Falkland wren

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Falkland wren
Cobb's Wren.png

Falkland wren ( Troglodytes cobbi )

Systematics
Order : Passerines (Passeriformes)
Subordination : Songbirds (passeri)
Superfamily : Certhioidea
Family : Wrens (Troglodytidae)
Genre : Troglodytes
Type : Falkland wren
Scientific name
Troglodytes cobbi
( Chubb, C , 1909)

The Falkland wren ( Troglodytes Cobbi ) is a bird art from the family of wrens (Troglodytidae) provided on the Falkland Islands endemic is. The stock is on the IUCN as endangered ( Vulnerable estimated). The species is considered to be monotypical .

features

The Falkland wren reaches a body length of about 13.0 to 14.0 cm with a weight of about 17.0 to 20.0 g. Parts of the plumage may show signs of albinism e.g. B. with white and gray on the head. This is not so rare. The reins , the cheeks and the ear covers are gray-brown without any markings. So he has no obvious eye streak . The top of the head and the shoulders are adorned with a warm brown. The rump is lighter rust-brown. The outer flags of the hand and arm wings are decorated with blackish gray and warm brown. The control feathers are colored warm brown and have tight blackish gray bands. The underside is gray-brown, lightest in the center of the throat and upper chest. This has a more intense and warmer color on the flanks and rump. The eyes are brown, the beak blackish, the legs dark brown. Both sexes are similar. Young animals appear more colorful than adult birds and have a yellow-brown underside.

Behavior and nutrition

The falconry wren feed mainly on invertebrates. There is no reliable data on its usual prey. He prefers to look for food in tussock , but also in crevices or on seaweed washed up on the beach. One report described that he searched the breeding cave of Magellanic penguins while foraging .

Vocalizations

The song of the Falkland Wren is usually given while sitting on a boulder or hidden in the tussock grass. Usually this is a loud phrase of rapid warblers and whistles that he mixes with some buzzing notes. This takes about two seconds. Different males have different songs that differ in their pattern. This can be slow ten-second intervals or continued trilling, which can last up to twenty seconds. The sounds include harsh humming trills that lighten or staccato-like and explosive tones when disturbed.

Reproduction

Few nests of the Falkland Wren have been described so far. It breeds from September / October to December, but you can hear its song from late August to mid-April. There are very likely two broods per year. It is extremely territorial while it breeds and faithfully returns to the same hatchery each year. The nest is an oval-shaped ball with a side entrance that goes slightly upwards. He builds it out of tussock grass and seal hair and lays it out with thick feathers. Usually it is built on the ground or at least close to the ground. It is a maximum of about 0.9 m above the ground and is attached to the base of the tussock tufts of grass. Occasionally he builds it in crevices or under larger boulders. One of the nests was discovered on a sheep skin hanging over a fence. It lays three to four eggs that are pink in color and heavily covered with red and light brown spots. No data are available on the breeding season and the time until the nestlings fledged.

distribution and habitat

The Falkland wren prefers areas with tussock grass, a very tall and dense plant that is characteristic of the Falkland Islands. Occasionally he stays in areas where there are no immigrant predators. He is also driven to seaweed washed up in the coastal areas.

migration

The Falkland wren is considered to be a resident bird . Smaller train movements between the islands only appear to be to the immediately adjacent islands.

Etymology and history of research

The first description of the Falkland wren was in 1909 by Charles Chubb under the scientific name Troglodytes cobbi . The type specimen was collected by Arthur Frederick Cobb (1877–1973) on the Falkland Islands. As early as 1809, Louis Pierre Vieillot introduced the genus Troglodytes, which was new to science . This name is derived from "trōglē, trōgō κτρωγλη, τρωγω " for "cave, gnaw" and "-dutēs, duō -δυτης, δυω " for "diving, immersing". The species name »cobbi« is dedicated to its collector.

literature

  • Charles Chubb: Mr. Charles Cubb communicated through Dr. R. Bowdler Sharpe , the following description of a new species of Wren from the Falkland Ilands, where it had been discovered by Mr. AF Cobb . In: Bulletin of the British Ornithologists' Club . tape 25 , no. 154 , 1909, pp. 15-16 ( biodiversitylibrary.org ).
  • Edward Clive Dickinson , Leslie K. Overstreet, Robert Jack Dowsett, Murray Duncan Bruce: Priority! The Dating of Scientific Names in Ornithology . Aves Press Limited, Northampton 2012, ISBN 978-0-9568611-1-5 .
  • James A. Jobling: Helm Dictionary of Scientific Bird Names . Christopher Helm, London 2010, ISBN 978-1-4081-2501-4 .
  • Donald Eugene Kroodsma, David Brewer, Christopher J Sharpe in: Josep del Hoyo , Andrew Elliott, Jordi Sargatal , David Andrew Christie , Eduardo de Juana: Cobb's Wren (Troglodytes cobbi) in Handbook of the Birds of the World Alive . Lynx Edicions, Barcelona.
  • Louis Pierre Vieillot: Histoire naturelle des oiseaux de l'Amérique Septentrionale, contenant un grand nombre d'espèces décrites ou figurées pour la première fois . 2 (delivery 18). Chez Desray, Paris 1809 ( biodiversitylibrary.org - 1807-1809).

Web links

Commons : Falkland Wren ( Troglodytes cobbi )  - Collection of images, videos and audio files

Individual evidence

  1. ↑ IOC World Bird List Dapple-throats, sugarbirds, fairy-bluebirds, kinglets, hyliotas, wrens, gnatcatchers
  2. ↑ a b c d e f Donald Eugene Kroodsma u. a.
  3. ↑ a b Charles Chubb, pp. 15-16.
  4. ↑ Louis Pierre Vieillot, pp. 52-56.
  5. ↑ James A. Jobling, p. 391.

Remarks

  1. ↑ Vieillot categorized the house wren ( Troglodytes aedon ) and the reed warbler ( Acrocephalus arundinaceus ) in the new genus.
  2. ↑ For the history of the publication see Edward Clive Dickinson u. a. P. 157.