A hulking warbler that resembles Eurasian Reed-Warbler in coloration but far larger with a proportionately more massive head, heavy bill with a dark tip, and a broad, pale eyebrow. Breeds in reed beds, crashing through the reeds in short flights and bending stems when perched. Non-breeding habitat includes wet marshy areas, as well as drier habitats such as agricultural fields, savanna, and low scrubby growth. Song short but very loud and memorable with repeated phrases of "karra-karra-karra gurk gurk gurk chirrr-chirrr karra karra." Call a high-pitched “krrrrr."