The Blackcap, Sylvia atricapilla,'s a common and widespread sylviid warbler which breeds throughout northern and temperate Europe. Its color pattern's unique in the genus Sylvia; the Blackcap's closest living relative's the Garden Warbler which looks different but has very similar vocalizations. These two, whose ranges extend farther northeastwards than other Sylvia, seem to form sister species well distinct from the other typical warblers (Helbig 2001, Jønsson & Fjeldså 2006). It's… (More on Blackcap)