The grass warblers are small passerine birds belonging to the genus Locustella. Formerly placed in the paraphyletic "Old World warbler" assemblage, they are now considered the northernmost representatives of a largely Gondwanan family, the Locustellidae.
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 species are:
- Russet bush warbler, Locustella mandelli
- Javan bush warbler, Locustella montis
- Taiwan bush warbler, Locustella alishanensis
- West Himalayan bush warbler, Locustella kashmirensis
- Spotted bush warbler, Locustella thoracica
- Baikal bush warbler, Locustella davidi
- Chestnut-backed bush warbler, Locustella castanea
- Long-tailed bush warbler, Locustella caudata
- Long-billed bush warbler, Locustella major
- Chinese bush warbler, Locustella tacsanowskia
- Brown bush warbler, Locustella luteoventris
- Benguet bush warbler, Locustella seebohmi
- Timor bush warbler, Locustella timorensis
- Friendly bush warbler, Locustella accentor
- Savi's warbler, Locustella luscinoides
- Pallas's grasshopper warbler, Locustella certhiola
- Middendorff's grasshopper warbler, Locustella ochotensis
- Lanceolated warbler, Locustella lanceolata
- River warbler Locustella fluviatilis
- Gray's grasshopper warbler, Locustella fasciolata
- Sakhalin grasshopper warbler, Locustella amnicola
- Common grasshopper warbler, Locustella naevia
- Styan's grasshopper warbler, Locustella pleskei
- Marsh grassbird, Locustella pryeri
A fossil acrocoracoid from the Late Miocene (about 11 mya) of Rudabánya (NE Hungary) is quite similar to this bone in the present genus (Bernor et al. 2002). Given its rather early age (most Passerida genera are not known until the Pliocene), it is not too certain that it is correctly placed here, but it is highly likely to belong to the Locustellidae, or the Sylvioidea at the least. As the grass warblers are the only known locustellid warblers from Europe, it is still fairly likely that the bone piece belongs to a basal Locustella.
- Drovetski, S.V., Zink, R.M., Fadeev, I.V., Nesterov, E.V., Koblik, Ye.A, Red’kin, Ya.A., and Rohwer, S. 2004. Mitochondrial phylogeny of Locustella and related genera. Journal of Avian Biology 35: 105-110 doi:10.1111/j.0908-8857.2004.03217.x
- Bernor, R.L.; Kordos, L. & Rook, L. (eds): Recent Advances on Multidisciplinary Research at Rudabánya, Late Miocene (MN9), Hungary: A compendium. Paleontographica Italiana 89: 3-36. PDF fulltext
- del Hoyo, J.; Elliot, A. & Christie D. (editors). (2006). Handbook of the Birds of the World. Volume 11: Old World Flycatchers to Old World Warblers. Lynx Edicions. ISBN 84-96553-06-X.
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