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Hi Nikita
I?m not sure what species of Pyrrocoridae you?re likely to find on birch trees, but I don?t think these are Pyrrhocoris apterus ? their nymphs are more shiny and have less transverse spots on the abdomen. Although I can?t be sure, I suspect these could be young nymphs of Kleidocerys resedae ? the Birch Catkin Bug.