yeah I figured raccoon. I don't know if my dogs would take down a raccoon. I think they would, but they are in the house at night. I haven't had anything mess with the big chickens but I just put the babies outside. I kept them in the run attached to the coop. I just wasn't careful last night. I want to try the lights, but I don't like throwing my money away. LOLI don't think the red lights would work or we would all have them. Any lights at all would deter them, but only a secure coop or a good dog will keep them out. I'm pretty convinced the only reason I haven't had to deal with them yet is because I have big dogs that have free run of the property and have taken down raccoons and opossums regularly.
I'm sorry about your chookie. If it was grabbed through the gate, it was most likely a raccoon.