[3] This is a bird of open but shady mature woodlands, such as beech and sessile oak, with some sparse ground cover for nesting.

It can be distinguished from similar species, like the chiffchaff P. collybita and the willow warbler, P. trochilus by its yellow supercilium, throat and upper breast, pale tertial edges, longer primary projection, and by its shorter but broader tail.

Conservation measures are therefore required that provide and maintain the wood warblers preferred forest structure.

[7][8] It has two song types, often (but not always) given alternately; a high-pitched fluid metallic trill of increasing tempo pit-pit-pitpitpitpt-t-t-tttⓘ lasting 2–3 seconds, and a series of 3 to 5 descending piping notes of lower pitch piüü-piüü-piüü.

The contact call is a soft piping note, similar to the second song type, but shorter and given singly, piü.