[Code of Federal Regulations]
[Title 50, Volume 2]
[Revised as of October 1, 2006]
From the U.S. Government Printing Office via GPO Access
[CITE: 50CFR17.83]

[Page 156]
 
                    TITLE 50--WILDLIFE AND FISHERIES
 
 CHAPTER I--UNITED STATES FISH AND WILDLIFE SERVICE, DEPARTMENT OF THE 
                          INTERIOR (CONTINUED)
 
PART 17_ENDANGERED AND THREATENED WILDLIFE AND PLANTS--Table of Contents
 
                   Subpart H_Experimental Populations
 
Sec.  17.83  Interagency cooperation.

    (a) Any experimental population designated for a listed species (1) 
determined pursuant to Sec.  17.81(c)(2) of this subpart not to be 
essential to the survival of that species and (2) not occurring within 
the National Park System or the National Wildlife Refuge System, shall 
be treated for purposes of section 7 (other than subsection (a)(1) 
thereof) as a species proposed to be listed under the Act as a 
threatened species.
    (b) Any experimental population designated for a listed species that 
either (1) has been determined pursuant to Sec.  17.81(c)(2) of this 
subpart to be essential to the survival of that species, of (2) occurs 
within the National Park System or the National Wildlife Refuge System 
as now or hereafter constituted, shall be treated for purposes of 
section 7 of the Act as a threatened species. Notwithstanding the 
foregoing, any biological opinion prepared pursuant to section 7(b) of 
the Act and any agency determination made pursuant to section 7(a) of 
the Act shall consider any experimental and nonexperimental populations 
to constitute a single listed species for the purposes of conducting the 
analyses under such sections.