Szukana fraza: [Abstract = "It is not clear why Berlin differs so much from cities such as Hamburg, London, and Warsaw, where considerably lower numbers of House Sparrows were found and where the species has been declining more or less strongly in the recent past. Food \(natural and anthropogenic\) and nesting sites \(especially crevices and cavities at buildings\) are still abundant in Berlin, while recent studies show a sufficiently high reproductive success of the species also."]

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