Green on the back and pale below; has a strong white eyebrow which is broad behind the eye and goes all the way to the forehead. Usually has one broad pale wingbar. Can be very unobtrusive and difficult to spot. Breeds in lowland and montane deciduous and mixed forest. Song is a high-pitched long series "tsit-psityee psityu-psi-ti-ti-ti-ti-si," but often detected by its call, a two-parted "t-sli" with flat or downward inflection. Similar to Green Warbler which co-occurs on wintering ground, best separated by call and Green's brighter green back and yellower underside.