Great-billed warbler

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Great-billed warbler
Acrocephalus orinus Tajikistan.jpg

Great-billed warbler ( Acrocephalus orinus )

Systematics
Order : Passerines (Passeriformes)
Subordination : Songbirds (passeri)
Superfamily : Sylvioidea
Family : Reed warbler (Acrocephalidae)
Genre : Reed warbler ( Acrocephalus )
Type : Great-billed warbler
Scientific name
Acrocephalus orinus
Oberholser , 1905

The great-billed reed warbler ( Acrocephalus orinus ) is a very rare songbird from the genus of the reed warbler ( Acrocephalus ) in the reed warbler family (Acrocephalidae). Specimens were discovered only in Asia .

features

The back and shoulder feathers of the 13-14 cm long and 10.5 g heavy reed warbler are simply olive brown, rump and upper tail-coverts have a warmer hue. From the forehead to the nape of the neck, the color is evenly olive brown, also in a slightly warmer shade. On the head there is a short, pale eye stripe that widens towards the pale reins, a dark cheek patch and a short, dark eye stripe. The ear covers are yellowish brown. The chin and throat are whitish. The rest of the underside is whitish with a yellowish-brown tint, especially on the chest, flanks and under tail-coverts. The hand covers, the umbrella feathers and the arm wings are lined with light brown. The control feathers are dark grayish brown, lined with narrow brown and indistinctly lightened at the tips.

The beak is relatively long, the upper bill blackish, the lower bill pink, flesh-colored. The legs are gray-brown. The iris is dull brown.

distribution

Breeding and wintering areas of the great-beaked warbler are not yet fully known. The type specimen was discovered in northern India, the first living individuals were caught about 3,100 km from the type locality in Thailand. Other birds have been spotted in northeast Afghanistan, northern Pakistan, southeast Kazakhstan, West Bengal, southeast Tajikistan, and Myanmar. Possibly the distribution area includes the Hindu Kush , Pamir , Karakoram and West Tian Shan .

Duration

Since its discovery in the Satluj valley in the Indian state of Himachal Pradesh on November 13, 1867, no specimens of this bird species have been found to this day. The World Conservation Union ( IUCN ) complained about the lack of verifiable data in the Red List of Endangered Species for which it is responsible . The bird was considered extinct to date.

In March 2006, the ornithologist Philip Round from Mahidol University in Bangkok discovered a specimen in the sewage field of a sewage treatment plant in the Thai province of Phetchaburi , near the capital Bangkok. This was confirmed by a test of the DNA in the laboratory of the Swedish University of Lund.

Various ornithologists have declared their interest in finding more animals and protecting their local populations in their stock. The current task is to find out more information about possible distribution regions. It is suspected that these are mainly in Thailand and Myanmar .

In the summer of 2009, three Afghan ornithologists managed to track down the rare animals in field studies in the Badachschan province in northeastern Afghanistan . Using nets, the researchers were able to capture and examine more than a dozen of the rare great-beaked warbler. However, because the inhabitants of the region cut down the trees in the birds' habitat, the researchers see the animals in danger.

Systematics

The great-beaked reed warbler was first described by Allan Octavian Hume in 1869 under the scientific name Phyllopneuste macrorhyncha . Two years later it was renamed Acrocephalus macrorhynchus ( Hume , 1871). In 1905 Harry Church Oberholser changed the species name to Acrocephalus orinus , as macrorhyncha was already occupied by Calamoherpe macrorhyncha ( Müller , 1853) and turned out to be a synonym for Acrocephalus stentoreus .

Individual evidence

  1. ^ A b c d Peter Kennerley, David Pearson: Reed and Bush Warblers. Christopher Helm, 2010, ISBN 978-0713660227 , pp. 343-346.
  2. Jump up ↑ a b c Philip D. Round, Bengt Hansson, David J. Pearson, Peter R. Kennerley, Staffan Bensch: Lost and found: the enigmatic large-billed reed warbler Acrocephalus orinus rediscovered after 139 years . Journal of Avian Biology 38, 2007, pp. 133-138, doi : 10.1111 / j.2007.0908-8857.04064x
  3. ↑ a b Vogel rediscovered - after 140 years , dpa / Süddeutsche Zeitung, March 7, 2007
  4. ↑ a b Supposedly extinct bird found in sewage treatment plant , Spiegel Online, March 7, 2007
  5. ↑ Great-beaked reed warbler. Researchers catch extremely rare bird , Spiegel Online, January 25, 2010

literature

Web links

Commons : Big-billed reed warbler ( Acrocephalus orinus )  - Collection of images, videos and audio files