Quail disappeared, just as pheasants did when raptors were given total protection. In areas of all types of habitat. Our state is going to be doing a quail reintroduction effort in the near future. As with the pheasant reintroduction efforts, first the building of habitat required, that quail can survive in. After this the quail will be released. I am predicting that their outcome will be the same as the pheasants, the raptors will wipe them out despite the proper habitat. However there should be less predation from the owls, but cooper and sharpshinned hawks will probably be what causes the effort to fail. If you want to bring back the species that were wiped out by the increased raptor numbers, that occurred after the raptors were protected, the raptors would need to be controlled number wise. I believe we have reached the point almost, where prey numbers control predator numbers, but only for certain times of the year. With raptors they can just fly a thousand miles or more if needed, to find more prey, after they wipe out an area.