@misc{Antonov_Anton_(1977–2012)_Re-use_2003,
 author={Antonov, Anton (1977–2012) and Atanasova, Dimitrinka},
 editor={Polska Akademia Nauk. Muzeum i Instytut Zoologii},
 copyright={Rights Reserved - Restricted Access},
 address={Warszawa},
 howpublished={online},
 year={2003},
 language={eng},
 abstract={Nest re-use in a high density population of Magpies in the City of Sofia and its vicinity was studied during 1999-2000. The rate of nest re-use was significantly higher within the urban area (17%) as compared to the immediate rural surroundings within a distance of 1 km (7%). Re-used nests were on average higher above the ground than newly-built nests. The nest re-use rate was not related to breeding density, abundance or the mean height of available trees. Magpies re-using their old nests laid eggs significantly earlier compared to those building new nests. However, nest re-use did not confer other benefits on the reproductive output since clutch size, hatching and fledging success did not differ significantly between the two nesting strategies.},
 type={Text},
 title={Re-use of old nests versus the construction of new ones in the magpie Pica pica in the city of Sofia (Bulgaria)},
 volume={38},
 number={1},
 journal={Acta Ornithologica},
 publisher={Museum & Institute of Zoology},
 keywords={Magpie, birds, Bulgaria, Sofia, nest reuse, breeding success, Pica pica, Corvidae, Aves, 1999-2000},
}