Boomklever.
The Eurasian nuthatch, we have m on our balcony everyday and at first they got harassed by the blue tits but they all seem to get along now. They move smooth and appear glued to any surface.
This picture is not OC.
Your nuthatches are pretty. Ours are a little drab but I like them anyway. They always seem to be facing down the tree for some reason
If it didn't face down, you'd be looking at a tree creeper :)