rodent keep coming back

Asked August 1, 2016, 9:31 PM EDT

found two rodent holes two weeks ago,filled the holes with water,than rat poison,than stuff steel wool into each hole cover with dirt. these holes were going under our concert patio. Yesterday(07312016) founded a new hole, have search for another no luck in finding a second hole.I have left it along to see if its being used a nest left some torn paper outside not far from the hole. I have cut down all flowers and plants,will do it again they are growing back. My question? why do the rat keep coming back, no dog poop, no water,I have even destroyed what little veggie I had growing in pots. Why my yard? Oh, the holes are getting closer, and closer to our door.

Wayne County Michigan

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