Definitions: 

            State Endangered Species - An endangered species is a native species whose prospects of survival or recruitment within the state is in imminent
jeopardy.  This determination is based primarily upon the species status in  Oklahoma.

           State Threatened Species - A threatened species is a native species that,  although not presently in danger of extirpation, is likely to become endangered in the foreseeable future in the absence of special protection and management efforts.

             State Species of Special Concern - A special concern species may be one of the following:                       

                        Category I - A native species with a presently stable or increasing population that current evidence indicates is especially vulnerable to extirpation because of limited range, low population or other  factors.

                         Category II - A native species identified by technical experts as  possibly threatened or vulnerable to extirpation but for which little, if any, evidence exists to document the population level, range or other factors pertinent to its status.

US Fish and Wildlife Endangered Species Lists