I live in the city so we have tons of rats and mice living in our hedges here. Everynight I go out and there are tons of mice and rats eating my chickens feed and crawling around. We have been setting traps and usually catch at least one a night when we set them, and we have also tried using this sound thing that is supposed to repel rodents away, but when we were using it we would still catch rats in the traps so obviously it isn't working very well. What do you suggest I do? Would getting a feral cat help? I have my 2 house cats which go outside during the day but have to be in by night, and the rats don't come out during the day.