Is the communal roosting behaviour of the Magpie (Pica pica) wind dependent? An example from an isolated population in W Poland

The Magpie is a residential non-migratorybird (Goodwin, 1986; Birkhead, 1991).Each pair of birds controls its own territoryall the year around. However, in winter thismonogamous bird sleeps in communal roosts.Birkhead (1991) discussed some of the mainideas, which may explain this behaviour.

Pawel CZECHOWSKI, Leszek JERZAK, Piotr ZDUNIAK and Marcin BOCHENSKI, Ardeola, 52(2), December 2005, 333-339