I can't speak for other places but to the best of my knowledge they've never stocked Quail here in Arizona so all the birds we see are wild. I live in the Phoenix area and there are coveys of Quail everywhere. Unfortunately many are now suburban dwellers who have adapted very well to this environment. It is unusual for me to walk outside my house and NOT see any Quail. I haven't done much birdhunting in years but I also see many when we hike in the McDowell Mountains which is a forest preserve..
Of course the suburbs and the forest preserve are off limits for hunting so other than natural predators these Quail go undisturbed.
Jim

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