Definition of "Historic Range" - The historic distribution represents the bird's maximum distribution from the early 1800's to the 1970s.
This map was enlarged to an 11 x 17 inch page with a photocopier. The enlarged map was then registered on a digitizer using county boundaries to define tics (rms error was 0.018) and the sage grouse range was digitized as depicted on the map.
This map was enlarged to an 11 x 17 inch page with a photocopier. The enlarged map was then registered on a digitizer using county boundaries to define tics (rms error was 0.018) and the sage grouse range was digitized as depicted on the map.
Eustace, C.D. December, 2000. Historical review of sage grouse in Montana. Unpublished report. Montana, Fish, Wildlife & Parks, 12 pp.
County polygons meeting the above criteria were pulled from the 1:100,000 scale County GIS layer available from the Natural Resource Information System, Montana State Library, Helena, MT or on line at <http://nris.state.mt.us>.
Eustace, C.D. December, 2000. Historical review of sage grouse in Montana. Unpublished report. Montana, Fish, Wildlife & Parks, 12 pp.
Carlson, J.C. and L. Oechsli. 1999. Avian habitat. Fish and Wildlife Management Program, Montana State University.
Saunders, A.A. 1912. Some birds of southwestern Montana. Condor 14:22-32.