Greenish Warbler

The greenish warbler is a typical leaf warbler, greyish-green above and off-white below. The single wing bar found in the southern and western populations distinguishes them from most similar species, except the Arctic warbler. It is slightly smaller than that species and has a thinner bill without a dark tip to the lower mandible. Wintering birds from further north are smaller, so the species does not seem to follow Bergmann's rule. The song is a high, jerky trill, in some populations containing a sequence of down-slurred and more rarely up-slurred notes. (Wikipedia, general species account)

A widespread leaf warbler, it breeds in northeastern Europe and temperate to subtropical continental Asia and is strongly migratory, wintering in India. It is not uncommon as a spring or early-autumn vagrant in western Europe and is seen annually in Great Britain. In Central Europe large numbers of vagrants turn up in some years, and a handful of pairs stay to breed in Germany each year. (Wikipedia, general species account)