I came home to give the girls a treat and check on them and I notice they were sqwalking like a predator was near but not like they were TOO alarmed, kind of like I was disturbing them but I noticed my Cochin was outside of the coop looking inside a little, and so I looked in to find a big mouse inside. I tried to open up the egg door but it ran out the other door. Our coop was built by a woman and child using free materials, and the door I have on it doesn't close all the way so it could still get in. What do I do??? I'm scared to use poisons just in case they get ahold of it...do I buy a bunch of bricks and then jack up the coop???