Kamil Kaczmarek
Ornis Polonica 2020, 61: 305–321
https://doi.org/10.12657/ornis.2020.4.3
Abstract: During the seasons 2008–2009 and 2017–2019 a study was carried out to determine the size of a breeding population of the Eurasian Magpie Pica pica in Rataje district in Poznań. Based on found nests, two types of areas were destinguished: true territory (TR), defined as an area occupied in a breeding season, and a potential territory (PT), defined as a small part of a residential area where establishing a territory seems possible. Size of each area was measured. True territories (TR) were bigger (1.2 ha) than potential territories (0.6 ha). It also turned out that the neighbouring nests, were situated closer to one another, when they were separated by a building than those that were not separated by such a barrier.
Keywords: breeding territory, Magpie Pica pica, Poznań, territoriality
