Great Horned Owl
(Bubo virginianus)

Overview

Summary

© Dan Busby
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This nocturnal predator ranges through all urban and rural wooded areas of Canada, but prefers open woodland and treed areas in agricultural lands. Though not an ideal survey for this species, available results from the Breeding Bird Survey suggest that Canadian populations of the Great Horned Owl have experienced a decrease in population relative to 1970. Historically, Great Horned Owls were commonly shot due to concerns for poultry predation. Despite being protected, some illegal shooting persists (Artuso et al. 2014).

Designations

Population status

Population estimate

Distribution maps

• BirdLife International / NatureServe
• Breeding Bird Survey (BBS): Relative Abundance and Breeding Distribution (1993-2012)

Migration strategy, occurrence

Responsibility for conservation of world population

Conservation and management

The species adapts to habitat change, as long as nest sites remain available. It appears to be relatively tolerant of disturbances at nest sites (Artuso et al. 2014). Nest sites are generally re-used nests of other stick nest builders (Artuso et al. 2014). Although very flexible in habitat choice, the Great-horned Owl prefers open woodlands and agricultural habitats (Artuso et al. 2014). Intensification of agricultural activities and subsequent reduction in availability of small mammalian prey may be related to the population decreases in some areas such as southern Ontario (Sleep 2007).

Bird conservation region strategies

Environment and Climate Change Canada and partners have developed Bird Conservation Region Strategies in each of Canada’s Bird Conservation Regions (BCRs). In these strategies, selected species are identified as priorities for one or more of the following reasons:

• conservation concerns (i.e., species vulnerable due to population size, distribution, population trend, abundance, or threats)
• stewardship responsibilities (i.e., species that typify the regional avifauna or have a large proportion of their range or population in the sub-region)
• management concerns (i.e., species that require ongoing management because of their socio-economic importance as game species, or because of their impacts on other species or habitats)
• other concerns (i.e., species deemed a priority by regional experts for other reasons than those listed above or because they are listed as species at risk or concern at the provincial level)

Select any of the sub-regions below to view the BCR strategy for additional details.

References

• Artuso, C., C. Stuart Houston, D.G. Smith and C. Rohner. 2014. Great Horned Owl (Bubo virginianus), The Birds of North America Online (A. Poole, Ed.). Cornell Lab of Ornithology, Ithaca, New York. Artuso, C., C. Stuart Houston, D.G. Smith and C. Rohner. 2014. Great Horned Owl (Bubo virginianus), The Birds of North America Online (A. Poole, Ed.). Cornell Lab of Ornithology, Ithaca, New York. (Link)
• Sleep, D.J.H. 2007. Great Horned Owl. pp. 292-293 in: Atlas of the Breeding Birds of Ontario, 2001-2005. Cadman, M.D., D.A. Sutherland, G.G. Beck, D. Lepage and A.R. Couturier, Eds. Bird Studies Canada, Environment Canada, Ontario Field Ornithologists, Ontario Ministry of Natural Resources, and Ontario Nature, Toronto, Ontario.