منابع مشابه
The Nesting of the Great Horned Owl
ON March 19, 1926, the nest of a Great Horned Owl (Bubo virginianus pallescens?) was found in one of the thickly wooded canyons on the military reservation, Fort Riley, Kansas, which presented an unusual opportunity for intimate study of the nest life and growth of the young from very early in their life history until the leaving of the nest. The terrain consists of rolling grass-covered hills ...
متن کاملPellet Formation in a Great Horned Owl: a Roentgenographic Study
IN the literature on owls, there has been much interest in the formation in the upper gastro-intestinal tract of pellets which contain indigestible material and which are subsequently regurgitated. This feature of gastrointestinal function has interested bird physiologists, and analysis of the pellets has been used to monitor feeding habits (Errington et al., 1940). Although pellet formation is...
متن کاملSpatial selectivity and binaural responses in the inferior colliculus of the great horned owl.
In this study we have investigated the processing of auditory cues for sound localization in the great horned owl (Bubo virginianus). Previous studies have shown that the barn owl, whose ears are asymmetrically oriented in the vertical plane, has a 2-dimensional, topographic representation of auditory space in the external division of the inferior colliculus (ICx). As in the barn owl, the great...
متن کاملFine structure of the pecten oculi in the great horned owl (Bubo virginianus).
The pecten oculi of the great horned owl (Bubo virginianus) has been examined by light and electron microscopy. The pecten in this species is of the pleated type and is small in comparison to the size of the eyeball. It consists of 7-8 accordion folds which are joined apically by a pigmented bridge of tissue. Within each fold are numerous capillaries, larger supply and drainage vessels and plen...
متن کاملELECTRORETINOGRAPHIC RESPONSES OF THE GREAT HORNED OWL ( Bubo virginianus ) STEVEN J . AULT AND EDWIN
ABSTR^CT.--Electroretinograms were recorded from four Great Horned Owls (Bubo virginianus). Two procedures, dark adaptation and flicker stimuli, were used to assess the contributions of rod and cone systems to electroretinograms. Recordings obtained after dark adaptation demonstrated scotopic (rodgenerated) components. B-waves were broad and rounded and had a fairly long latency. When high inte...
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ژورنال
عنوان ژورنال: Blue Jay
سال: 1954
ISSN: 2562-5667,0006-5099
DOI: 10.29173/bluejay1670