Large-billed Reed Warbler

Large -billed Reed Warbler (Acrocephalus orinus )

The large -billed reed warbler (Acrocephalus orinus ) is a very rare songbird in the genus of warblers (Acrocephalus ) in the family of reed warbler -like ( Acrocephalidae ). Specimens were detected exclusively in Asia.

Features

Back and shoulder feathers of 13-14 cm in length and 10.5 g in weight warbler are plain olive-brown, rump and upper tail-coverts have a warmer color. From the forehead to the neck, the color is uniformly olive-brown, also in a slightly warmer tone. At the top there is a short, pale eyes glancing over the reins to the pale is wider towards a dark cheek patch and a short, dark eye stripe. The ear-coverts are yellowish brown. Chin and throat are whitish. The rest of the underside is whitish with yellowish brown tinge, especially on the breast, flanks and under tail-coverts. The primary coverts, the shield springs and the secondaries are lined light brown. The tail feathers are dark greyish brown, narrow brown lined and lightened indistinct at the tips.

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

Dissemination

Breeding and wintering areas of large -billed warbler are not yet fully known. The type specimen was discovered in northern India, the first living individuals were caught about 3100 km from the type locality located in Thailand. More birds have been spotted in northeast Afghanistan, northern Pakistan, Südostkasachstan, West Bengal, Südosttadschikistan and Myanmar. Perhaps the circulation area covers the Hindu Kush, the Pamirs, the Karakoram and the western Tian Shan.

Stock

Since the discovery in the valley of Satluj in the Indian state of Himachal Pradesh on 13 November 1867 to the present day no specimens of this species were found more. The World Conservation Union ( IUCN), deplored in it is responsible Red List of Endangered Species of the lack of verifiable data. The bird was until now considered extinct.

In March 2006, ornithologist Philip Round, discovered by Mahidol University in Bangkok a copy at a sewage treatment plant sewage farm in Thailand's Phetchaburi province, near the capital, Bangkok. The confirmation of this was a test of DNA in the laboratory of the Swedish University of Lund.

Various ornithologists declared their interest now to find more animals and to protect their local populations in their inventory. It is currently about getting more information about possible dissemination areas in experience. Suspected these are mainly in Thailand and Myanmar.

In summer 2009, succeeded three Afghan ornithologists from field studies in the province of Badakhshan track down the rare animals in the north- east of Afghanistan. With networks, the researchers were able to capture and investigate more than a dozen of the rare large -billed reed warbler. Because the inhabitants of the region cut down trees in the habitat of the birds, the researchers see the animals, however, in danger.

System

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