(Hayvan Bilim, Zooloji) The Marsh Warbler, Acrocephalus palustris, is an Old World warbler in the genus Acrocephalus. It breeds in temperate Europe and western Asia. It is migratory, wintering in south east Africa. It does not breed in the Iberian peninsula, and in England it is scarce and declining, with the former main centre of population in Worcestershire now extinct