All guns, traps, teams, horses, or means of transportation of every nature or description used by any person or persons within the limits of said parks, or either of them, when engaged in killing, trapping, ensnaring, or capturing such wild beasts, birds, or animals, shall be forfeited to the United States and may be seized by the officers in said parks, or either of them, and held pending prosecution of any person or persons arrested under the charge of violating the provisions of sections 57, 58, and 60 to 65 of this title, and upon conviction such forfeiture shall be adjudicated as a penalty in addition to the other punishment prescribed therein. Such forfeited property shall be disposed of and accounted for by and under the authority of the Secretary of the Interior.