Dartford warbler in decline | Bird decline, insect decline and neonicotinoids

An iconic bird of the Hampshire heathland has seen a dramatic decline in its numbers over the past few years. The Dartford warbler (Sylvia undata), unlike almost all other warblers, has suffered a major setback, with just 50 pairs reported across areas of Hampshire, Berkshire, Surrey and Sussex, according to the Royal Society for the Protection of Birds.