Small songbird Phylloscopus collybita of the warbler family, Muscicapidae, order Passeriformes. It is found in woodlands and thickets in Europe and northern Asia during the summer, migrating south for winter. About 11 cm/4.3 in long, olive above, greyish below, with yellow-white nether parts, an eyestripe, and usually dark legs, it looks similar to a willow warbler but has a distinctive song.