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.

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