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Although color variation in Natrix species is relatively well documented, information on a local scale can still be considered lacking. Here we report on melanistic Natrix natrix individuals in an urban population from Belgrade, along with the occurrence of other interesting color morphs simultaneously. The reasons behind the occurrence of such peculiar coloration are also discussed. At the same time, this is the first documented occurrence of melanism in N. natrix in Serbia.

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According to international and national legislation European pond turtle and its habitats have been highlighted as priority regarding protection. Due to such status, this species is the subject of population research and active protection throughout its native range, however, systematic research was started only recently on the territory of the Republic of Serbia. Population studies of pond turtles have lasted the longest in our country at Lake Ludaš, where the twelfth research season was marked in August 2022. This paper presents the population parameters processed so far, including: population density, survival rate, gender ratio of adult individuals, as well as gender dimorphism in shell size and body mass. In addition, the threatening factors that were recorded on the terrain, as well as active protection measures that were undertaken or proposed have been described.