Cats. Outdoor cats that you feed only once a day. That should do it.
We had a neighbor with a half dozen semi-wild cats that he fed once a day. We never had any quail in our neighborhood, despite being only a block from a year-round creek and three blocks from a wildlife area.
Said neighbor moved and took the cats with him, now a year later we have lots and lots of quail. They are ground nesters so the cats have a big impact of their breeding.
I don't have a problem with these quail though, because I've got a ton of gophers, so I only garden in containers. (Cats controlled the gophers too, never had much of a problem with them either when the cats were around)
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