The Common chiffchaff is greenish-brown above and off-white below. It has dark legs, a fine dark bill, and a short primary projection (extension of the flight feathers beyond the folded wing). As the plumage wears, it gets duller and browner, and the yellow on the flanks tends to be lost. The newly fledged juvenile is browner above than the adult, with yellow-white underparts, but molts about 10 weeks after acquiring its first plumage. After molting, both the adult and the juvenile have brighter and greener upper parts and a paler supercilium (also known as an "eyebrow).
Common chiffchaffs breed across Europe and Asia, with isolated populations in northwest Africa, northern and western Turkey, and northwestern Iran. They are migratory birds that winter in southern and western Europe, southern Asia, and North Africa. Their breeding habitat includes open woodlands with some taller trees and ground cover for nesting purposes. In winter, Common chiffchaffs use a wider range of habitats including scrub, and willow thickets, and are often found near water. They also frequent parks, gardens, hedgerows, and cultivated areas.
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