i don't think its possible to kill 70% of the coyotes in any area.the adult females will have large litters just like any large breed of domestic dog.for 100 years man has tryed to aradicate the coyote,putting a bounty on them,open seasons,poisoning them and a shoot one shoot them all attitude,it didn't work.the coyote will not be alimanated from this planet.i'm not sure what percentage can be harvested but 70% is very high.