Everything kills a chicken, those black snakes are not called "chicken" snakes as a joke....lol....i caught one on my porch last year, grabbed him and transported him down the road a mile, he was back the next week, so i killled him, once they find eggs, they will not stop. Raccoons are terrible also, since the fur industry has gone down the tubes, their population has gone out of control, if you have a raccoon problem, help out the environment and shoot them, if legal where you live. Fox, bobcats, and coyotes will all take an easy meal when they can, where i live you can take action to protect your livestock and it also helps control their populations which have also gone out of control. We can even kill hawks and owls if they are a problem and everyone knows they dont have anything preying on them. I guess it just comes down to what you can and cant live with.