Population status

Boreal Owl
(Aegolius funereus)

The Boreal Owl is not well monitored in Canada. Christmas Bird Count (CBC) results suggest a 900% increase in the abundance of Boreal Owls relative to about 1970, but the potential for bias in this trend estimate is substantial because only six count circles were included in the analysis, CBC methods are not highly standardized, and targeted efforts to record owls may have increased over time. Assessment of the species' population status is further complicated by its nomadism and response to fluctuating prey populations (Hayward and Hayward 1993). The species is therefore considered data deficient. Future assessments of status will be improved when regional Nocturnal Owl Surveys become more widespread and amass a longer time-series. Because of the lack of information, a national population goal for the Boreal Owl has not yet been determined.


Population goal and acceptable levels of variation

Species/groupGoalLower levelUpper level
Boreal OwlTo be determinedTo be determinedNot applicable

Picture of logo Christmas Bird Count (CBC)

Additional information on: Christmas Bird Count (CBC)

Table 1: Population trends by geographic area
Geographic areaTime PeriodAnnual Trend Table 1 - footnote 1 Limits
Canada Select to view graph of the geographic area: Canada 1970-2016; Christmas Bird Count (CBC)1970-20165.2-0.310.4