50 C.F.R. § 15.3
In addition to the definitions contained in parts 10 and 23 of this subchapter B, and unless the context requires otherwise, in this part:
Documentation means a description of how scientific information was collected, including the methodologies used; names and institutions of individuals conducting the work; dates and locations of any study; and any published results or reports from the work.
Exotic bird means any live or dead member of the Class Aves that is not indigenous to the 50 States or the District of Columbia, including any egg or offspring thereof, but does not include domestic poultry, dead sport-hunted birds, dead museum specimens, dead scientific specimens, products manufactured from such birds, or birds in any of the following families: Phasianidae. Numididae, Cracidae, Meleagrididae, Megapodiidae, Anatidae, Struthionidae Rheidae, Dromaiinae, and Gruidae.
Indigenous means a species that is naturally occurring, not introduced as a result of human activity, and that currently regularly inhabits or breeds in the 50 States or the District of Columbia.
Life cycle means the annual processes involved with breeding, migration, and all other non-breeding activities.
Person means an individual, corporation, partnership, trust, association, or any other private entity; or any officer, employee, agent, department, or instrumentality of the Federal Government, of any State, municipality, or political subdivision of a State, or of any foreign government; any State, municipality, or political subdivision of a State; or any other entity subject to the jurisdiction of the United States.
Species means any species, any subspecies, or any district population segment of a species or subspecies, and includes hybrids of any species or subspecies. Hybrids will be treated according to the more restrictive appendix or category in which either parental species is listed.
Status means a qualitative measure of the vulnerability to extinction or extirpation of a population at a given time (e.g., endangered, threatened, vulnerable, non-threatened, or insufficiently known).
Sustainable use means the use of a species in a manner and at a level such that populations of the species are maintained at biologically viable levels for the long term and involves a determination of the productive capacity of the species and its ecosystem, in order to ensure that utilization does not exceed those capacities or the ability of the population to reproduce, maintain itself and perform its role or function in its ecosystem.
Trend means a long-term assessment of any change in the absolute or relative size of a species' population or habitat over time (e.g., increasing, decreasing, at equilibrium, insufficiently known).
United States means the 50 States, the District of Columbia, the Commonwealth of Puerto Rico, American Samoa, the Virgin Islands, Guam, the Commonwealth of the Northern Mariana Islands, and the Trust Territory of the Pacific Islands.
50 C.F.R. §15.3