The Greenish Warbler, a leaf warbler, is native to lowland forests of eastern temperate Eurasia and Central Asia, avoiding the Tibetan
Plateau; it winters in India. It is a regular vagrant to the UK and Western Europe.
It looks similar to several related leaf warblers including the recently split Two-barred of Eastern Europe, the montane Hume's and the Yellow-browed.
Its claim to fame is that at the extremes of its extensive range the birds sing songs of different
complexity and have some behaviourial differences, leading to a possible divergence into two separate species in due course.