Breeds in coniferous and mixed-coniferous forests with highest densities occurring in coniferous forests at moderate elevations. Nests in Northern Flicker or natural cavities in snags, but will use nest boxes. Favors mature and old-growth stands. Dense forests important for roosting (Cannings 1993). In B.C., nonbreeding birds are found in a variety of habitats, including pure and mixed coniferous and deciduous thickets, dense forests, woodlands, and among tall shrubs (Campbell et al. 1990).
Campbell, R. W., N. K. Dawe, I. McTaggart-Cowan, J. M. Cooper, G. W. Kaiser, and M. C. E. McNall. 1990. The Birds of British Columbia. Vol. 1 and 2, Nonpasserines. UBC Press, Vancouver, B.C.
Cannings, R. J. 1993. Northern Saw-whet Owl (Aegolius acadicus). In The Birds of North America. Vol. 7, No. 42 (A. Poole and F. Gill, Eds.). Philadelphia: The Academy of Natural Sciences; Washington, D.C.: The American Ornithologists’ Union.