Szukana fraza: [Abstract = "The population of House Sparrows in most of European cities declined in the end of the XX century \(De Laet \& Summers\-Smith 2007\). One of the presumable reasons of this decline is loss of nest sites. The House sparrow is a secondary hole\-nester \(Anderson 2006\) and places its nest in holes of buildings, shrubs and nest boxes. The rate of nest box occupation depends on the location and competition with other species \(Anderson T.R. 2006\)."]

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