturnix delegorguei) although they arent very commonWe don't have true button quail here in the states, so thats a lot of why king quail are called by that name here. Our poultry/fowl importation laws keep up relatively restricted as to what species we can have. We are not even allowed to import the silver coturnix from Canada or the UK.
The quail we can get here are
Valleys
Gambles
Mearns
Bobwhites of every mutation
Coturnix japonica in rosetta, range, roux, italian, manchurian, autumn amber, pharaoh, A&M, english white, tibetan, tuxedos of most varieties, and a few more
Coturnix chinesis (king quail/button quail)
Mountain quail
Having raised coturnix for as long as I have, I have often wondered about the many Australian breeds of coturnix and how they are to raise. Have you ever raised the brown or stubble quail Urucubaca? If so how do they compare to coturnix?