Significantly Rare: Any species which has not been listed by the N.C.
Wildlife Resources Commission as an Endangered, Threatened, or Special
Concern species, but which exists in the state (or recently occurred in
the state) in small numbers and has been determined by the N.C. Natural
Heritage Program to need monitoring. (This is a N.C. Natural Heritage
Program designation.) Significantly Rare species include "peripheral"
species, whereby North Carolina lies at the periphery of the species'
range (such as Hermit Thrush), as well as species of historical occurrence
with some likelihood of re-discovery in the state. Species considered
extirpated in the state, with little likelihood of re-discovery, are given
no N.C. Status (unless already listed by the N.C. Wildlife Resources
Commission as E, T, or SC).
BirdLife International (2011) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 31/07/2011.