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But in many species of owls, level differences arise primarily for sounds that are shifted above or below the elevation of the horizontal plane. This is due to the asymmetry in placement of the ear openings in the owl's head, such that sounds from below the owl are louder in the left and sounds from above are louder in the right. [11]
Early radar ornithology mainly focused, due to limitations of the equipment, on the seasonality, timing, intensity, and direction of flocks of birds in migration. Modern weather radars can detect the wing area of the flying, the speed of flight, the frequency of wing beat, the direction, distance and altitude. [ 3 ]
The largest owls are two similarly sized eagle owls; the Eurasian eagle-owl (Bubo bubo) and Blakiston's fish owl (Bubo blakistoni). The largest females of these species are 71 cm (28 in) long, have a 190 cm (75 in) wing span, and weigh 4.2 kg ( 9 + 1 ⁄ 4 lb).
Barred owl. Typical or "true" owls are small to large solitary nocturnal birds of prey. They have large forward-facing eyes and ears, a hawk-like beak, and a conspicuous circle of feathers around each eye called a facial disk. Eastern screech-owl, Megascops asio; Great horned owl, Bubo virginianus; Snowy owl, Bubo scandiacus
The burrowing owl (Athene cunicularia), also called the shoco, is a small, ... In parts of South America, they are expanding their range due to deforestation. [15]
The snowy owl (Bubo scandiacus), [4] also known as the polar owl, the white owl and the Arctic owl, [5] is a large, white owl of the true owl family. [6] Snowy owls are native to the Arctic regions of both North America and the Palearctic , breeding mostly on the tundra . [ 2 ]
The northern hawk-owl feeds on a variety of prey, which can include small rodents to mammals more robust in size, and a variety of birds [16] — a typical diet for many boreal owls. [11] In Eurasia the northern hawk-owl is known to feed primarily on voles from the Microtus family.
The American (North and South America) horned owls and the Old World eagle-owls make up the genus Bubo, at least as traditionally described. The genus name Bubo is Latin for owl . Its name in Russian филин ( Russian for 'filin') is one of the few native Russian words containing the letter Ф .