hi all my bird Aviary is 10 mt x 4mt x 2.7mt high i have it covered with 12mm bird wire, yesterday went in aviary stood on a big rat body 200ml with tail 400mm big rat had to check to see if was dead good it was, picked it up with plastic bag put in waste bin, I have rat sack with peanut butter placed in two stations round back of bird shed they are eating it, good. my question is how could it be getting in I have 12mm bird wire on floor of breeding room works good, When I think about it I will have to get on my hands and knees and check all nooks and crannies, friend's any ideas would help big please.