The wife brought home 6 baby chicks back in March. She had been threatening to do so for years. We still have 5 of them. I built a Villa for them (about 24 square feet with lots of perch poles throughout) and a 12X24 fenced in area that I have as yet not enclosed completely (The top isn't done yet but the walls and gate are done). Well anyway, this evening I thought I saw a cat climbing the fence (bad news I'm sure) and as got closer I realized it was a possum. I ran it off for now but I'm sure it will be back We don't have any eggs yet so that isn't a concern but possums are pretty vicious creatures. Are they a threat to the chickens ? Originally we were locking them in the coop at night but for the last couple of nights we have been leaving the coop doors open. We are brand new to this forum and any assistance will be greatly appreciated.