The Migratory Bird Treaty Act prohibits the take, possession, transportation, or sale of migratory birds without a permit. This includes any migratory bird; any part, nests, or eggs; or any product. The migratory bird species protected are listed in 50 CFR 10.13. The FWS is authorized to issue permits for the take, possession, transportation, or sale of migratory birds when compatible with the four Conventions. This includes scientific, exhibition, breeding, depredation, and Native American purposes. The regulations authorizing permits for migratory birds are in 50 CFR Part 21.