Eurasian Wren, Troglodytes troglodytes

Eurasian Wren
This is the original "Wren," still called by that name in the British Isles. Found throughout most of Europe, it is very similar to the Winter and Pacific Wrens of North America, and all three were once lumped together in a single species. They share the ability to sing long, loud, and beautifully, extraordinarily so for such a small bird.