The Eurasian wren Troglodytes troglodytes is a very small bird, and the only member of the wren family Troglodytidae found in Eurasia and Africa Maghreb. 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. The Eurasian wren occurs in Europe and across the Palearctic - including a belt of Asia from northern Iran and Afghanistan across to Japan. It is migratory in only the northern parts of its range. It is also highly polygynous, an unusual mating system for passerines.
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