River Warbler
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Locustella fluviatilis
Breeds in Eastern Europe & are very rare vagrants to Britain, mainly in the Autumn on the Shetland Islands.
Breeds in Eastern Europe from Hungary to Poland.
Adults have unstreaked grey-brown back, whitish grey underparts, and a darker undertail, which has white feather tips giving a contrasting pattern.
The sexes are identical, as with most Warblers, but Juveniles are yellower below.
However, they typically still have a streaked breast and more olive colouration on the upperparts.
The song is a monotonous mechanical insect-like reeling, often given at dusk.
It is similar to the song of other species in the group, but has more of a sewing machine quality, and may be produced for long periods.