@misc{Mitrus_Cezary_Natural_2004,
 author={Mitrus, Cezary and Soćko, Beata},
 editor={Polska Akademia Nauk. Muzeum i Instytut Zoologii},
 copyright={Rights Reserved - Free Access},
 address={Warszawa},
 howpublished={online},
 year={2004},
 language={eng},
 abstract={117 nests of Red-breasted Flycatchers in Białowieża primeval forest (NE Poland) are characterised. Most nests (79%) were built in Hornbeam Carpinus betulus and Lime Tilia cordata. Three types of nest sites were distinguished: chimney shaped (26.4%), half-cavities (46.4%), or shelves — the nest is wedged under a piece of bark against the main trunk (27.3%). Most cavity entrances were exposed to the south. Compared to other species of secondary cavity nesters in Białowieża National Park, Red-breasted Flycatchers used cavities of a different shape, with a smaller bottom area, and at a relatively low height above the ground (>>= 4.9 ą 3.12 m). Nesting trees had a smaller diameter (>>= 31.2 ą 21.4 cm) and were more often dead (27%) than trees used by other secondary cavity nesting species. Only four nest sites were used in consecutive seasons.},
 type={Text},
 title={Natural nest sites of the red-breasted flycatcher Ficedula parva in a primeval forest},
 volume={39},
 number={1},
 journal={Acta Ornithologica},
 publisher={Museum & Institute of Zoology},
}