I was in Copenhagen this week, and managed a couple of hours at Vestamager (Kalvebod Faelled) after my meeting finished rather early, taking a walk in the snow and ice out into the grassland.
It was a reasonable success, with several large raptors being the highlight. There were 2 or 3 hen harriers hunting over the grass and reeds, often coming within 30-40m of the paths I was on, and a much larger, uniformly brown unidentified raptor with bright white underwing patches - seemed too big for a buzzard but no white tail for rough-legged buzzard....! Also, a couple of kestrel completed the raptor line-up.
I didn't manage to get to the coastal part of the reserve, but still had two groups of mute swan and smallish group of bean goose and canada goose fly over (and I had spotted a large group of goldenye from the motorway bridge connecting Amager to Copenhagen).
As for passerines, the grassland was quiet, but the woods around the the visitor centre held good numbers of fieldfare, blue tit, great tit, goldfinch and siskin (although the siskin appeared very pale in colour...), as well as dozens of hooded crows and wood pigeon and a group of 5-6 redwing.