Species: Aegolius funereus

Boreal Owl
Species
    Kingdom
    Animalia
    Phylum
    Craniata
    Class

    Aves

    Order

    Strigiformes

    Family

    Strigidae

    Genus

    Aegolius

    Classification
    Other Global Common Names
    nyctale de Tengmalm
    Informal Taxonomy
    Animals, Vertebrates - Birds - Other Birds
    Formal Taxonomy
    Animalia - Craniata - Aves - Strigiformes - Strigidae - Aegolius - Known as Tengmalm's Owl in European literature (AOU 1998).
    Short General Description
    A small owl
    Migration
    true - true - false - Periodic large-scale southward irruptions in North America, frequently in synchrony with similar movements of great gray and hawk-owl. Tends to occur at higher elevations in summer; may move to lower elevation for winter. In Colorado, some males remain at high elevations all year; others wander extensively (Johnsgard 1988).
    Non-migrant
    true
    Locally Migrant
    true
    Food Comments
    Eats mainly small mammals (often MICROTUS and CLETHRIONOMYS, also SOREX and PEROMYSCUS); also sometimes birds and insects (Bent 1938, Ryder et al. 1987, Hayward 1989).
    Reproduction Comments
    Female may occupy the nest cavity 1-3 weeks prior to egg laying (Hayward 1989). In Colorado, nests were initiated from mid-April to early June; mid-April to late May in Idaho (Hayward 1989). Clutch size usually is 4-6. Incubation reported as 25-36 days, by female. Young fledge at about 4-5 weeks, independent at 5-6 weeks, sexually mature by 1 year. Mating system variable. See Johnsgard (1988).
    Ecology Comments
    In Idaho, annual home range averaged 1528 ha (522-4119 ha); home ranges overlapped extensively; range was larger in winter than in summer; center of winter and summer ranges were separated by average of 2333 m (Hayward et al. 1987). Defends nest site only.
    Length
    25
    Weight
    167
    NatureServe Global Status Rank
    G5
    Global Status Last Reviewed
    1996-11-27
    Global Status Last Changed
    1996-11-27
    Conservation Status Map
    <img src="http://www.natureserve.org/explorer/servlet/GetMapGif?CA.AB=S4&CA.BC=S4&CA.LB=S3&CA.MB=S3&CA.NB=S1&CA.NF=S4&CA.NT=S4&CA.NS=S1&CA.NU=SNR&CA.ON=S4&CA.PE=__&CA.QC=S4&CA.SK=S3&CA.YT=S4&US.AK=S4&US.CO=S2&US.ID=S2&US.ME=__&US.MI=__&US.MN=SNR&US.MT=S4&US.NM=S2&US.NY=__&US.OR=S3&US.WA=S3&US.WI=__&US.WY=S2" alt="Conservation Status Map" style="width: 475px; height: auto;" />
    Global Range
    FH - 20,000 to >2,500,000 square km (about 8000 to >1,000,000 square miles) - FGH - Breeds in North America from treeline in central Alaska east to Newfoundland; south central Oregon in the Cascade and Blue Mountains, and in the Rocky Mountains south through Washington, Idaho, Montana, Wyoming, and Colorado to northern New Mexico; then east through central Saskatchewan, southern Manitoba, northern Minnesota, southern Quebec and Ontario. Breeds in Eurasia from treeline in northern Scandanavia, Russia, and Siberia, south in the mountians to southern Europe, the western Himalayas, and western China (AOU 1983, Hayward and Hayward 1993). Winters mainly in hte breeding range, however it may move south in the eastern U.S. and Europe during eruption years (A.O.U. 1983, Hayward and Hayward 1993).
    Global Range Code
    FH
    Global Range Description
    20,000 to >2,500,000 square km (about 8000 to >1,000,000 square miles)
    ELEMENT_GLOBAL.2.105053