Szukana fraza: [Abstract = "In supplemental feeding of birds we can distinguish between targeted actions and involuntary actions. Among ornithologists two extreme attitudes are apparent\: The suggestion to completely abandon feeding and stop providing nest boxes on the one hand, and the strong propagation of both supplementary feeding and putting up nest boxes to enrich the composition and abundance of birds on the other hand \(Berthold and Mohr 2008\). The results of several studies indicate that supplemental feeding of birds must follow specified rules \(Berthold and Mohr 2008, Graszka\-Petrykowski 2008, Szokalski and Wojtatowicz 1989\)."]

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