My ranch lies near Coalinga, Ca. Up until this year... or perhaps mid 2010, wild pigs were out of control. We couldn't go to my ranch without seeing them. A friend over a ridge near Priest Valley had the same issue on his ranch. So many that 'damage' was becoming a major problem.
Now this year... I can't find a pig, no sign, not a track to be seen. This after YEARS of overpopulation.
Recently my band played over near Holister, Ca, on a ranch just south... near Tres Pinos. I asked the manager of the ranch what he was seeing and he reported the same... no pigs, as in NONE.
Now they didn't just 'disappear'.. or die out... but I'm not sure what happened to them. So unless some catastrophe struck them someone, somewhere, has one major pig problem. - JamesJM