We have a storage building with an adjoining chicken coop. It is predator proof, but occasionally they are out about in the yard to free range, and I can't say that we ALWAYS remember to lock them up at night. The storage building has a family of mice living under it, and I really don't want to lay out poison, knowing they might around the yard... poisoning other animals, or my one year old! So I thought about getting a cat, but of course, that means that he/she might bother my chickens and/or their hatchlings. Any other suggestions?