I have bin fox calling and trapping on and off for about 30 years.20 yrs. ago I caught a coyote.and there have bin 2 or 3 shot over the last ten years. but two years ago there were six taken in traps and last yr. there were two taken in traps.This is in about a 25 x 25 sq. mile area. how long till they change the fox population. Right now there are fox every were