Boano monarch
| Boano monarch | ||||||||||||
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Boano adult monarch ( Symposiachrus boanensis ) |
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| Scientific name | ||||||||||||
| Symposiachrus boanensis | ||||||||||||
| ( Van Bemmel , 1939) |
The Boano monarch ( Symposiachrus boanensis ) is a rare species of bird belonging to the monarch family . It is endemic to the island of Boano, northwest of Seram , in the southern Moluccas . The Boano monarch was considered a subspecies of the glasses monarch ( Symposiachrus trivirgatus ) until 1995 .
description
It reaches a size of 16 centimeters. The head, top, upper wing and the middle tail feathers are black. The outer tail feathers are white from the center to the tips. The chin and throat are black. The lower side of the cheek, the underside and the under tail-coverts are white. The iris is dark. The beak is grayish blue, the legs are light gray. The forehead shows a white spot. The sexes look the same.
The upper side of immature birds is slate gray. The wings are brownish and the tail is blackish gray. The three outer control springs have white tips. The underside is dull white. The chest is sometimes washed out salmon pink.
voice
His singing consists of a clear tjuuu-tjuuu , followed by a soft, sustained humming trill that subsides after about six seconds. The alarm call is a shrill, shrill and shrill that is repeated continuously for a few seconds.
Habitat and way of life
Little is known about his way of life. He lives in the gorges and valleys of the mountain foothills, dominated by dense semi-evergreen secondary forests, at altitudes of up to 150 m. The stomach contents of one examined specimen contained beetles and the larvae of small invertebrates. The Boano monarch can be observed individually, in pairs or in small family groups. Sometimes it can also be found in mixed flocks of birds. When foraging for food, it moves nimbly through the dense, low undergrowth, the lower layer of trees or through the bamboo thicket.
status
The Boano monarch was only known from the holotype from 1918 for a long time until he was rediscovered on Gunung Tahun in 1991. Observations in 1994 in a 5 hectare forest strip gave an estimate of 5 to 10 individuals. The nature conservation organization BirdLife International estimates the population at 100 to 200 specimens. Due to the progressive destruction of the forests, its habitat has shrunk to an area of presumably only 15% of the original habitat.
literature
- J. Del Hoyo, A. Elliot, J. Sargatal (Eds.) (2006): Handbook of the Birds of the World . Volume 11: Old World Flycatchers to Old World Warblers. Lynx Edicions. ISBN 849655306X
- Erik Hirschfeld: The Rare Birds Yearbook 2008. MagDig Media Ltd., Shrewsbury 2007, ISBN 978-0-9552607-3-5
Web links
- Symposiachrus boanensis in the Red List of Threatened Species of the IUCN 2008. Posted by: BirdLife International, 2008. Accessed on December 20 of 2008.
- BirdLife Species factsheet
- Hokkaido Birdbase: Summary of the available data; engl. pdf (335 kB)