Put the pee at nighttime just by their decking all along - Decking is a haven for mice & rats to breed in general - the foxes are after the chickens .... keep large rat traps going to break their necks - they carry a disease that you can contract very dangerous .... bird food will attract rats too - put six rat traps per night down put the trap in a corner so it can't pinch the food/bait from the side & have to go after it full on too....There's hundreds, a few round here work away and have let their decking go, and others have time shares in the Canaries, some bellend has a parrot in his garden and god knows where he keeps the seed. Someone else had chickens for a bit. I'm surrounded by jerks. I hate them all so much.