Maybe a Wild Boar? Or even Bear? Did you see any tracks?
Possible candidates are:
Roe Deer - regular at this feeder, but I am pretty sure they couldn't knock the feeder over, let alone bend a nearby metal pole.
Moose - odds on favourite, presumably strong enough, plus present on my land at present (hanging out in a hazel grove jutting into marsh a few hundred metres from the feeder) - female and calf a couple of weeks ago, single female today.
Wild Boar - close runner to favourite, also presumably strong enough, rooted up turf about 50 metres from the feeder today.
Brown Bear - outsider, would be my preferred choice. Style of disturbance fits bear, but bear is not regular in Lithuania - there was one about 100 km further north earlier in the summer.
Left a camera overlooking the box for the last and predictably nothing returned, bar dozens and dozens of
Jays ...and a major surprize - visiting both in the day and night, one
Woodcock strutting about in front of the camera and probing the soil around the grain box!
126. Woodcock.
Also, three
Lesser Spotted Eagles migrating south together today. Mammals seen today, one
Red Squirrel near the peanut feeders (plus a possibly guilty
Moose).