Eurasian Nuthatch

The Eurasian nuthatch, wood nuthatch (Sitta europaea), or simply nuthatch, is a small passerine bird found throughout the Palearctic and in Europe. Like other nuthatches, it is a short-tailed bird with a long bill, blue-gray upperparts and a black eye-stripe. It is a vocal bird with a repeated loud dwip call. There are more than 20 subspecies in three main groups; birds in the west of the range have orange-buff underparts and a white throat, those in Russia have whitish underparts, and those in the east have a similar appearance to European birds, but lack the white throat. Its preferred habitat is mature deciduous or mixed woodland with large, old trees, preferably oak. Pairs hold permanent territories, and nest in tree holes, usually old woodpecker nests, but sometimes natural cavities. Wikipedia →

10–20% of wildlife watchers report a Eurasian Nuthatch sighting in Biebrza National Park, based on 218 days of visitor records from GBIF citizen-science data.