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The Collared Flycatcher Ficedula albicollis population nesting in natural cavities in the Białowieża National Park was studied during 1988-1994. In none of the 534 cases, when a Collared Flycatcher was seen entering a natural cavity, was it killed. Additionally, in less than 2% (10/534) of observations did the male enter cavities owned by a different bird species. We suggest that competition for nest...
In 1992-1995 we examined the effect of arrival time and age of male Collared Flycatchers Ficedula albicollis, secondary cavity nesters, on the quality of the nest site chosen. Data were collected in the primaeval, mature (170-250 year old) oak- hornbeam forest of Białowieża National Park (Eastern Poland). There were no nest-boxes and all birds nested in natural holes. We determined male arrival time,...
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