Szukana fraza: [Abstract = "The occupation of nest\-boxes by House\- and Tree Sparrow in Warsaw was investigated in 2005\-2009 and in 2012. Riparian forests, younger and older parks in downtown, and housing estates were included in the study as 4 types of habitats corresponding to the urbanization gradient of Warsaw. 1035 inspections of nest\-boxes suitable for both species \(type A\) were carried out during the breeding period and 345 nest\-boxes of other types were inspected after the breeding period."]
