نتایج جستجو برای: crow
تعداد نتایج: 1723 فیلتر نتایج به سال:
West Nile virus (WNV)-associated disease has a range of clinical manifestations among avian taxa, the reasons for which are not known. Species susceptibility varies within the avian family Corvidae, with estimated mortality rates ranging from 50 to 100%. We examined and compared virologic, immunologic, pathologic, and clinical responses in 2 corvid species, the American crow (Corvus brachyrhync...
Communal roosting in birds may function to enhance foraging efficiency as explained by the information centre hypothesis, which predicts that successful foragers return from the roost to the rewarding food patch and that birds ignorant of this food follow knowledgeable roost-mates. We tested these predictions by exposing 34 radio-tagged, free-ranging, flock-living hooded crows (Corvus corone co...
Research was conducted to determine the food habits of Hawaiian Crow (Corvus hawaiiensis) nestlings, variety of food items ingested relative to their age, and the nutritional composition of ingested fruits. Knowledge of the fruits’ nutritive value and the nestlings’ diet allowed us to determine what plants best meet nutritional needs of adult and nestling crows for restocking purposes. Our eval...
The positive/negative symptom dichotomy is being increasingly utilized to explain the beterogeneity of schizophrenia, and poor response to neuroleptic treatment has traditiona!ly been considered to be one of the characteristic features of the negative syndrome. This issue was emphasized by Crow (1980), who principally based this conclusion on the study by Iohnstone et al. (1978), which found th...
The tissue pathology of the intestinal lining of a pheasant crow (Centropus sinensis) invaded by an acanthocephalan (Centrorhynchus globirostris) was studied from prepared slides. Prominent histopathology was evident viewing the infected tissue. There is extensive damage to the intestinal layers of the pheasant crow initiated by the multi hooked proboscis of the worm. The worm would often work ...
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