Behaviour
Thailand’s second large-billed reed warbler, caught at Nam Kham Nature Reserve, Chiang Saen, on 27 March 2008 © P D Round/The Wetland Trust
Large-billed reed warblers probably spend around 3 months (June to August) on their relatively high-altitude breeding grounds, in Afghanistan and Tajikistan, with some still recorded from as far south as Burma in early May and from India in mid-May.
On breeding and wintering grounds they remain predominantly concealed (skulking), like other Acrocephalus warblers, but breeding males at times sing from relatively high and exposed perches in bushes.
They are insectivorous.
