The lesser spotted woodpecker (Dryobates minor)
These guys can often be found in the company of great tits, willow tits, and nuthatches, they are good friends. But only after the summer, from autumn to spring. In size, they are just like the other of the participants in the mixed flock, something about the tit or sparrow.
In the photo, as you can see, she (and this is a female) is sitting on a branch of a bush. Unlike their large woodpecker counterparts, they mainly examine thin branches of trees, and only occasionally can they be seen on the bark of trees, where they explore only rotten decayed thin bark.