my dads friend who is a rancher, in his holistic management org. has a great presentation about jow he discovered that he could shoot coyotes endlessly and another would just pop up. so he stopped and he ended up with one coyote family who with the help of the ranch dog became respectful of the "rules" and also kept all other coyotes out. He ended up having much less problems. there is some science that backs this up as well. killing a coyote is kind of like topping a tree, 6 more low quality loner coyotes will immediately fill the void. what is preferable is to have one family structure that keeps the population stable based on territory. noone has ever succeeded killing the coyotes out