Postal Explorer > Publication 52 - Hazardous, Restricted, and Perishable Mail > 5 Perishable Matter > 57 Nonmailable Plant Pests, Injurious Animals, andIllegally Taken Fish or Wildlife > 572 Criminal Penalties
Criminal penalties are specified in 18 U.S.C. 1716d for mailing anything that is nonmailable under 39 U.S.C. 3015(a), (b), or (d).