Chalcosyrphus eunotus is one of the most endangered saproxylic hoverflies in Poland. Almost 80 years since its first record in Pomerania, this fly has been found in a few new localities in Poland: Ojców National Park, Białowieża Primeval Forest, and in the vicinity of following cities: Toruń, Gdańsk, Łódź and Inowłódz. The actual map of its range in Poland is presented and the current state of knowledge of its phenology, ecology, behavior and conservation status is discussed. The authors advance the hypothesis that the increasing occurrence of Ch. eunotus is directly proportional to an increase in the number of beavers over the last 20 years.
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