RE: COYOYE DEN ERADICATION
If you already know where the den is toss some bleach down the hole followed by some ammonia , cover very quickly with a sheet of plastic with some branches to hold it down and get away from it . The two will combine to generate chlorine gas , DO NOT BREATHE THE VAPOR , which will kill all the pups and make the den unusable , the mother yote will take the hint and move on . Chlorine is highly toxic but it will gradually neutralize into harmless salts .