Abstract: A device and coupling for producing erratic, random motion in decoys to attract wildlife, which device includes an erratic motion-generating device characterized by an electric motor that causes a flexible arm extending from the motor to move in an erratic, random motion and facilitate lifelike movement of a decoy body mounted on the flexible arm by means of a typically tubular coupling. Various decoy bodies or “shells”, including goose, turkey and duck decoy shells, are adapted for mounting on hollow tubes and inserts of various length fitted on the flexible arm to facilitate the desired erratic and random motion of the decoy shells. The erratic motion device can be constructed and programmed to produce a wide variety of erratic, random and unpredictable movement in the removable decoy shells for attracting the wildlife.