Butterflies (Lepidoptera: Rhopalocera) of the western part of Bydgoszcz (Poland) have been investigated for the period of 24 years. Significant changes in the fauna have been found.
The paper shows the results of faunistic research on the Lepidoptera in the Massif Grojec (Żywiec Beskid). In total 45 species of butterflies were recorded between 2008–2009. The results were analyzed in relation to the available literature data.
49 species belonging to the families Nymphalidae, Lycaenidae, Pieridae, Hesperiidae and Papilionidae were found in „Uroczysko Lipnik” and made about 28% of the total number of Rhopalocera species ever reported from Poland. In the study area found to be present Lycaena dispar. It is the only one protected species of Rhopalocera occurring in the study area.