Dont the wolves drive off yotes? The region does have some wolfs I belive.
I live and hunt in Wolf country Idaho. While its true they do eat Coyotes the presence of wolves does not mean there are no Coyotes, they just learn to be more quiet and sneaky. I hear Wolves many nights every year, especially in the warm summer evenings. The coyotes that are still around have learned not to yap (very much)