|Cetti's Warbler Bird||Grasshoper Warbler Bird|
|River Warbler Bird||Savi's Warbler Bird|
|Aquatic Warbler Bird||Sedge Warbler Bird|
|Blyth's Reed Warbler Bird||Marsh Warbler Bird|
|Reed Warbler Bird||Great Reed Warbler Bird|
|Icterine Warbler Bird||Black Cap Warbler Bird|
|Garden Warbler Bird||Barred Warbler Bird|
|Lesser Whitethroat Warbler Bird||Common Whitethroat Warbler Bird|
|Dartford Warbler Bird||Greenish Warbler Bird|
|Wood Warbler Bird||Chiffchaff Warbler Bird|
|Willow Warbler Bird|
River warbler bird is a large dark warbler with a rather long, broad, graduated tail. River warbler bird is uniform dark olive greyish-brown on the upperparts, with dull and dingy underparts except for a whitish throat and centre to the belly. The throat and upper breast are streaked with diffuse mottlings making characteristic streaks, although this feature is variable. The undertail coverts are very long, olive brown with whitish scalloping created by the pale feather tips. The head is rather plain with a faint supercilium. Similar in many respects to Savi's Warbler, although in the breeding season the River shows strong habitat differences.
River warbler bird is a summer visitor, its breeding range stretches from central Europe north-eastwards across southern Finland and Russia. It is only a very rare vagrant to Britain. It is unlike its relatives in its choices of habitat, favouring dense tangled undergrowth in damp areas, moist woodland edges, bushes and tall scrub, riverine thickets, wetland margins and meadows with tall grass and herbage, and young deciduous trees such as alder, hazel, willow and birch. Rarely encountered except when singing.
The song of river warbler bird is similar to those of the other two Locustella species, in that it is an almost mechanical, insect-like buzzing that can continue for long periods, but with a distinctly different sound. It is much slower, consisting of 8-12 'signal peaks' per second, and the sound wavers noticeably, such as "zzh' zzh' zzh' zzh' zzh' zzh' zzh' zzh' zzh' zzh' zzh' zzh' zzh", etc. It is slow enough for the individual pulses to be discernible, although the notes themselves are complex and buzzy. The song is often introduced with "prrrik" or "trrrc" notes, and when alarmed the bird gives a sharp "pink" note. It sings from quite high in a bush or small tree, and is especially vocal at night.