Under 39 U.S.C. 3015(a), any injurious animal, the importation or interstate shipment of which is prohibited pursuant to 18 U.S.C. 42, constitutes nonmailable matter.
Under 39 U.S.C. 3015(d), any fish, wildlife, or plant, the conveyance of which is prohibited pursuant to 16 U.S.C. 3372, constitutes nonmailable matter.
