Wildlife Spotting

Why should I be angry? I'm looking for help and am happy to learn. After all I haven't been able to figure this one out on my own. I understand that the Eurasian Wren is more reddish on top and lighter, but my Svensson (German edition) says that the Northatlantic subspecies would be darker and have a longer beak. A wren coming from the British Isles is much more likely than one coming all the way from Northamerica, right? Unless it's a completely different bird altogether. ;)

Could it be the Eurasian Wren (Troglodytes troglodytes)?

Thanks for your suggestion, Stian. I know birds have wings and I know they use them, but I doubt the chance of finding a Northamerican bird in a German park is very high.