River warbler

River Warbler
Conservation status
Least Concern  (IUCN 3.1)
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Aves
Order:	Passeriformes
Family:	Sylviidae
Genus:	Locustella
Species:	L. fluviatilis
Binomial name
Locustella fluviatilis (Wolf, 1810)

The River Warbler, Locustella fluviatilis, is an Old World warbler in the grass warbler genus Locustella. It breeds in east and central Europe into western Asia. It is migratory, wintering in east Africa.

This small passerine bird is a species found in dense deciduous vegetation close to water in bogs or near a river. 5-7 eggs are laid in a nest in a tussock or on the ground. This species is a rare vagrant to western Europe.

This is a largish warbler. The adult has an 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 young birds are yellower below. Like most warblers, it is insectivorous.

This is a skulky species which is very difficult to see except sometimes when singing. It creeps through grass and low foliage.

The song is a monotonous mechanical insect-like reeling, often given at dusk. It is similar to the song of a Grasshopper Warbler, but has more of a sewing machine quality, and may be produced for long periods.

References

• Template:IUCN2006 Database entry includes justification for why this species is of least concern