Bird censuses were carried out in four breeding seasons, 1992-1995, in a natural beech forest on Mt. Karimata, Kumamoto Prefecture, western Japan. The Red-billed Leiothrix Leiothrix lutea has invaded there a few years before. The density fluctuations of species possibly competing with the Red-billed Leiothrix were studied. Thirty-three bird species were recorded. the Red-billed Leiothrix already colonized there, whereas the Bush Warbler Cettia diphone decreased in number. The density of the

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... Tit P. ater was stable, but that of the Great Tit Parus major fluctuated.