Drought
SoCAL quail are decimated the last several years. Dry, dry, dry .. and birds require a lot of water.
Of course, in SoCal Barbara Boxershorts has led an effort to put millions (literally) of acres in conservancy - no vehicles, no guns, no camp fires, ...... so maybe no quail matters little! Even fenced off an area in which I have maintained a couple of quail guzzlers for years! :barf::barf:
Of course if you are an illegal crossing the area, go for it!