Commercial means related to the offering for sale or resale, purchase, trade, barter, or the actual or intended transfer in the pursuit of gain or profit, of any item of wildlife and includes the use of any wildlife article as an exhibit for the purpose of soliciting sales, without regard to quantity or weight. There is a presumption that eight or more similar unused items are for commercial use. The Service or the importer/exporter/owner may rebut this presumption based upon the particular facts and circumstances of each case.
50 CFR § 14.4
In addition to definitions contained in part 10 of this subchapter, in this part: