Factors affecting the breeding performance of the Magpie (Pica pica) in three European cities.

The breeding biology of the Magpie (Pica pica) was studied in three European towns: Dublin 1981-1983, Zielona Góra 1984-1987 and Slupsk 1987-1988. Information was gathered on breeding success from 316 nests observed from the ground (162 Zielona Góra, 154 Slupsk), and 115 nests by direct observation of contents (93 Dublin 22 Zielona Góra)