Mont. Code Ann. § 87-3-114

All shippers of fish, game or nongame birds, game animals, fur-bearing animals, the skins of fur-bearing animals or predatory animals, or parts thereof are required to label all packages offered for shipment by parcel post, common carrier, or otherwise. The label shall be securely attached to the address of the package and shall plainly indicate the names and addresses of the consignor and consignee and the complete contents of the package.