The Common chiffchaff (Phylloscopus collybita) is a widespread leaf warbler found throughout northern and temperate Europe and the Palearctic. It has a number of subspecies, some of which are now treated as full species. The female of this species is responsible for building a nest and assumes most of the responsibility for brooding and feeding the chicks, whilst the male has little involvement in nesting, but defends his territory against rivals, and attacks potential predators.
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.
Common chiffchaffs are active diurnal birds. They are generally solitary but may join small flocks including other warblers prior to migration. Chiffchaffs forage both on the ground and in bushes, low vegetation, and trees, moving restlessly through foliage or briefly hovering. They may even pick insects from the water surface. These small birds require about one-third of their weight in insects daily, and they feed almost continuously in the autumn to put on extra fat as fuel for the long migration flight. Common chiffchaffs are among the last songbirds to leave in late autumn and are one of the first to return to their breeding areas in the spring and their repetitive cheerful 'chiff-chaff' song is one of the first signs that spring has returned. Their common call is a soft and simple 'hooeet' or 'hweet' and mates communicate with each other using short 'drit' or 'it'.
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