Formal classifications of species.
- Sensitive: Species for which population viability is a concern. Sensitive species are not federally designated under the Endangered Species Act.
The U.S. Fish and Wildlife Service, after study, makes the following designations:
Candidate: Species under consideration for listing as endangered or threatened but for which conclusive data on biological vulnerability are not currently available to support listing. Also known as Category 2 species.Endangered: A species in danger of becoming extinct throughout all or a significant portion of its range.Threatened: A species likely to become endangered in the foreseeable future.Proposed: Those species named in formal documents published in the Federal Register under the direction of the Endangered Species Act and 50 CFR 402.2 but which have not yet been listed as endangered or threatened.