People that I know that raise quail lose a number to them to cooper hawks, feral cats, rattle snakes, hogs, foxes, and coyotes. With the exception of hawks, all are shot on sight.

Unfortunately too many preditors are nocturnal and have to be hunted at night. If there is good, thick ground cover like briar, blackberrys, etc, quails are able to run away from many preditors.