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Criorhina ranunculi · žiedmusė

EN · Large Bear Hoverfly DE · Große Pelzschwebfliege

https://en.wikipedia.org/wiki/Criorhina_ranunculi The larvae develop in the damp rotting roots and low heart-rot of mature trees (perhaps especially oaks), and females can sometimes be seen investigating the bases of such trees to oviposit or resting on tree trunks.