I am sorry if this is not the right place for this question, but I was not sure where it would go. Outside of our coop and pasture, on the property line, a black walnut sapling is growing, and my neighbor is excited about it. I thought I remembered them being toxic to chickens. It is about 15 feet or so away from my pasture, and the coop is another 5 feet from the fence, but should I be worried? Is this tree going to harm my hens? We can not free range because we are rural and a fox is killing all of my neighbor's ducks, so the chickens will be in a chicken train when they are out and about. I could accidentally mow it over, if need be, but I want to keep peace, so if it will cause no harm, then I will let it grow.