Szukana fraza: [Abstract = "Number of House Sparrow was related to area\/presence of buildings. Renovations of buildings strongly influenced local number of this species, however they were not the main cause of its decline. Although nest\-boxes were occasionally used by H. Sparrow, their presence could not stop the decrease in numbers caused by loss of nest sites. Tree Sparrow showed greater plasticity in their choice of nest sites. In parks their abundance was correlated with the number of nest boxes. It was suggested that in this habitat, the observed decrease of House Sparrow with simultaneous abandonment of nest\-boxes \(and other nest sites\) may have contributed to the increase in Tree Sparrows."]

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