. The Canadian field-naturalist. 1976 Notes 477 First Boreal Owl Nest for Ontario, with Notes on Development of the Young The Boreal Owl, Aegolius funereus richardsoni, is mainly confined to the boreal forest (Godfrey 1966) which in Ontario lies north of Lake Superior. At irregular intervals during late winter Boreal Owls move south of their normal range; such movements have been termed irruptions (Catling 1972). They have occurred in Saskatchewan (Houston 1960; Anweiler 1960), Minnesota (Green 1966, 1969), and southern Ontario (Catling 1972). The last author has summarized the five known irru
. The Canadian field-naturalist. 1976 Notes 477 First Boreal Owl Nest for Ontario, with Notes on Development of the Young The Boreal Owl, Aegolius funereus richardsoni, is mainly confined to the boreal forest (Godfrey 1966) which in Ontario lies north of Lake Superior. At irregular intervals during late winter Boreal Owls move south of their normal range; such movements have been termed irruptions (Catling 1972). They have occurred in Saskatchewan (Houston 1960; Anweiler 1960), Minnesota (Green 1966, 1969), and southern Ontario (Catling 1972). The last author has summarized the five known irruptions since 1920 in southern Ontario and deals at length with the 1968-69 invasion. In addition to these invasions single Boreal Owls are seen occasionally in southern Ontario at 4- or 5-year intervals (Fleming 1907, 1913; Eifrig 1907; Soper 1923; Calvert 1925; Lloyd 1932; Saunders 1937). Individual birds have been recorded as far south as Long Island, New York (Buckley and Kane 1975). The few nests of this species documented at the National Museum of Natural Science in Ottawa for North America are as follows: northern British Columbia, 1; Alberta, 9; Saskatchewan, 1; Manitoba, 4; Northwest Territories, 1; Alaska, several; Nova Scotia, 3; and Labrador, 1. Until 1975 none was known for Ontario. In the spring and summer of 1974 and 1975 (26 March - 26 July 1974 and 19 March - 8 June 1975) I studied vocalizations and habitat selection of the Boreal Owl in northern Ontario. My study area was 60 km WSW of Kapuskasing in boreal forest type B4 (Rowe 1972). This area is typically composed of mature black spruce (Picea mariana), white spruce (P. glauca), balsam fir (Abies balsamed), balsam poplar (Populus balsamifera), trembling aspen {P. tremu- loides), and white birch {Betula papyrifera). The Nest I located five prospective nest sites; three by observing males attracting females to nest cavities and two by finding the female in the nest. All were in trembling aspen, four in live tree
Size: 1382px × 1808px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorottawafieldnaturalistsclub, bookcentury1900, bookcolle
