In urban areas of Łódź (Central Poland), the vertical and horizontal distributions of the Blackbird Turdus merula and Song Thrush Turdus philomelos nests were investigated in relation to running lanes and paths as places of penetration of humans. A significant effect of human penetration on vertical and horizontal distribution of Blackbird nests in parks was found. The park population of Blackbirds, unlike forest-breeding ones built nests more distantly from the lanes, lower, and under the shelter of shrubs. In the Blackbird park population, 74.2% of the nests were built in shrubs. The mean nesting height was 1.18 m. Distribution of distance between the nest and lanes are negatively skewed to = -0.57). The reverse was true of the forest population of this species where81.9% nests were built in trees. The mean nesting height was 1.29 m. Nests of the forest population of Blackbird were distributed randomly. Differentiation in nest sides between urban and forest populations of Blackbird is a statisticaly significant. Only one pair of the Song Thrush was recorded in a parks. The forest population of the Song Thrush nesting in the trees, mean nesting height was higher than those of the Blackbird. The presence of people in thef orest had a significant negative effect on the horizontal distribution of Song Thrush nests. Therefore, human disturbance is considered the factor that prevents this species from colonising urban parks (contrary to the situation in West European countries).
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