Selective predation on common voles by Tawny Owls and Long-eared Owls in winter and spring
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Snowy Owl Predation on Short-eared Owls
A problem confronting Snowy Owls (Nyctea scandiaca) in their southern incursions is the shortage of food. This difficulty is raised by the presence of other raptors that feed on small mammals. This note shows how little food is found by migrant Snowy Owls and indicates a complex temporary ecological solution. At Tatoosh Island, Washington (48”24’ N, 124” 44’ W) on 25 November 1973, we observed ...
متن کاملDIFFERENTIAL mIGRATION BY SEx IN NORTH AmERICAN SHORT-EARED OWLS
Differential migration of the sexes is known in over 60 bird species and may be the predominant pattern in migratory birds. Identifying the causes of differential migration has been difficult, in part because sex-specific migratory patterns have yet to be described for a majority of species. We used the Internet specimen-data portal Ornis to compile sex-specific data on the seasonal distributio...
متن کاملDo owls use torpor? Winter thermoregulation in free-ranging pearl-spotted owlets and African scops-owls.
Numerous avian taxa use torpor, which involves pronounced reductions in body temperature (T(b)) to below normothermic levels. However, the occurrence of this phenomenon in owls (Strigidae) remains largely unknown. We investigated winter patterns of thermoregulation in the crepuscular 80-g pearl-spotted owlet Glaucidium perlatum and the strictly nocturnal 61-g African scops-owl Otus senegalensis...
متن کاملWinter Prey Caching by Northern Hawk Owls in Minnesota
—Northern Hawk Owls (Surnia ulula) have been reported to cache prey during the breeding season for later consumption, but detailed reports of prey caching during the non-breeding season are comparatively rare. We provided prey to four individual Northern Hawk Owls in wintering areas in northeastern Minnesota during 2001 and 2005 and observed their caching behavior. These owls cached 93% (n 14) ...
متن کاملFood-niche Relationships Between Great Horned Owls and Common Barn-Owls in Eastern Washington
organs. There are only two serious limitations to using feather pulp for electrophoretic analysis. First, the birds must either be molting when sampled or be subjected to plucking to stimulate feather regrowth and then recaptured at a later date. Second, in small birds such as Bobolinks, warblers (Parulidae), or chickadees (Parus spp.), only tiny amounts of tissue can be obtained from the fligh...
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ژورنال
عنوان ژورنال: TURKISH JOURNAL OF ZOOLOGY
سال: 2014
ISSN: 1300-0179,1303-6114
DOI: 10.3906/zoo-1303-20