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The northern saw-whet owl has a round, light, white face with brown and cream streaks; they also have a dark beak and yellow eyes. The underparts are pale with dark shaded areas; the upper parts are brown or reddish with white spots. Juveniles have a dark brown head and wings, and a tawny rust-colored breast and belly.
The bill is pale straw-yellow (occasionally showing a mild greenish tint) while the cere (a bare structure at the base of the beak) is "horn-colored". [9] [26] Its eyes are a dark brown color; the eyes may appear intensely black in the field and, although large, are fairly closely set. [29] [26] The barred owl has well-developed eye anatomy.
This owl does not have ear tufts and has the largest facial disc of any raptor. There is a white collar or "bow-tie" just below the beak. The long tail tapers to a rounded end. In terms of length, the great grey owl is believed to exceed the Eurasian eagle-owl and the Blakiston's fish owl as the world's largest owl.
The great horned owl (Bubo virginianus), also known as the tiger owl (originally derived from early naturalists' description as the "winged tiger" or "tiger of the air") [3] or the hoot owl, [4] is a large owl native to the Americas. It is an extremely adaptable bird with a vast range and is the most widely distributed true owl in the Americas. [5]
While the auditory and visual capabilities of the owl allow it to locate and pursue its prey, the talons and beak of the owl do the final work. The owl kills its prey using these talons to crush the skull and knead the body. [29] The crushing power of an owl's talons varies according to prey size and type, and by the size of the owl.
The striped owl (Asio clamator) is a medium-sized owl with large ear tufts and a brownish-white facial disk rimmed with black. Its beak is black, and it has cinnamon-colored eyes. It has shorter, rounder wings than most of its close relatives. The upperparts are cinnamon with fine black vermiculation and heavy stripes.
The eastern screech owl (Megascops asio) or eastern screech-owl, is a small owl that is relatively common in Eastern North America, from Mexico to Canada. [ 1 ] [ 3 ] This species resides in most types of woodland habitats across its range, and is relatively adaptable to urban and developed areas compared to other owls.
Unlike other owl species, these spots remain separated even when the tail is folded closely together. [12] The beak is light yellow, rather than dark like its relative the northern saw-whet owl. [13] The ears are asymmetrical in multiple bones, which enhances their hunting success. The boreal owl's flight is relatively noiseless and straight. [14]