This is what happened when the farmers started diddeling them.

A few years ago a group of tree-huggers was presenting an alternative to
> the ranchers for controlling the coyote population.
>
> It seemed that, after years of the ranchers using the tried and true
> methods of shooting and/or trapping the predators, the tree-huggers had
> a "more humane" solution. What they proposed was for the animals to be
> captured alive, then castrate the males, then let them loose again, and
> then the population would be controlled.
>
> I kid you not, this was actually proposed to the Wyoming Wool and Sheep
> Grower's association. Well, all the ranchers thought about this amazing
> idea. Finally, an old boy in the back stood up, kicked his hat back and
> said: "Son, I don' think you understand the problem. These coyotes ain't
> ****ing' our sheep, they're eating them!!"