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Today I was lucky enough to find a location with lots of these. It was around 5 p.m. at Ozhigovo station, I found a big aspen (around 50 cm in diameter) that once broke at the height of ca. 6 m and fell on the ground. There were dozens of S. ustulata, mostly females, and they were laying eggs (I think a couple is visible in the left picture). It was not only bark of the trunk but also big branches. Some performed specific movements, slowly turning left or right, like screwing the bark.