We are moving to a new farm with an existing chicken coop (there is another family on the farm who keep chickens), but the coop is infested with rats. The rats eat the chicken feed, but never harm the birds - in fact the other family says the chickens treat the rats like family and even once attacked a cat who was attacking one of the rats. This seems a bit odd, and I wonder at the very least about the rats transmitting intestinal parasites to the birds. Should I find a polite way of saying we'll be building our own (rat proof) coop, or should I send our ladies in with theirs?