Little balls of cheap hamurger - dose of 10/80 in the middle. Dropped on frozen lakes from aircraft or the middle of big fields - Not that I'm suggesting this, mind you, but it worked here.

Only the 'prime' carnivors cross wide open spaces with impuny (generally) - in areas with lots of coyotes, there won't be any or many wolves. Watch for the coyotes to bugger off. Then, you've got problems.