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Winter bat census in hibernacula of the Muránska planina National Park was carried out in 2002-2013 and its results are presented here. In 37 roosts (out of 41 potential roosts checked, i.e. 90.2%) hibernating bats were found; altogether 19 bat species were recorded. Rhinolophus hipposideros was the most abundant and most frequent (D=62.6%, F=70.7%), followed by Myotis myotis s.l. (D=25.3%, F=75.6%). Four species with less than ten individuals recorded are considered to be rare in the respective region: Miniopterus schreibersii, Myotis bechsteinii, Plecotus austriacus, and Rhinolophus euryale. Three groups of sites could be determined based on the analysis of species dominance: (A) hibernacula situated mostly at lower altitudes with the dominance of Rhinolophus hipposideros, (B) hibernacula mainly with the presence of Pipistrellus pipistrellus and Barbastella barbastellus aggregations, and (C) hibernacula with higher species diversity situated mostly at higher altitudes. In the study period, an increase in numbers could be clearly observed in Rhinolophus hipposideros, while no obvious population trends were recorded among other species. Possible reasons of disappearance of the Barbastella barbastellus and Pipistrellus pipistrellus mass aggregations are discussed. [ABSTRACT FROM AUTHOR]