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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.
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.
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]
The Magellanic horned owl, while somewhat similar in coloring, has yellow eyes like other horned owls, not amber eyes. B. v. nacurutu is a medium-sized race, smaller than most in North America but not as small as some of the Mexican races. The wing chord length is 330–354 mm (13.0–13.9 in) in males and 340–376 mm (13.4–14.8 in) in ...
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 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 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 black-and-white owl is a medium-sized owl with a round head and no ear tufts. It is between 35 and 40 cm in length and weigh between 400 and 535 grams. As for most owl species, females are usually bigger than males with an average weight of 487 g and 418 g respectively. [4] It has a striped black-and-white breast, belly, and vent.