My seven beautiful pullets were brutally killed last night by some nasty creature. I can't tell what it was because there were no tracks or hair. All of the chickens were dead this morning and either had their heads ripped off or their chests ripped open. I would like to know what you think it was. I have had the chickens since they were chicks (about 15 weeks) and have never had any problems before. I forgot to latch the lid of the coop last night and I think that is how IT got in. The coop is a 3 ft tall plywood box with a 4x4 sheet of plywood that hinges for the lid. I don't know what would be strong enough to open that. Please help me out!