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Montana Field Guides

Northern Saw-whet Owl - Aegolius acadicus

Native Species

Global Rank: G5
State Rank: S4
(see State Rank Reason below)


Agency Status
USFWS: MBTA
USFS:
BLM:
PIF:


 

External Links






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Copyright by Borror Laboratory of Bioacoustics, Department of Evolution, Ecology, and Organismal Biology, Ohio State University, Columbus, OH, all rights reserved.
State Rank Reason (see State Rank above)
Species is widely distributed in forested habitats. Population trend is unknown and it faces the threat loss of montane forest due to warming temperatures.
Northern Saw-whet Owl (Aegolius acadicus) Conservation Status Summary
State Rank: S4
Review Date = 11/04/2025
See the complete Conservation Status Rank Report
How we calculate Conservation Status Ranks
 
General Description
Round-headed, eyes yellow, bill black. Facial disk reddish/brown; forehead has short white vertical streaks. Ventrally reddish/brown streaking extends from neck to belly. Dorsally brown with white spots. Juvenile has dark reddish/brown facial disk and white forehead. Upper chest is reddish/brown grading into dark rust belly and flanks. Juveniles molt into adult-like plumage by early winter. SIZE: seven to eight inches. WEIGHT: three to four ounces. VOICE: A monotonous, "Toot, toot, toot," given rapidly and consistently throughout the night. Similar to one of the Northern Pygmy-Owl's calls.

For a comprehensive review of the conservation status, habitat use, and ecology of this and other Montana bird species, please see Marks et al. 2016, Birds of Montana.

Diagnostic Characteristics
Boreal Owls are slightly larger, have a yellow/white bill, rectangular head, whitish facial disk, and are darker brown overall with no reddish tinge.

Species Range
Montana Range Range Descriptions

All Ranges
Year-round
Winter
Migratory
(Click legend blocks to view individual ranges)

Western Hemisphere Range

 


Observations in Montana Natural Heritage Program Database
Number of Observations: 1543

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

SUMMER (Feb 16 - Dec 14)
Direct Evidence of Breeding

Indirect Evidence of Breeding

No Evidence of Breeding

WINTER (Dec 15 - Feb 15)
Regularly Observed

Not Regularly Observed


 

(Observations spanning multiple months or years are excluded from time charts)



Migration
Migratory although some birds may remain throughout winter.

Habitat
Most common in coniferous forests; however, they can be found in deciduous trees along watercourses.

National Vegetation Classification System Groups Associated with this Species
Forest and Woodland
Deciduous Forest and Woodland
Low Elevation - Xeric Forest and Woodland
Montane - Subalpine Forest and Woodland
Shrubland
Foothills - Montane Shrubland
Grassland
Montane - Subalpine Grassland
Wetland and Riparian
Alpine Riparian and Wetland
Riparian and Wetland Forest
Riparian Shrubland
Wet Meadow and Marsh
Recently Disturbed or Modified
Harvested Forest
Insect-Killed Forest
Recently Burned

Food Habits
Predominately small mice, although small birds and insects are probably also eaten.

Reproductive Characteristics
Begins nesting in April. Nests in woodpecker holes and possibly natural cavities. Clutch size four to six. Incubation approximately 30 days. Young just out of nest reported on May 29 and July 12. Egg dates probably similar to Alberta: April 18 to June 8.


References
  • Literature Cited AboveLegend:   View Online Publication
    • Marks, J.S., P. Hendricks, and D. Casey. 2016. Birds of Montana. Arrington, VA. Buteo Books. 659 pages.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • American Ornithologists’ Union [AOU]. 1998. Check-list of North American birds, 7th edition. American Ornithologists’ Union, Washington, D.C. 829 p.
    • Anaconda Minerals Company, and Camp, Dresser & McKee. 1981. Anaconda Stillwater Project 6-month environmental baseline report. CDM Project No. 3139. Vol. I Appendix. Jan. 15, 1981.
    • Brelsford, M. 1992. Boreal owl (Aegolius funereus) and flammulated owl (Otus flammeolus) survey results for the Bozeman district of the Gallatin National Forest. Unpublished report to the Gallatin National Forest by the Montana Natural Heritage Program, Helena, MT. 20 pp.
    • Brelsford, M. 1992. Boreal owl (Aegolius funereus) and flammulated owl (Otus flammeolus) survey results for the Livingston district of the Gallatin National Forest. Unpublished report to the Gallatin National Forest by the Montana Natural Heritage Program, Helena, MT. 22 pp.
    • Call, M.W. 1979. Habitat management guides for birds of prey. Technical Note 338. Denver, CO: USDI Bureau of Land Management. 70 p.
    • Cameron, E. S. 1908. The birds of Custer and Dawson counties, Montana. Auk 25:39-56.
    • Cannings, R. J. 1987. The breeding biology of northern saw-whet owls in southern British Columbia. Pp. 193-198. in: Nero, R.W., et al., (eds). Biology and conservation of northern forest owls. USDA For. Serv., Gen. Tech. Rep. RM-142.
    • Cannings, R.J. 1993. Northern Saw-whet Owl (Aegolius acadicus). Species Account Number 042. The Birds of North America Online (A. Poole, Ed.). Ithaca, NY: Cornell Laboratory of Ornithology; Retrieved 3/25/2008 from The Birds of North America Online database
    • Carlson, J. 1991. Results of boreal owl surveys on the Jefferson Division of the Lewis & Clark National Forest. Montana Natural Heritage Program, Helena, MT. 33 pp.
    • Decker Coal Co., 1981, Wildlife survey. July 7, 1981. In North Decker 5-Year Permit Application. Vol. III. Rule 26.4.304(12-14).
    • Ehrlich, P., D. Dobkin, and D. Wheye. 1988. The birder’s handbook: a field guide to the natural history of North American birds. Simon and Schuster Inc. New York. 785 pp.
    • Farmer, Patrick J., and Thomas W. Butts, Western Technology & Eng., Inc., Helena, MT., 1994, McDonald Project Terrestrial Wildlife Study, November 1989 - November 1993. April 1994. In McDonald Gold Project: Wildlife & Fisheries. [#18]. Seven-up Pete Joint Venture, Lincoln, MT. Unpub. No date.
    • Hays, R., R.L. Eng, and C.V. Davis (preparers). 1984. A list of Montana birds. Helena, MT: MT Dept. of Fish, Wildlife & Parks.
    • Hayward, G.D. and E.O. Garton. 1988. Resource partitioning among forest owls in the River of No Return Wilderness, Idaho. Oecologia 75:253-265.
    • Hejl, S.J., R.L. Hutto, C.R. Preston, and D.M. Finch. 1995. The effects of silvicultural treatments on forest birds in the Rocky Mountains. pp. 220-244 In: T.E. Martin and D.M. Finch (eds). Ecology and Management of Neotropical Migratory Birds. New York, NY: Oxford Univ. Press. 489 p.
    • Hendricks, P. 2005. Surveys for animal species of concern in northwestern Montana. Unpublished report to the Montana Department of Fish, Wildlife & Parks, Montana Natural Heritage Program, Helena, Montana, May 2005. 53 p.
    • Holt, D. W., and L. A. Leroux. 1996. Diets of Northern Pygmy-Owls and Northern Saw-whet Owls in west-central Montana. Wilson Bulletin 108(1):123-128.
    • Johnsgard, P.A. 1992. Birds of the Rocky Mountains with particular reference to national parks in the northern Rocky Mountain region. Lincoln: University of Nebraska Press. xi + 504 pp.
    • Joslin, Gayle, and Heidi B. Youmans. 1999. Effects of recreation on Rocky Mountain wildlife: a review for Montana. [Montana]: Montana Chapter of the Wildlife Society.
    • Lenard, S., J. Carlson, J. Ellis, C. Jones, and C. Tilly. 2003. P. D. Skaar's Montana bird distribution, 6th edition. Montana Audubon, Helena, MT. 144 pp.
    • Lockhart, J. Michael, 1976, Effects of coal extraction and related development on wildlife populations. Annual progress report; Calendar year 1976. In Decker Coal Company West Pit Permit. Vol. 3. 26.4.304(10-11), 305, 306, and 307. Updated Rules Rewrite, July 1, 1991. Appendix F.
    • Marks, J.S. and J.H. Doremus. 1988. Breeding-season diet of Northern Saw-whet Owls in southwestern Idaho. Wilson Bull. 100:690-694.
    • Maxell, B.A. 2016. Flammulated Owl surveys on the Big Timber, Bozeman, Gardiner and Livingston Ranger Districts of the Custer Gallatin National Forest: 2013. Report to Custer Gallatin National Forest. Montana Natural Heritage Program. Helena, MT. 27pp + appendices.
    • Montana Bird Distribution Committee. 2012. P.D. Skaar's Montana bird distribution. 7th Edition. Montana Audubon, Helena, Montana. 208 pp. + foldout map.
    • MT Fish, Wildlife & Parks. No date. Blackfoot-Clearwater Wildlife Management Area checklist.
    • Mullen, P.D. 1990. Status report on boreal owl surveys in southwestern Montana, 1989. Montana Natural Heritage Program, Helena, MT. 16 p. + Appendices
    • OEA Research, Helena, MT., 1982, Beal Mine Wildlife Report. June 17, 1982.
    • Oechsli, L.M. 2000. Ex-urban development in the Rocky Mountain West: consequences for native vegetation, wildlife diversity, and land-use planning in Big Sky, Montana. M.Sc. Thesis. Montana State University, Bozeman. 73 p.
    • Palmer, D. A. 1987. Annual, seasonal, and nightly variation in calling activity of boreal and northern saw-whet owls. Pp. 162-168 in Nero, R.W., et al., eds. Biol. & Cons. of n. forest owls. U.S. For. Serv., Gen. Tech Rep. RM-142.
    • Palmer, D.A. 1986. Habitat selection, movements and activity of Boreal and Saw-whet Owls. M.S. thesis, Colo. State Univ., Fort Collins. 101 pp.
    • Phillips, R.L., A.H. Wheeler, N.C. Forrester, J.M. Lockhart, and T.P. McEneaney. 1990. Nesting ecology of golden eagles and other raptors in southeastern Montana and northern Wyoming. U.S. Fish Wildl. Serv. Tech. Rep. 26:1-13.
    • Ralph, J.C., J.R. Sauer, and S. Droege. 1995. Monitoring bird populations by point counts. Gen. Tech. Rep. PSW-GTR-149. Albany, CA: USDA Pacific Southwest Research Station. 181 p.
    • Rogers, Ralph R. 1998. A Survey of Forest-Dwelling Owls in the Judith Resource Area of Central Montana. A Report for the USDI BLM Judith Resource Area. 10 pp + tables.
    • Sibley, D. 2014. The Sibley guide to birds. Alfred A. Knopf, New York, NY. 598 pp.
    • Skaar, P. D., D. L. Flath, and L. S. Thompson. 1985. Montana bird distribution. Montana Academy of Sciences Monograph 3(44): ii-69.
    • Skaar, P.D. 1969. Birds of the Bozeman latilong: a compilation of data concerning the birds which occur between 45 and 46 N. latitude and 111 and 112 W. longitude, with current lists for Idaho, Montana, Wyoming, impinging Montana counties and Yellowstone National Park. Bozeman, MT. 132 p.
    • Thompson, Richard W., Western Resource Dev. Corp., Boulder, CO., 1996, Wildlife baseline report for the Montana [Montanore] Project, Lincoln and Sanders counties, Montana. In Application for a Hard Rock Operating Permit and Proposed Plan of Operation, Montanore Project, Lincoln and Sanders Counties, Montana. Vol. 5. Stroiazzo, John. Noranda Minerals Corp., Libby, MT. Revised September 1996.
    • U.S. Forest Service. 1991. Forest and rangeland birds of the United States: Natural history and habitat use. U.S. Department of Agriculture, Forest Service Agricultural Handbook 688. 625 pages.
    • Waage, Bruce C., 1996, Western Energy Company Rosebud Mine, Colstrip, Montana: 1995 Annual Wildlife Monitoring Report; December 1, 1994 - November 30, 1995. February 28, 1996.
    • Waage, Bruce C., 1999, Western Energy Company Rosebud Mine, Colstrip, Montana: 1998 Annual Wildlife Monitoring Report; December 1, 1997 - November 30, 1998 Survey Period. February 24, 1999.
    • Walcheck, K.C. 1970. Nesting bird ecology of four plant communities in the Missouri River Breaks, Montana. Wilson Bulletin 82(4):370-382.
    • Waldt, R. 1995. The Pine Butte Swamp Preserve bird list. Choteau, MT: The Nature Conservancy. Updated August 1995.
    • Watts, C.R. and L.C. Eichhorn. 1981. Changes in the birds of central Montana. Proceedings of the Montana Academy of Sciences 40:31-40.
    • Westmoreland Resources, Inc., Hardin, MT., 1981, 1981 Wildlife Report. April 1982.
    • Zackheim, K. 1973. Exhibit H: Wildlife Study. In Ash Grove Cement Co. files.
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Northern Saw-whet Owl — Aegolius acadicus.  Montana Field Guide.  .  Retrieved on , from