Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 13 of 13 for “"barn owls"”.
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Development of Auditory Sensitivity in Barn Owls (Tyto furcata pratincola)
The development of hearing in the juvenile barn owl was investigated using tones (500 Hz to 12 kHz) and clicks of different rates (5-90 Hz). Auditory evoked potentials (AEPs) of the auditory nerve were recorded using the auditory brainstem response (ABR). Barn owl hearing matured in a similar trend …
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Anatomical, morphometrical and biomechanical studies of barn owls' and pigeons' wings
Wings and feathers of barn owls (Tyto alba) were investigated with anatomical, morphometrical and biomechanical methods in order to specify noise reduction and noise suppressing structures evolved by the owl. Pigeons (Columba livia) with a similar body weight were taken as a reference species. Barn …
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Aspects of sound localization and spatial attention in barn owls and rats
… auditory spatial attention: first, the barn owl as a highly-developed auditory specialist and, secondly, the rat as an auditory generalist. An influence of spatial attention on sound localization has solely been demonstrated in humans so far. Since barn owls are important animal models …
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Conserving a charismatic grassland species in Illinois: the barn owl
… habitat have declined. One such species is the barn owl, Tyto alba, which is threatened or endangered in 5 states. The conversion of grasslands into agricultural or developed areas has cost barn owls both suitable foraging habitat and nest sites. To mitigate this loss and support barn owl …
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Behavioral responses to frequency specific head related transfer functions as filtered by the facial ruff in the Barn owl (Tyto alba)
The barn owl is, due to its numerous morphological and neuronal adaptations to sound localization, a long-established model animal for the auditory system. Besides extensive research on the topic within the last decades, it is still unclear how direction- and frequency-dependent physical cues …
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The impact of a 'trough' Concentrated Solar Power facility on birds and other animals in the Northern Cape, South Africa
… likely died from a mirror impact. Western Barn Owls (Tyto alba) made up half of the mortalities. Biases in mortality estimates due to searcher efficiency and scavenger removal were substantial only for small birds. Twenty-one animals (3 reptiles, 12 mammals, 6 birds) likely drowned in the …
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On the perceptual identity of depth vision in the owl
… shaping technique was developed that prepared owls to be visually tested by images presented on a distant CRT-monitor. Second, it was demonstrated that owls can abstract the figure-ground organisation of computer generated random-dot images by testing two functions of vision that are thought to …
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Representation of binaural masking level difference in the inferior colliculus of the barn owl (tyto alba)
… important for animals and humans and crucial for barn owls. In natural environments, the spatial separation of signal and interfering noise improves detectability of the signal. In psychoacoustics experiments this is achieved by changing the spatial attributes of the sound, for example by shifting …
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Biologically inspired binaural sound source localization and tracking for mobile robots
… modulating a robot's attention inspired from the barn owl and last, a tracking system which makes it possible for a robot to track objects emitting sounds. Regarding sound source localization, the method that was best understood and evaluated is a method based on the evaluation of interaural time …
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Factors that affect owl ecology in an agricultural matrix in east Gauteng
… and three other owl species namely, the western barn owl (Tyto alba), the spotted eagle-owl (Bubo africanus) and the marsh owl (Asio capensis). The extensive road network, and particularly the N17 highway in this area have resulted in continued owl roadkills in the area. During 2002-2003 an …