Old World warblers are a large group of birds formerly grouped together in the bird family Sylviidae. They are not closely related to the New World warblers. The family held over 400 species in over 70 genera, and were the source of much taxonomic confusion. Two families were split out initially, the cisticolas into Cisticolidae and the kinglets into Regulidae. In the past ten years they have been the subject of much research and many species are now placed into other families, including the Acrocephalidae, Cettiidae, Phylloscopidae, and Megaluridae. In addition some species have been moved into existing families or have not yet had their placement fully resolved. A smaller number of warblers, together with some babblers formerly placed in the family Timaliidae and the parrotbills, are retained in a much smaller family Sylviidae.
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.
The tawny-flanked prinia is a small passerine bird belonging to the genus Prinia in the family Cisticolidae, a family of Old World warblers. It is widespread and common in most parts of Africa south of the Sahara. The plain prinia of southern Asia was formerly included in this species but is now usually considered to be a separate species.
The bristled grassbird is a small passerine bird in the genus Schoenicola. Also known as the bristled grass warbler, this species is endemic to the Indian subcontinent, where it is patchily distributed in Bangladesh, India, Nepal and Pakistan. These insectivorous birds skulk in dense and tall grasslands, often in marshy areas, habitats that are threatened by human activities. Formerly considered to be sedentary, the species may be migratory, moving south and east in the Indian peninsula during winter and returning to their breeding grounds in the northern plains south of the Himalayas.
The Cape grassbird or Cape grass warbler is an African warbler found in southern Africa. It is the only species placed in the genus Sphenoeacus.
Cincloramphus is a genus of birds in the grassbird family Locustellidae.
The rufous songlark is a species in the family Locustellidae endemic to Australia.
The New Caledonia thicketbird or New Caledonia grassbird, is a bird species. Previously placed in the "Old World warbler" family Sylviidae, it does not seem to be a close relative of the typical warblers; probably it belongs in the grass warbler family Locustellidae. This species is endemic to New Caledonia.
The little grassbird is a species of Old World warbler in the family Locustellidae. It is found in Australia and in West Papua, Indonesia. These sexually monomorphic birds are found in reed beds, rushes, lignum swamps and salt marshes of Southeastern Australia.
The striated grassbird is an "Old World warbler" species in the family Locustellidae. It was formerly placed in the family Sylviidae. It is now the only species placed in the genus Megalurus.
The broad-tailed grassbird is a species of Old World warbler in the family Locustellidae. It is endemic to the Western Ghats of India with a possibility of occurrence in Sri Lanka. A small, mostly brown bird, it has a broad rounded and graduated tail. It is found only on the higher altitude grassy hills where it usually skulks, except during the breeding season when males fly up into the air to sing in their display. The species is believed to be a resident although it is possible that they make local movements.
Locustellidae is a newly recognized family of small insectivorous songbirds ("warblers"), formerly placed in the Old World warbler "wastebin" family. It contains the grass warblers, grassbirds, and the Bradypterus "bush warblers". These birds occur mainly in Eurasia, Africa, and the Australian region. The family name is sometimes given as Megaluridae, but Locustellidae has priority.
The rufous-eared warbler is a species of bird in the family Cisticolidae. It is found in Botswana, Namibia, and South Africa. It is the only species in the genus Malcorus. Its natural habitats are subtropical or tropical dry shrubland and subtropical or tropical dry lowland grassland.
The swamp grass babbler or swamp prinia is a small bird of the Indian subcontinent. Some authorities consider it a subspecies of the rufous-vented grass babbler.
The Papuan grassbird is a species of typical grassbird in the family Locustellidae. The species was once treated as several subspecies of the tawny grassbird, but the two do not interbreed where their ranges are sympatric. The species is endemic to New Guinea and its satellite islands. There are seven subspecies ranging across montane areas of New Guinea, New Britain and New Ireland. It is a fairly large typical grassbird, 20–23 cm (7.9–9.1 in) long and weighing 40 g (1.4 oz).
The Bicol ground warbler is a species of passerine bird in the family Locustellidae. It is endemic to the island of Luzon in the Philippines, where it is found in the southern parts of the island. Along with its other conspecifics, such as the Cordillera ground warbler and the Sierra Madre ground warbler, it is one of the most elusive birds in the country. Its natural habitat is tropical moist lowland forest. It is threatened by habitat loss.
The Guadalcanal thicketbird is a bird species. It used to be placed in the "Old World warbler" family Sylviidae, but it does not seem to be a close relative of the typical warblers; it belongs in the grass warbler family, Locustellidae. It is found on the island of Guadalcanal in the Solomon Islands.
