R.I. Gen. Laws § 20-2-35: Waterfowl stamp required.

No person sixteen (16) years of age or older shall take, or attempt to take, any migratory waterfowl without first obtaining a regular hunting license and a Rhode Island migratory waterfowl stamp for the current year. Each stamp shall be validated by the signature of the licensee written in ink across the face of the stamp and shall not be transferable. The stamp year shall run from July 1 to June 30. The migratory waterfowl stamp shall be available at all outlets currently used for the issuance of a hunting license.