i haven't lost a chicken to a predator in my 3 years of urban ranching. I do have plenty of predators around, but have been delegent about locking them up and having a secure run. Sometimes I allow them to run about in the last minutes of daylight. Last night, the old hens locked up, I went back in the house awhile since the pullets were still in my wife's flowers and not ready to go in. Just after dark I went to lock the house and a racoon came running out from the house. It wasn't a full grown one and appeared to be eating feed. I don't know if it was unaware of the chickens just above its head, but they were certainly aware of it.