Every farm has some, I get a few because of my open loft mob, some have a couple of days feeding and move on others stay longer, I had a Ch. Pd. hen here for 18 months, never came in, roosted on a ledge outside the whole time until two Dk. Ch. cocks arrived, they stayed for two days and the next morning they were gone and so was the hen, If she got home she would have looked in good nick and the owner could well have believed she'd been in somewhere