Dartford warbler
It breeds on Mediterranean islands, typically including Corsica and Sardinia. The smaller Balearic Islands bird is increasingly given specific status as Balearic warbler, Curruca balearica. These two seem to form a superspecies which in turn groups with Tristram's warbler and the Dartford warbler. They are generally resident but some birds migrate south to winter in north Africa. They are rare vagrants to northern and western Europe.