Szukana fraza: [Abstract = "This view has been commonly accepted now. In cities species inhabiting the built\-up and green areas as well as water birds are usually fed \(Berthold and Mohr 2008\). Despite the fact that the problem of feeding birds has been studied often an in depth in Western Europe and North America, in Poland there are no publications on this topic so far. Supplemental feeding of birds has also biological consequences, increasing survival and breeding success in the next season \(Doerr and Silvy 2002, Robb et al. 2008\)."]

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