Analyses of tawny owl pellets were used to determine the species composition and distribution of small mammals in Kampinos National Park and its protection zone (central Poland). The total material collected from 58 localities contained the remains of 11,235 vertebrates (including 8,335 mammals). The study revealed 29 species of small mammals of the following orders: Soricomorpha - 4, Chiroptera - 9, Rodentia - 14, Lagomorpha - 1 and Carnivora - 1. These included two bat species of special interest (Myotis myotis and Barbastella barbastellus) listed in the 2nd Annex to the Habitats Directive of the European Union. Muscardinus avellanarius, a rodent typical of broad-leaved woodland, appeared to be relatively common and abundant in suitable habitats. Species inhabiting wet habitats, Microtus oeconomus and Neomys fodiens, were found in many localities, whereas Arvicola amphibius was rarer and less abundant. Some important refuges of small mammals were found, mostly in strictly protected areas. Although the studies conducted to date in this area likely reveal a complete list of small species of Soricomorpha and Rodentia, it is possible that 3-5 species of Chiroptera and 2 small species of Carnivora may remain to be identified.
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