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Great Gray Owl, Alan E. Burger
Photo © Alan E. Burger

Photo: Alan E. Burger
Breeding evidence - Great Gray Owl
Breeding evidence

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Great Gray Owl
Strix nebulosa

Click on plot to view table of mean abundance
Elevation range:
605 - 1399 m
Conserv. status:
Not at risk
Global importance
of B.C. population:
7
Number of squares
ConfirmedProbablePossiblePoint counts
19 21 71 5
Long-term BBS trends
RegionYearsTrend (conf. interv.) Reliab.
BBS trends are not available for this species

Mean abundance by region

Bird Conservation Regions [plot]
NW Interior ForestBoreal Taiga PlainsGreat BasinNorthern RockiesN. Pacific Rainforest
    0.11  
Ecoprovinces [plot]
N. Boreal Mountains Taiga Plains Boreal Plains Georgia Depression Sub-Boreal Interior
      0.12
S. Interior Mountains Central Interior Southern Interior S. Alaska Mountains Coast & Mountains
 0.08     

Mean abundance by habitat [plot]

Boreal Altai Fescue AlpineBoreal White and Black SpruceBunchgrassCoastal Douglas-fir
 0.07  
Coastal Mountain-heather AlpineCoastal Western HemlockEngelmann Spruce -- Subalpine FirInterior Cedar -- Hemlock
    
Interior Douglas-firInterior Mountain-heather AlpineMontane SpruceMountain Hemlock
    
Ponderosa PineSpruce -- Willow -- BirchSub-Boreal Pine -- SpruceSub-Boreal Spruce
  0.070.14

Characteristics and Range The Great Gray Owl is the largest owl in British Columbia in linear dimensions (the Great Horned and Snowy owls are heavier); its huge, dinner-plate face and white bow-tie are distinctive. The large facial discs act as very sensitive external ears; Great Grays can locate and capture voles under a deep snow pack or pocket-gophers just below the surface of the ground. These are birds of the world's vast boreal forests, in North America occurring from Alaska to the Great Lakes and south in the western cordilleras to northern California and northwestern Wyoming (Bull and Duncan 1993).

Distribution, Abundance, and Habitat The Great Gray Owl is resident throughout the interior of British Columbia; during the Atlas it was found in in only one square in the Coast and Mountains ecoprovince (on the western edge of the Chilcotin Plateau) and was totally absent from the Georgia Depression. The distribution of Atlas sightings was very similar to those reported in The Birds of British Columbia when published in 1990, although the Atlas filled in gaps in the Northern Boreal Mountains ecoprovince. It is generally found at mid-elevations, from 500 m to 1250 m. Sightings were too few to generate a Probability of Observation model or make abundance comparisons.

Great Gray Owls breed in coniferous and mixed forests, usually near openings such as marshes, muskegs, meadows or pasture (Campbell et al. 1990). Forest types include Douglas-fir (Pseudotsuga menziesii), Trembling Aspen (Populus trichocarpa, Lodgepole Pine (Pinus contorta), Western Larch (Larix occidentalis) and spruce (Picea) species. Nests are usually placed in old hawk nests or on witch's broom clumps in spruce trees (Campbell et al. 1990). Primary prey species are voles (Microtus, Clethrionomys species) and pocket gophers (Thomomys talpoides).

Conservation and Recommendations The Great Gray Owl population in Canada is considered stable overall, with periodic fluctuations that track prey abundance (Environment Canada 2011). The primary threat to its habitat is clearcut logging, which removes roosting and nesting habitat, and often provides few or no perches for hunting (Bull and Duncan 1993).

Richard J. Cannings

Recommended citation: Cannings, R.J. 2015. Great Gray Owl in Davidson, P.J.A., R.J. Cannings, A.R. Couturier, D. Lepage, and C.M. Di Corrado (eds.). The Atlas of the Breeding Birds of British Columbia, 2008-2012. Bird Studies Canada. Delta, B.C. http://www.birdatlas.bc.ca/accounts/speciesaccount.jsp?sp=GGOW&lang=en [11 Dec 2018]

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