The dusky warbler (Phylloscopus fuscatus) has an unstreaked brown back and buff underparts with a prominent whitish supercilium, and the bill is fine and pointed. A leaf warbler which breeds in the east Palearctic, the genus name Phylloscopus is from Ancient Greek phullon, "leaf", and skopos, "seeker". It is strongly migratory and winters in South Asia and South-east Asia. It sometimes occurs in North America in Alaska, and has also occurred in California.