These are rather drab brownish warblers usually associated with fairly open grassland, shrubs or marshes. Some are streaked, others plain, all are difficult to view. They are insectivorous.
The most characteristic feature of this group is that the song of several species is a mechanical insect-like reeling which gives rise to the group's scientific name.
Species breeding in temperate regions are strongly migratory.
The nine species are
- Savi's Warbler, Locustella luscinoides
Pallas's Grasshopper Warbler, Locustella certhiola
Middendorf's Grasshopper Warbler, Locustella ochotensis
Lanceolated Warbler, Locustella lanceolata
River Warbler Locustella fluviatilis
Gray's Grasshopper Warbler, Locustella fasciolata
Grasshopper Warbler, Locustella naevia
Styan's Grasshopper Warbler, Locustella pleskei
Japanese Swamp Warbler, Locustella pryeri