Raptors and the Law
below are various government resources that identify
laws relating to wild raptors and wildlife
On possession of live raptors, eggs, feathers, nests and unpermitted rehabilitation:
"The Migratory Bird Treaty Act makes it illegal for anyone to take, possess, import, export, transport, sell, purchase, barter, or offer for sale, purchase, or barter, any migratory bird, or the parts, nests, or eggs of such a bird except under the terms of a valid permit issued pursuant to Federal regulations."
On removing nests:
"Under the MBTA it is illegal to destroy a nest that has eggs or chicks in it or if there are young birds that are still dependent on the nest for survival. It is also illegal for anyone to keep a nest they take out of a tree or find on the ground unless they have a permit issued by the U.S. Fish and Wildlife Service (USFWS)."
"A federal depredation permit authorizes you to capture or kill birds to reduce damage caused by birds or to protect other interests such as human health and safety or personal property. A depredation permit is intended to provide short-term relief for bird damage until long-term, non-lethal measures can be implemented to eliminate or significantly reduce the problem."
"MBTA violations involving the taking, possession, transportation or other unlawful utilization of migratory birds including permit regulations are misdemeanors, punishable by a fine of up to $15,000 and/or up to six months imprisonment, and revocation of permits (if applicable). The sale or barter of migratory birds is a felony punishable by a fine of up to $250,000 (500,000 per organization) and/or up to two years in prison."
In order to perform any sort of taxidermy, commercial or otherwise, you must have a federal permit. If you are attempting to mount a migratory bird for another party you must both have the requisite permits.