When a noise is heard, the Owl is able to tell its direction because of the minute time difference in which the sound is perceived in the left and right ear - for example, if the sound was to the left of the Owl, the left ear would hear it before the right ear. The ruff functions as a reflector, channeling sounds into the ears. In fact, the eyes are so well developed, that they are not eye balls as such, but elongated tubes. When a noise is heard, the Owl is able to tell its direction because of the minute time difference in which the sound is perceived in the left and right ear – for example, if the sound was to the left of the Owl, the left ear would hear it before the right ear. An owl's eyes are large in order to improve their efficiency, especially under low light conditions. They are held in place by bony structures in the skull called Sclerotic rings.For this reason, an owl cannot "roll" or move its eyes - that is, it can only look straight ahead! The main reason owls can fly silently is the uniquely designed leading edges of their primary feathers. By having ears in two different locations owls can triangulate sounds. A hunting owl, therefore, will use the calls and movements made by a mouse, vole or shrew to direct its strike.

It's estimated that sound coming from the left of an owls reaches its left ear about 200 microseconds faster than the right ear. Owls' wings, however, are unique because they reduce noise caused by turbulence. Once a sound is detected, the owl orients toward it and accurately pinpoints its location to within 1.5 degrees in both horizontal and vertical planes. Owls have a disc shaped face, much like a satellite dish that funnels sound into its ears, one on each side of the facial disc / head one higher than the other, helping the owl to pinpoint sound Barn Owls have been shown to use sound frequencies above 8.5 kHz to direct and make an accurate strike at a prey item. The Barn Owl's sensitive hearing is enhanced by its facial ruff, a concave surface of stiff dark-tipped feathers. An owl's primary feathers are serrated like a comb. Owl hearing is certainly more sensitive than that of other birds, particularly at frequencies of 5 kHz and above. The asymmetry of the ruff and ears allows the owls to be maximally sensitive to sound. When most birds fly, turbulence — created when air gushes over the surface of their wings — causes noise.
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