"British Isles" Wren (Troglodytes troglodytes)

This species sings gloriously in spring (and throughout the rest of the year come to that) and it's probably a very good thing it does because it's common (English) nomenclature is a mess. It's variously called Northern, Eurasian, Winter or even House depending on where it occurs in the world. The British race is this one Troglodytes troglodytes indigenus which is the only unequivocal way of classifying it...