The Greenish Warbler (Phylloscopus trochiloides), is a widespread leaf-warbler throughout its breeding range in northeast Europe and northern Asia. This warbler is strongly migratory and winters in India. It breeds in lowland deciduous or mixed forest. This species occurs as a spring or early autumn vagrant in western Europe and is annual in Great Britain.
This is a typical leaf-warbler in appearance, grayish-green above and off-white below. Its single wing bar distinguishes it from most similar species, except Arctic Warbler, Phylloscopus borealis. It is slightly smaller than that species and has a thinner bill, without a dark tip to the lower mandible. Its song is a high jerky trill.
The nest is on the ground in low shrub. Like its relatives, this small passerine is insectivorous.