I bought some green square just one bite bars at our hardware store. They were very hard and had a hole in the middle where you can screw them to a post. They ate them and died til a raccoon came and broke them loose and stole them. Dont know if it killed the raccoon and while i realize its illegal to poison wildlife, i sure as heck did not tell the coon go get it. I guess you know you have a pest problem when you have to put up electric fence to keep out the raccoons so you can poison the rats. And they say farming is the simple life...