Tree warblers are medium-sized warblers in the marsh- and tree-warbler family Acrocephalidae. They are found in Europe, Africa and western Asia. Until recently, they were all classified in the single genus Hippolais.
The Acrocephalus warblers are small, insectivorous passerine birds belonging to the genus Acrocephalus. Formerly in the paraphyletic Old World warbler assemblage, they are now separated as the namesake of the marsh and tree warbler family Acrocephalidae. They are sometimes called marsh warblers or reed warblers, but this invites confusion with marsh warbler and reed warbler.
The common reed warbler is an Old World warbler in the genus Acrocephalus. It breeds across Europe into the temperate western Palaearctic where it is migratory, wintering in sub-Saharan Africa. It is also a resident species over large parts of Africa.
The thick-billed warbler breeds in the temperate east Palearctic, from south Siberia to west Mongolia. It is migratory, wintering in tropical South Asia and South-east Asia. It is a very rare vagrant to western Europe.
The western olivaceous warbler, also known as isabelline warbler, is a "warbler", formerly placed in the Old World warblers when these were a paraphyletic wastebin taxon. It is now considered a member of the acrocephaline warblers, Acrocephalidae, in the tree warbler genus Iduna. It was formerly regarded as part of a wider "olivaceous warbler" species, but as a result of modern taxonomic developments, this species is now usually considered distinct from the eastern olivaceous warbler, Iduna pallida.
The eastern olivaceous warbler, known simply as the olivaceous warbler when its western relative is referred to as the 'Isabelline warbler', is a small passerine bird with drab plumage tones, that is native to the Old World. For the most part it breeds in southeastern Europe, the Middle East and adjacent western Asia, and winters in the northern Afrotropics.
Sykes's warbler is an Old World warbler in the tree warbler family. It was formerly considered a subspecies of the booted warbler, but is now considered a full species. Its breeding range is from northeast Arabia to Turkestan, west China and Afghanistan. Like the booted warbler, many populations of the species migrate in winter to the Indian subcontinent as far south as Sri Lanka.
The Tahiti reed warbler is a songbird in the genus Acrocephalus. It used to be placed in the "Old World warbler" assemblage (Sylviidae), but is now in the newly recognized marsh warbler family Acrocephalidae. It is endemic to the island of Tahiti.
The millerbird is a species of Old World warbler in the family Acrocephalidae endemic to the Hawaiian Islands.
The lesser swamp warbler or Cape reed warbler is an Old World warbler in the genus Acrocephalus. It is a resident breeder in Africa from the Democratic Republic of the Congo, the Chad and Ethiopia south to South Africa. This is a common species of reedbeds in standing water.
The speckled reed warbler or streaked reed warbler is an Old World warbler in the family Acrocephalidae. The species was first described by Robert Swinhoe in 1863.
The Grande Comore brush warbler is a species of Old World warbler in the family Acrocephalidae. It is found in Comoros and Mayotte. Its natural habitat is subtropical or tropical moist montane forests.
Nesillas is a genus of Old World warbler in the family Acrocephalidae. Established by Harry Church Oberholser in 1899, it contains the following species:
The southern Marquesan reed warbler is a species of Old World warbler in the family Acrocephalidae.
The northern Marquesan reed warbler is a species of Old World warbler in the family Acrocephalidae. It was formerly considered conspecific with the southern Marquesan reed warbler, and together known as the Marquesan reed warbler. It is found on the northern Marquesas Islands.
Moorea reed warbler is a species of songbird in the genus Acrocephalus. Formerly placed in the "Old World warbler" assemblage (Sylviidae), it is now in the newly recognized marsh warbler family Acrocephalidae. It was once considered a subspecies of the Tahiti reed warbler.
Garrett's reed warbler, sometimes called Society Islands reed warbler or Forster's reed-warbler was a songbird in the genus Acrocephalus. Formerly placed in the "Old World warbler" assemblage (Sylviidae), it is now in the newly recognized marsh warbler family Acrocephalidae. It was endemic to Raiatea and Huahine in the Society Islands.
Iduna is a genus of tree warbler in the family Acrocephalidae. Keyserling and Blasius gave no explanation of the genus name Iduna. It is sometimes lumped in the genus Hippolais, although in 2009 it was found to belong to the Iduna clade.
