About Us | Frequently Asked Questions | Species Status Codes

A series of codes has been developed to identify the current status of each listed species in our endangered species database. See below for descriptions of some of the more commonly used codes.

E = endangered. A species "in danger of extinction throughout all or a significant portion of its range."

T = threatened. A species "likely to become endangered within the foreseeable future throughout all or a significant portion of its range."

C = candidate. A species under consideration for official listing for which there is sufficient information to support listing.

SAE, E(S/A) = endangered due to similarity of appearance. A species that is endangered due to similarity of appearance with another listed species and is listed for its protection. Species listed as E(S/A) are not biologically endangered or threatened and are not subject to Section 7 consultation.

SAT, T(S/A) = threatened due to similarity of appearance. A species that is threatened due to similarity of appearance with another listed species and is listed for its protection. Species listed as T(S/A) are not biologically endangered or threatened and are not subject to Section 7 consultation.

EXPE, XE = experimental essential population. A species listed as experimental and essential. EXPN, XN = experimental non-essential population. A species listed as experimental and non-essential. Experimental, nonessential populations of endangered species (e.g., red wolf) are treated as threatened species on public land, for consultation purposes, and as species proposed for listing on private land.

PE = proposed endangered. Species proposed for official listing as endangered.

PT = proposed threatened. Species proposed for official listing as threatened.

PEXPE, PXE = proposed experimental population, essential. Species proposed for official listing as experimental and essential.

PEXPN, PXN = proposed experimental population, non-essential. Species proposed for official listing as experimental and non-essential.

PSAE, PE (S/A) = proposed endangered, due to similarity of appearance. Species proposed for official listing as endangered due to similarity of appearance with another listed species.

PSAT, PT (S/A) = proposed threatened, due to similarity of appearance. Species proposed for official listing as threatened due to similarity of appearance with another listed species.

Emergency Endangered - A temporary (240 days) listing for emergency purposes when species is at significant, immediate risk.

Delisted - Species that has been removed from the list due to recovery, original data in error, or extinction.

Species of Concern (SC) - Species that have not been petitioned or been given E, T, or C status but have been identified as important to monitor.

Resolved Taxon (RT) - Species that have been petitioned for listing and for which a Not Warranted 12 month finding or Not Substantial 90-day finding has been published in the Federal Register. Also includes species that have been removed from the candidate list.

Under Review (UR) - Species that have been petitioned for listing and for which a 90 day finding has not been published or for which a 90 day substantial has been published but a 12 Month finding have not yet been published in the Federal Register. Also includes species that are being reviewed through the candidate process, but the CNOR has not yet been signed.