Tengmalm's Owl, Aegolius funereus, is a small owl. It is known as the Boreal Owl in North America. This species is a part of the larger grouping of owls known as typical owls, Strigidae, which contains most species of owl. The other grouping is the barn owls, Tytonidae. This bird is named after the Swedish naturalist Peter Gustaf Tengmalm.
The Tengmalm's Owl is 22–27 centimetres (8.7–11 in) long with a 50–62 centimetres (20–24 in) wingspan. It is brown above, with white flecking on the shoulders. Below it is whitish streaked rust color. The head is large, with yellow eyes and a white facial disc, and a "surprised" appearance. The beak is yellow light colored rather than a dark beak like its relative, the Northern Saw-whet Owl. The flight is strong and direct. Young birds are chocolate brown. The bird's call is similar in sound to the "winnowing" of the North American Wilson's Snipe. This species is not normally migratory, but in some autumns significant numbers move further south. It is rarely any great distance south of its breeding range, although this is partly due to the problems of detecting this nocturnal owl outside the breeding season when it is not calling.
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