I can tell you now if you have coons in your area once they find your henhouse you will have a visit from them every night until your chicken are gone.
The only way you will prevent this is to have the whole thing covered in wire they can not get though or pull a chick through.
I had a large wire and wood cage I built with chicks in it and they would grab the chick nearest the wire through enough to kill it then chew what they wanted leaving the rest of the dead chick. You can not scare these critters off. You can scream at them beat on the wall at them throw water at them but they will just back off a few feet then come back as soon as you go inside. Eventually they figure out you are no real threat so just sit there looking at you looking like a dummy screaming your head off beating on the wall. You will have to kill the coons or you need to entirely seal the area with double walls of wire a chick cannot be pulled through.
BTW, If you plan to kill the coons make sure nothing is downrange from the target which you could hit. My house and car were always in the way plus if I had shot my gun someone in the area of all the new expensive houses would have called the police I am sure
