Rats keep getting into my chicken pen even though it's indoors and on concrete. They have killed three Rhode Island red pullets about 12 weeks old. When will the chickens be able to defend themselves because right now I've been locking them up at night but its getting harder as they get bigger. Their boxes are off the ground. It's getting really annoying we put rat poison down but they still seem to be around or coming from neighbors property. They have chewed a hole into my goat pen to but haven't done anything to the goats but the goats are all hopefully pregnant so I don't know if they would try to attack a baby too. Any advice is helpful.