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The owls that had a fully intact facial ruff were able to hear a vast range of sounds very efficiently and with specific directionality. Upon removal of the auricular feathers, the results showed that the owls were not greatly affected, but the range at which the owls could efficiently hear different sounds slightly decreased.
Similar habitats were favored by both urban and suburban owls but urban owls had to range wider to avoid heavy human activity and access city parks and so had larger average ranges, 446 ha (1.72 sq mi) vs 56 ha (0.22 sq mi), while suburban ones had easier access to meadows and stands of woods.
The surface of the flight feathers is covered with a velvety structure that absorbs the sound of the wing moving. These unique structures reduce noise frequencies above 2 kHz, [20] making the sound level emitted drop below the typical hearing spectrum of the owl's usual prey [20] [21] and also within the owl's own best hearing range.
The northern saw-whet owl has vertically asymmetrical ears and different shapes of the ear openings. Because the sound reaches the ears at a different time and is of different intensity, the northern saw-whet owl can very precisely localize its prey. Such accurate sound localization allows it to hunt in complete darkness by hearing alone.
Most owls are nocturnal or crepuscular birds of prey. Because they hunt at night, they must rely on non-visual senses. Experiments by Roger Payne [32] have shown that owls are sensitive to the sounds made by their prey, not the heat or the smell. In fact, the sound cues are both necessary and sufficient for localization of mice from a distant ...
Hearing range describes the frequency range that can be heard by humans or other animals, though it can also refer to the range of levels. The human range is commonly given as 15.000 to 20,000 Hz, although there is considerable variation between individuals, especially at high frequencies, and a gradual loss of sensitivity to higher frequencies ...
The short-eared owl is a medium-sized owl measuring 34–43 cm (13–17 in) in length and weighing 206–475 g (7.3–16.8 oz). [9] It has large eyes, a big head, a short neck, and broad wings. Its bill is short, strong, hooked and black.
The Eurasian eagle-owl (Bubo bubo) is a species of eagle-owl, a type of bird that resides in much of Eurasia. It is often just called the eagle-owl in Europe and Asia. [4] It is one of the largest species of owl. Females can grow to a total length of 75 cm (30 in), with a wingspan of 188 centimetres (6 feet 2 inches). Males are slightly smaller ...