Is there any type of icemelt that is safe around chickens who are free ranging? We have been using cat litter, which doesn't work too well, turns into a muddy mess, it seems like, anyway. I am worried anything else we put down they might eat, and it would be toxic. I suppose I could use cracked corn to provide some traction on ice....They would eat that, too but at least it's edible. Any other ideas?