Dartford warbler (Curruca undata) perched on a shrub. These long-tailed birds have a grey-brown head, body, and wings, along with a distinctive red eye-ring and a reddish-brown breast that features an off-white patch. The Dartford warbler is known for singing its scratchy, rambling song from a high perch on a gorse bush. Its diet mainly consists of small invertebrate prey.