Bird Guide

Lesser Swamp Warbler vs Oriental Reed Warbler

Lesser Swamp Warbler (Acrocephalus gracilirostris)

Lesser Swamp Warbler

Acrocephalus gracilirostris

Tiny14 gWetland

The lesser swamp warbler is a plain-coloured smallish bird 14–16 cm long and weighing around 20 g. Its upperparts are rich brown, and it has a white supercilium. The underparts are white, with a rufous wash to the flanks. The long, strong bill has a slightly down-curved upper mandible; it is blackish-yellow with a yellower base. The legs are blue-grey and the eyes are brown. Adults of both sexes and juvenile birds are very similar in appearance.

ID text from Wikipedia, CC BY-SA 4.0

Photo: i_c_riddell · CC BY 4.0
Oriental Reed Warbler (Acrocephalus orientalis)

Oriental Reed Warbler

Acrocephalus orientalis

Small24 gWetland

It is a large warbler, 18–20 cm long with a wingspan of 23–26 cm. The plumage is brown above with a paler rump and whitish tips to the tail feathers. The underparts are whitish below, browner on the flanks and undertail-coverts. There are narrow greyish streaks on the throat and breast. It has a dark eyestripe and a whitish stripe above the eye. The fairly long, heavy bill is brownish above and pink below with a bright orange gape. The feet are grey. It is slightly smaller, slenderer and shorter-winged than the great reed warbler.

ID text from Wikipedia, CC BY-SA 4.0

Sonogram of the Oriental Reed Warbler
Recorded by steve · Song · Beijing, Bei Jing Shi, China · CC BY-SA 4.0
Photo: (c) Kim, Hyun-tae, some rights reserved (CC BY), uploaded by Kim, Hyun-tae · cc-by

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Photos and recordings are credited to their authors under the licence shown. Full profiles: Lesser Swamp Warbler and Oriental Reed Warbler.