The common chiffchaff, or simply the chiffchaff, (Phylloscopus collybita) is a common and widespread leaf warbler which breeds in open woodlands throughout northern and temperate Europe and Asia.It is a migratory passerine which winters in southern and western Europe, southern Asia and north Africa. Greenish-brown above and off-white below, it is named onomatopoeically for its simple chiff-chaff song. It has a number of subspecies, some of which are now treated as full species.