Nuthatch Building Nest

The Europaean Nuthatch Sitta europaea, generally nests in holes on trees and reinforces just the entrance with mud. This pair were building a nest in the crevice in a wall, reminiscent of the Eastern Europaean Rock Nuthatch (Sitta neumayer) showing that the species have not diverged that far in nest-building habits. We watched it (?them) bring in mud and build a complete entrance to the nest area. Sometimes it disappeared into the nest as here and then elegantly hopped out and off for more materials. A wonderful harmonious setting for such an  elegant bird.