Eurasian Nuthatch
The Eurasian Nuthatch (Sitta europaea) is a small bird occurring within a vast region including most of Europe and northern Asia. The birds are famous for their extraordinary climbing abilites and can descend trees head first. They forage for insects and other small invertebrates on the bark of trees or bushes, but they are also common visitors at bird tables in the winter season where they supplement their diet with nuts and seeds. The birds favor woodlands as their habitats and often breed in tree holes originally inhabited by wood peckers. If the entrance to these caves is too large, they plaster it with mud to reduce their size. I have photographed these birds in Germany where the European Nuthatch is one of the most abundant species.
Eurasian Nuthatch
Matt Travels 
This looks a lot like the Red Breasted Nuthatches we have here in the US, although I’ve only seen them in northern regions, where there are spruce trees. I find it so interesting to learn what birds North America and Europe share, so many are similar.
Thanks for your comment! You are right, the Red-breasted Nuthatch is closely related. Actually there are more than 20 species belonging to the genus Sitta and many of them look quite similar and share the same life style. But so far I did not see the American branch of the family!