Thai National Parks

Birds of Thailand

Species of Thailand

Oriental reed warbler

Binomial name: Acrocephalus orientalis, Coenraad Jacob Temminck & Hermann Schlegel, 1847

The Oriental reed warbler (Acrocephalus orientalis) is a passerine bird of eastern Asia belonging to the reed warbler genus Acrocephalus. It was formerly classified as a subspecies of the great reed warbler (A. arundinaceus) of western Eurasia.

Description

It is a large warbler, 18–20 cm long with a wingspan of 23–26 cm. The plumage is brown above with a paler rump and whitish tips to the tail feathers. The underparts are whitish below, browner on the flanks and undertail-coverts. There are narrow greyish streaks on the throat and breast. It has a dark eyestripe and a whitish stripe above the eye. The fairly long, heavy bill is brownish above and pink below with a bright orange gape. The feet are grey.

It is slightly smaller, slenderer and shorter-winged than the great reed warbler. Its tail is shorter and more square-ended than that of the clamorous reed warbler (A. stentoreus) and it has a slightly longer primary projection and a slightly shorter and thicker bill. The pale tip to the tail separates it from both species.

The song is a mixture of warbling phrases and guttural, croaking notes. It is given from a prominent perch such as the top of a reed stem or bush. The bird also has a loud, harsh chack call.

Distribution and habitat

The breeding range covers southern Siberia, Mongolia, northern, central and eastern China, Korea and Japan. It winters in north-east India and across South-east Asia to the Philippines and Indonesia, occasionally reaching New Guinea and Australia. It has occurred as a vagrant in Israel and Kuwait. It breeds mainly in reedbeds and can also be found in marshes, paddy fields, grassland and scrub where it forages for insects and other invertebrates.

Reproduction

Oriental reed warblers have small breeding territories and can achieve high population densities. The nest is built 1-1.5 metres above the ground among reed stems. Two to six eggs are laid and are incubated for 12 to 14 days. The young birds fledge after 10 to 15 days. Major predators at the nest include the Siberian weasel and snakes of the genus Elaphe.

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Scientific classification

Kingdom
Animalia
Phylum
Chordata
Class
Aves
Order
Passeriformes
Family
Acrocephalidae
Genus
Acrocephalus
Species
Acrocephalus orientalis
Distribution map of Oriental reed warbler, Acrocephalus orientalis in Thailand
  • Amphawa District, Samut Songkhram
  • Ban Laem District, Phetchaburi
  • Ban Lat District, Phetchaburi
  • Ban Phai District, Khon Kaen
  • Ban Phraek District, Phra Nakhon Si Ayutthaya
  • Bang Ban District, Phra Nakhon Si Ayutthaya
  • Bang Len District, Nakhon Pathom
  • Bang Pahan District, Phra Nakhon Si Ayutthaya
  • Bang Phra Non-hunting Area
  • Bang Pu Recreation Centre
  • Bangkok Province
  • Borabue District, Maha Sarakham
  • Bueng Boraped Non-hunting Area
  • Chaloem Rattanakosin National Park
  • Chatturat District, Chaiyaphum
  • Chiang Dao District, Chiang Mai
  • Chiang Saen District, Chiang Rai
  • Doi Inthanon National Park
  • Doi Lo District, Chiang Mai
  • Doi Pha Hom Pok National Park
  • Erawan National Park
  • Hat Yai District, Songkhla
  • Hua Hin District, Prachuap Khiri Khan
  • Huai Chorakhe Mak Reservoir Non-hunting Area
  • Kaeng Krachan National Park
  • Kamphaeng Saen District, Nakhon Pathom
  • Kanthararom District, Sisaket
  • Kantharawichai District, Maha Sarakham
  • Khao Sam Roi Yot National Park
  • Khao Yai National Park
  • Khao Yoi District, Phetchaburi
  • Khemarat District, Ubon Ratchathani
  • Khlong Luang District, Pathum Thani
  • Klaeng District, Rayong
  • Kumphawapi District, Udon Thani
  • Kut Thing Non-hunting Area
  • Laem Pak Bia
  • Mae Ai District, Chiang Mai
  • Mae Mo District, Lampang
  • Mae Taeng District, Chiang Mai
  • Mueang Buriram District, Buriram
  • Mueang Chachoengsao District, Chachoengsao
  • Mueang Chiang Mai District, Chiang Mai
  • Mueang Chonburi District, Chonburi
  • Mueang Chumphon District, Chumphon
  • Mueang Khon Kaen District, Khon Kaen
  • Mueang Krabi District, Krabi
  • Mueang Lampang District, Lampang
  • Mueang Maha Sarakham District, Maha Sarakham
  • Mueang Nan District, Nan
  • Mueang Nong Khai District, Nong Khai
  • Mueang Nonthaburi District, Nonthaburi
  • Mueang Pattani District, Pattani
  • Mueang Phayao District, Phayao
  • Mueang Phetchaburi District, Phetchaburi
  • Mueang Phitsanulok District, Phitsanulok
  • Mueang Phuket District, Phuket
  • Mueang Ratchaburi District, Ratchaburi
  • Mueang Samut Sakhon District, Samut Sakhon
  • Mueang Songkhla District, Songkhla
  • Mueang Suphanburi District, Suphan Buri
  • Mueang Tak District, Tak
  • Mueang Uttaradit District, Uttaradit
  • Non Thai District, Nakhon Ratchasima
  • Nong Bong Khai Non-hunting Area
  • Nong Han Lake
  • Nong Suea District, Pathum Thani
  • Nong Waeng Non-hunting Area
  • Pak Chong District, Nakhon Ratchasima
  • Pak Phli District, Nakhon Nayok
  • Pak Thale
  • Phra Nakhon Si Ayutthaya District, Phra Nakhon Si Ayutthaya
  • Pran Buri District, Prachuap Khiri Khan
  • Sai Noi District, Nonthaburi
  • Samut Prakan Province
  • San Sai District, Chiang Mai
  • Sanam Bin Reservoir Non-hunting Area
  • Takua Pa District, Phang Nga
  • Taphan Hin District, Phichit
  • Tha Takiap District, Chachoengsao
  • Tha Wung District, Lopburi
  • Thalang District, Phuket
  • Thale Noi Non-hunting Area
  • Thanyaburi District, Pathum Thani
  • Wang Chan District, Rayong
  • Wat Phai Lom & Wat Ampu Wararam Non-hunting Area

Range map of Acrocephalus orientalis in Thailand

Important note; our range maps are based on limited data we have collected. The data is not necessarily accurate or complete.

Special thanks to Ton Smits, Parinya Pawangkhanant, Ian Dugdale and many others for their contribution for range data.

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