Szukana fraza: [Opis = "The relative density of the house mouse in Poland was estimated on the basis of the perecentage it formed in 938 collections of owl pellets from period 1955\-1971, in squares of the 50X50 km UTM grid. Regions situated to the west of the River Vistula are characterized by low and medium density of the house mouse. High and very high density of M. musculus was found in the Pomeranian Lake District \(square CE\), Masovian Lowland \(DC\) and Sandomierz \(EB\) and Lublin Uplands."]

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