Eurasian wren - Troglodytes troglodytes

The Eurasian Wren is a very small bird, and the only member of the wren family Troglodytidae found in Eurasia. In Anglophone Europe, it is commonly known simply as the Wren. It was once lumped with "Troglodytes hiemalis" of eastern North America and "Troglodytes pacificus" of western North America as the Winter Wren.