Showing posts with label Genus Amblyornis. Show all posts
Showing posts with label Genus Amblyornis. Show all posts

Saturday, July 7, 2012

>Amblyornis inornata (Vogelkop Bowerbird)

Vogelkop Bowerbird

 


Vogelkop Bowerbird
Conservation status

Least Concern (IUCN 3.1)
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Aves
Order:Passeriformes
Family:Ptilonorhynchidae
Genus:Amblyornis
Species:A. inornata
Binomial name
Amblyornis inornata
(Schlegel, 1871)
The Vogelkop Bowerbird (Amblyornis inornata), also known as the Vogelkop Gardener Bowerbird, is a medium-sized, bowerbird of the mountains of the Vogelkop Peninsula at Western New Guinea, Indonesia.


Description

The birds are about 25 cm in length, with the females being slightly smaller. They are mainly olive brown in colour, though somewhat paler below, with no ornamental plumage. This makes the species one of the dullest-coloured members of the bowerbird family with, however, one of the largest and most elaborate bowers.

Bower

The bower is a cone-shaped hut-like structure some 100 cm high and 160 cm in diameter, with an entrance usually propped up by two column-like sticks. A front "lawn" of some square meters area is cleaned of debris and laid out with moss. On this, and in the entrance of the bower, decorations such as colourful flowers or fruit, shining beetle elytra, dead leaves and other conspicuous objects are collected and artistically arranged.
Males go to great lengths to ensure that their displays are in prime condition, replacing old items as needed, as well as trying to outdo their neighbours by finding more spectacular decorations, and arranging them appropriately. As opposed to other species of bowerbirds, such as the Satin Bowerbird, there is no fixed preference for items of a certain colour, more important being the "novelty value" of the items instead, which can lead to fashion-like trends if males find rare or unusual items; such rare finds are prime targets for theft by neighboring males. Females visit bowers and, depending on whether they like the "treasure trove" on display, will mate with the attendant males. The bower, indeed the male, play no part in nesting and raising the young.
The songs and mimicry skill of this bird are well known among the indigenous peoples. In September 1872, Odoardo Beccari became the first naturalist to see the home grounds of this bowerbird in the Arfak Mountains of Irian Jaya.
Because of its unadorned and plain plumage, this bowerbird is relatively safe from persecution. A common species within its limited habitat range, the Vogelkop Bowerbird is evaluated as Least Concern on the IUCN Red List of Threatened Species.

>Amblyornis subalaris (Streaked Bowerbird)

Streaked Bowerbird


Streaked Bowerbird
Conservation status

Least Concern (IUCN 3.1)
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Aves
Order:Passeriformes
Family:Ptilonorhynchidae
Genus:Amblyornis
Species:A. subalaris
Binomial name
Amblyornis subalaris
Sharpe, 1884
The Streaked BowerbirdAmblyornis subalaris is a species of bowerbird which can be found in southeastern New Guinea. They are approximately 22 cm long and have an olive-brown colouring. The male has a short orange crest which is not visible unless displayed.
The Streaked Bowerbird is a polygamous species. The nest is built by the male out of sticks. It has a characteristic hut shape with two entrances.

>Amblyornis macgregoriae (MacGregor's Bowerbird)

MacGregor's Bowerbird


MacGregor's Bowerbird
Conservation status

Least Concern (IUCN 3.1)
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Aves
Order:Passeriformes
Family:Ptilonorhynchidae
Genus:Amblyornis
Species:A. macgregoriae
Binomial name
Amblyornis macgregoriae
De Vis, 1890
Synonyms
Loria mariae
The MacGregor's BowerbirdAmblyornis macgregoriae is a medium-sized, up to 26 cm long, olive brown bowerbird of New Guinea's mountain forests, roughly the size and shape of a robin. The male is adorned with an erectile orange yellow crest, that is partly hidden until shown in courtship display. The unadorned female is similar to the male, but without the crest. Superb mimics, they are known for imitating other birds, pigs, rushing water, and even human speech.
The polygamous male builds a tower-like "maypole-type" bower, with a central pole of twigs surrounded by a dish of moss with raised walls approximately 1 meter in diameter. He decorates the twigs of the maypole with flowers, fruits, insects and other objects. The diet consists mainly of fruits and insects. Bowerbirds are positioned roughly in the middle of the continuum of the "transfer effect" phenomenon observed among the different bowerbird species, whereby brilliant plumage evolves to more drab colors, while ornamentation is "transferred" to the behavior of creating elaborate bowers to demonstrate robust health instead.
When a female comes in proximity to the bower, the male struts and calls, and opens his crest to display its full color. Hiding the crest except during sexual display is thought to minimize his vulnerability to predators.
Widespread and common throughout its range, the MacGregor's Bowerbird is evaluated as Least Concern on the IUCN Red List of Threatened Species.

>Amblyornis flavifrons (Golden-fronted Bowerbird)

Golden-fronted Bowerbird


Golden-fronted Bowerbird
Head profile and top of head of the male
Conservation status

Least Concern (IUCN 3.1)
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Aves
Order:Passeriformes
Family:Ptilonorhynchidae
Genus:Amblyornis
Species:A. flavifrons
Binomial name
Amblyornis flavifrons
Rothschild, 1895
The Golden-fronted BowerbirdAmblyornis flavifrons is a medium-sized, approximately 24 cm long, brown bowerbird. The male is rufous brown with an elongated golden crest extending from its golden forehead, dark grey feet and buffish yellow underparts. The female is an unadorned olive brown bird.
An Indonesian endemic, the male builds a tower-like "maypole-type" bower decorated with colored fruit.
Originally described in 1895 based on trade skins, this elusive bird remained a mystery for nearly a hundred years, until January 31, 1981  when the American ornithologist Jared Diamond discovered the home ground of the Golden-fronted Bowerbird at the Foja Mountains in the Papua province of Indonesia.
In December 2005, led by Bruce Beehler, an international team of eleven scientists from the United States, Australia and Indonesia
 traveled to the unexplored areas of Foja Mountains and took the first photographs of the bird .
The Golden-fronted Bowerbird is evaluated as Least Concern on the IUCN Red List of Threatened Species.

>>Genus Amblyornis

Amblyornis


Amblyornis
Streaked Bowerbird, Amblyornis subalaris
Scientific classification
Kingdom:Animalia
Phylum:Chordata
Class:Aves
Order:Passeriformes
Family:Ptilonorhynchidae
Genus:Amblyornis
Elliot, 1872
Species
4, see text
The genus Amblyornis of the family Ptilonorhynchidae consists of four species of bowerbirds endemic to New Guinea.

Species

  • Golden-fronted Bowerbird, Amblyornis flavifrons
  • MacGregor's Bowerbird, Amblyornis macgregoriae
  • Streaked Bowerbird, Amblyornis subalaris
  • Vogelkop Bowerbird, Amblyornis inornata