@misc{Osiejuk_Tomasz_S._Study_1998,
 author={Osiejuk, Tomasz S.},
 volume={33},
 editor={Polska Akademia Nauk. Muzeum i Instytut Zoologii},
 number={3-4},
 copyright={Creative Commons Attribution BY 3.0 PL license},
 address={Warszawa},
 journal={Acta Ornithologica},
 howpublished={online},
 year={1998},
 publisher={Muzeum i Instytut Zoologii PAN},
 language={eng},
 language={pol},
 type={Text},
 title={Study on the intersexual differentiation of foraging niche in relation to abundance of winter food in great spotted woodpecker Dendrocopos major},
 URL={http://rcin.org.pl/miiz/Content/43593/PDF/WA058_60647_P257-T33_Acta-Ornith-Nr-2-6.pdf},
 keywords={Great Spotted Woodpecker, nutrition, wintering, Poland, Wielkopolska National Park, intraspecific competition, food availability, foraging behaviour, woodpeckers, birds, Dendrocopos major, Picidae, Aves, 1991-93},
}