Plain glasses bird

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Plain glasses bird
Zosterops hypolais.jpg

Plain- eyed bird ( Zosterops hypolais )

Systematics
Order : Passerines (Passeriformes)
Subordination : Songbirds (passeri)
Superfamily : Sylvioidea
Family : Spectacled birds (Zosteropidae)
Genre : Zosterops
Type : Plain glasses bird
Scientific name
Zosterops hypolais
Hartlaub & Finsch , 1872

The simple- eyed bird ( Zosterops hypolais ) is a species of bird from the spectacle bird family . It is endemic to the West Carolina island of Yap .

features

The simple-eyed bird reaches a size of 10.5 centimeters. The upper head feathers are often bristled and make the head appear large in profile. The plumage is greenish-gray on the upper side and a little greenish on the upper head and on the upper tail-coverts. An indistinct, narrow, gray-white rein line runs from the corner of the beak to the eye and is bordered by a dark gray longitudinal line. A very narrow white eye ring runs around the eyes. The balance and control feathers are black-brown with olive-green outer edges. The throat, the upper chest, the middle of the abdomen and the under tail covers are yellowish. The flanks are washed out pale gray-yellow. The iris is white. The beak is reddish brown with a lighter base of the lower mandible. The feet are dark gray. The sexes look the same. The young birds have not yet been described. The singing consists of short, chirping “chee-twee-chulip” phrases. The call includes trilling “chee” tones and whirring “zee-up” tones.

habitat

The simple-eyed bird inhabits different habitats from the canopy of rainforests to open savannas. At the edge of the jungle, it is usually in the undergrowth.

Way of life

His way of life is so far little described. It goes in search of food in small groups, whereby the movements of the birds are more inconspicuous, slower and more deliberate than the related spectacled species. The groups often stay where the grass is less than a meter high. Little is known about reproduction. So far, a grass nest in the fork of a tree on the edge of a dense forest has been discovered three meters above the ground.

Existence and endangerment

The plain-eyed bird is very common in the forested areas of the island of Yap. In 1984 between two and fifteen specimens per 100 m of forest area were counted. Since then, the inventory has been stable at around 86,900 copies. It is on the IUCN's pre-warning list ( near threatened ) because it occurs in a very small area and an accidental introduction of predators such as the brown night tree snake ( Boiga irregularis ) cannot be ruled out.

literature

  • Joseph Del Hoyo, Andrew Elliot, David A. Christie (Eds.): Handbook of the Birds of the World. Volume 13: Penduline-Tits to Shrikes. Lynx Edicions, Barcelona 2008, ISBN 978-84-96553-45-3 .

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