5300 x 3613 px | 44,9 x 30,6 cm | 17,7 x 12 inches | 300dpi
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Boreal Owl Aegolius funereus Churchill Manitoba CANADA June Strigidae A small owl of boreal and mountain forests, the Boreal Owl is found in Alaska and Canada, and circles the North Pole across Eurasia. In the lower 48 states, Boreal Owls are found only in the mountains of the West, in extreme northern Minnesota, but visits other northern states very occasionally. The female is much larger than the male. Boreal Owls demonstrate the most extreme sexual dimorphism of any American owl. Finding its prey by the sounds they make, Boreal Owls can locate mice even under snow. Like other owls, one of the ear openings on a Boreal Owl's skull is placed much higher on the skull than the other. This ear asymmetry allow the owl to locate exactly where a sound orignates. Boreal Owls nest in holes in trees and usually are monogamous, but one male may mate with up to three females, and a female occasionally mates with two different males. Studies found that this type of polygynous and polygamous mating occured when dense populations of mice made finding prey to feed the young easier. When fewer mice were available, all the owls were monogamous.
