The study was carried out in 2000–2002 around 6 rookeries. Rooks foraged in numbers from 1 to 132 birds (n = 417); flocks of less than 10 individuals were dominant. The type of crop influenced the size of a foraging flock. Most of the rooks were recorded within 0.5–1 km of the rookery, while the greatest distance of a foraging ground from the rookery ( = 2833.3 m) depended on the size of that rookery. Spring corn, meadows and pastureland were of the greatest significance in the rooks' foraging area. Winter corn and root crops were avoided, while wasteland areas were visited intermittently.
REFERENCES
D. F. Chantrey
1982. Foraging strategies of Rook (Corvus frugilegus): a simulation. Z. Tierpsychol. 59: 157–171. Google Scholar
S. Cramp
,
C. M. Perrins
(eds).
1994. The Birds of the Western Palearctic. Vol. VIII. Oxford Univ. Press. Google Scholar
C. J. Feare
1974. Ecological studies of the Rook (Corvus frugilegus L.) in the north-east Scotland. Demage and its control. J. Appl. Ecol. 11: 897–914. Google Scholar
C. J. Feare
,
G. M. Dunnet
,
I. J. Patterson
1974. Ecological studies of the Rook (Corvus frugilegus L.) in the north-east Scotland: food intake and feeding behavior. J. Appl. Ecol. 11: 867–896. Google Scholar
J. Gromadzka
1980. Food composition and food consumption of the Rook Corvus frugilegus in agrocoenoses in Poland. Acta Ornithol. 27: 227–256. Google Scholar
J. Höglund
1985. Foraging success of Rook Corvus frugilegus in mixed-species flocks of different size. Ornis Fenn. 62: 19–22. Google Scholar
Z. Hubalek
1983. Roosts and habits of Corvus frugilegus wintering in Czechoslovakia. Acta Sci. Nat. Brno 17: 1–52. Google Scholar
J. Jacobs
1974: Quantitative measurement of food selection. Oecologia 14: 413–417. Google Scholar
Z. Kalotas
1985. [Feeding habitat and economic importance of the Rook (Corvus frugilegus L.) in Hungary]. Aquila 92: 175–239. Google Scholar
Z. Kasprzykowski
2001. [Numbers of the Rook Corvus frugilegus in a breeding colony on the Siedlecka Plateau]. Kulon 6: 63–69. Google Scholar
Z. Kasprzykowski
2002. [Reproductive biology of the Rook Corvus frugilegus in the agricultural landscape of eastern Poland]. Notatki Ornitologiczne 43: 219–226. Google Scholar
M. Luniak
1972. [Distribution of Rook, Corvus frugilegus L., colonies in Siedlce district (Voivodeships of Warszawa)]. Acta Ornithol. 13: 425–449. Google Scholar
M. Luniak
1977. [Consumption and digestion of food in the Rook, Corvus frugilegus L., in the condition an aviary]. Acta Ornithol. 16: 213–234. Google Scholar
J. Pinowski
1956. Gospodarcze znaczenie gawrona (Corvus frugilegus L.). Ekol. Pol., Ser. B, 2: 109–117. Google Scholar
R. K. Waite
1984. Winter habitat selection and foraging behaviour in sympatric corvids. Ornis Scand. 15: 55–62. Google Scholar
A. Winiecki
2000. The wintering strategy of Rooks Corvus frugilegus Linnaeus, 1758, in Poznań, west Poland. Acta Zool. Cracov. 43: 135–164. Google Scholar