Snow covered mole hills of one (or more?) European mole(s) (Talpa europaea). Moles do not hibernate and are digging also in winter. They are not a big problem here and you rarely see so many hills so close together, so this must be a good spot for earthworms etc. This is captured in a protected swamp sanctuary. Normally a lot of this place is flooded and in winter frozen. And actually was looking for natures ice sculptures. But ended up with this pic. This dry winter all is different.
@wintivic Hi Vic, thanks for your comment. The blurry shadows in the background are trees. In this place grow a lot of White willows (Silberweiden - Salix alba). But the tall one is a poplar (Pappel-Populus...) most probably a black poplar. Also belonging to the family of the Salicaceae. But I'm not completly sure of the variation, as I did not pass by,...
@mona65 Thanks for the explanation Mona, I did wonder perhaps whether it might be a poplar, but I've never seen just one, usually there's a whole row of them.
