Boreal Owl
(Aegolius funereus)

Summary

Picture of bird
© Jukka Jantunen (flickr.com/photos/jukka_jantunen)
For additional photos and vocalizations, visit Dendroica. (Link opens in a new window.)

The Boreal Owl is widespread in forested regions across Canada. It is a year-round resident but may exhibit nomadic movements in search of prey. Christmas Bird Count results for a portion of the species' range indicate a large population increase in Canada relative to 1970, but these results are insufficient to establish the national population's status over the long-term. This species is therefore considered to be data deficient. The Boreal Owl may be susceptible to loss of mature forest habitat. This species has been identified as a priority for conservation and/or stewardship in one or more Bird Conservation Region Strategies in Canada.

Designations

Main designations for the species
DesignationStatusDateSubspecies, population
COSEWIC (Canada)Not at Risk1995 
IUCN (Global)Least concern2018 
Wild Species (Canada)Secure2015 
Bird Conservation Region StrategyPriority Species2013 

Population status

Geographic area or populationPopulation change relative to ~1970ReliabilityStatus in relation to goal
CanadaData DeficientData DeficientData Deficient
 

Population estimate

Geographic area or populationPopulation estimate
Canada50,000 - 500,000 adults
 

Distribution maps

 

Migration strategy, occurrence

Resident

Responsibility for conservation

Geographic areaResponsibility based on % of global population
CanadaModerate

General nesting period in Canada

Nesting period starts between mid-March and mid-April and ends in late July, depending on the region. Before or after this period, the probability of an active nest is lower.
 

Conservation and management

The lack of reliable population data on Boreal Owls makes it difficult to determine causes of population change and to make appropriate management decisions. Boreal Owls prefer mature forests with abundant snags and are therefore expected to be susceptible to habitat changes from forestry operations (Hayward and Hayward 1993). Timber harvest also influences the abundance of small-mammal prey and can reduce availability of suitable roosting habitat. Because succession can be quite lengthy in the boreal forest, clear-cut sites may not be useful as roosting/foraging sites for a century or more (Hayward and Hayward 1993). Increasing wildfire activity in the boreal forest may also be a concern for the Boreal Owl. Birds found breeding in early successional habitat after a burn had lower nestling survival (Anderson 2017).

 

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.

BCRs, marine biogeographic units, and sub-regions in which the species is listed as a priority
RegionSub-region and priority type
Atlantic Northern ForestsAtlantic Northern Forests, sub-region and priority type: Quebec -- Other
Boreal Hardwood TransitionBoreal Hardwood Transition, sub-region and priority type: Quebec -- Other
Boreal Softwood ShieldBoreal Softwood Shield, sub-region and priority type: Ontario -- Stewardship
Boreal Softwood ShieldBoreal Softwood Shield, sub-region and priority type: Quebec -- Stewardship
Boreal Taiga PlainsBoreal Taiga Plains, sub-region and priority type: Prairie and Northern -- Other
Northwestern Interior ForestNorthwestern Interior Forest, sub-region and priority type: Pacific and Yukon -- Stewardship
 

References