Australian Reed Warbler
Acrocephalus australis
Voice: Described as a sweet melodious warble with rich fluty notes as well as hard and metallic sounding notes, Australian reed warbler song is loud and varied. The song of this species consists of sets of short sequences consisting of a pattern of sounds that is repeated, after a 3-5 second interval, in varied combinations.
ID text from Wikipedia, CC BY-SA 4.0
Clamorous Reed Warbler
Acrocephalus stentoreus
Clamorous reed warbler is a large song thrush-sized warbler at 18–20 cm. The adult has an unstreaked brown back and whitish underparts. The forehead is flattened, and the bill is strong and pointed. The sexes are identical, as with most warblers. It is very like the great reed warbler, but that species has richer coloured underparts. There are a number of races differing in plumage shades. The migratory northern race has the richest brown upperparts, and the endemic Sri Lanka subspecies is the darkest form.
ID text from Wikipedia, CC BY-SA 4.0

Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Australian Reed Warbler and Clamorous Reed Warbler.