Definitions of; extirpated, endangered, threatened and special concerns

Extirpated: a species has become extinct in one area at least but still exists in other area(s)

Endangered: a species whose numbers are so small it is at risk ofbecoming extinct or extirpated if extensive measures to protect it are not undertaken

Threatened: a species that is likely to become endangered if not protected in some way

Special Concern: a species not endangered or thretened but extremely uncommon or has unique highly specific habitat