Abstract
From 1950 until 1987 up to 3,350 nest-boxes were checked each year in woodland of Eastern Bavaria. Among the mammals bats (Myotis daubentoni and other species), dormice (Muscardinus avellanarius, Glis glis andEliomys quercinus) and mice (Apodemus spp.) were observed. The distribution of the dominant species is mapped (Figs. 1, 3) and the annual percentage of occupied boxes by different groups and species is shown in diagrams (Figs. 2, 4, 5). The quote of nest-boxes inhabited by small mammals increased since 1980. Several factors influencing the occurrence of mammals in nest-boxes such as adaption, competition, population density and climatic conditions are discussed.
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