![]() Three of the extant species are restricted to the New World, but the boreal owl has a circumpolar range through North America, Eurasia, the Alps, and the Rockies. They have repetitive whistling calls in the breeding season. They breed in tree holes, laying several eggs. The head is large, with yellow eyes and a well-defined facial disc. They are dark brown or black above, and whitish or buff below, marked with streaks or spots in the two northern forms. These owls take mainly rodents and other small mammals as their prey, but also feed on birds, bats, insects, and other invertebrates according to what is available. The species varies from 18 to 27 cm in length.
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