Satin bowerbird

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Satin bowerbird
Satin Bowerbird at Bower 6533.jpg
Male at bower
Ptilonorhynchus violaceus -Bunya Mountains-8.jpg
Female
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Ptilonorhynchidae
Genus: Ptilonorhynchus
Kuhl, 1820
Species:
P. violaceus
Binomial name
Ptilonorhynchus violaceus
(Vieillot, 1816)

The satin bowerbird (Ptilonorhynchus violaceus) is a bowerbird endemic to eastern Australia.

Contents

A rare natural intergeneric hybrid between the satin bowerbird and the regent bowerbird is known as Rawnsley's bowerbird.

Description

Satin bowerbird in Lamington National Park, Queensland, Australia Satin Bowerbird JCB.jpg
Satin bowerbird in Lamington National Park, Queensland, Australia

Mature males have violet-blue eyes and are uniformly coloured black, however, light diffraction by the surface texture of the feathers results in an almost metallic sheen giving a deep shiny blue appearance. [2] [3] Immature males are coloured and marked the same as females and are often mistaken for them. [2]

Females might be mistaken for the green catbird or spotted catbird with distinctively green/brown or otherwise entirely brown upper body and lighter under body with a distinct reticulated or scalloped pattern, but with very striking blue eyes. [2]

Distribution

The satin bowerbird is common in rainforest and tall moist sclerophyll forest in eastern Australia from southern Queensland to Victoria. There is also an isolated population in the Wet Tropics of north Queensland.

Diet

Like all Ptilonorhynchidae, satin bowerbirds are predominantly frugivorous as adults, though they also eat leaves and a small amount of seeds and insects. [4] As nestlings, however, they are largely fed on beetles, grasshoppers and cicadas until they can fly. [5]

Satin bowerbirds are not in the least finicky in their food preferences, and have taken extremely readily to the numerous plants introduced since European settlement. Indeed, they are a major dispersal agent for a number of weedy plants, such as camphor laurel, the European olive and various species of privet. [6] They are also often persecuted by horticulturalists because they frequently raid fruit and vegetable crops. Satin bowerbirds are aggressive when foraging, frequently attempting to displace other birds from fruit trees. [5]

Courtship

A male building the bower Satin Bowerbird nest.jpg
A male building the bower
Satin bowerbird at his bower Satin Bowerbird at his bower JCB.jpg
Satin bowerbird at his bower

Like all bowerbirds, the satin bowerbird shows highly complex courtship behaviour. Mate choice in satin bowerbirds has been studied in detail. [7] Males build specialised stick structures, called bowers, which they decorate with blue, yellow, and shiny objects, including berries, flowers, snail shells, and plastic items such as ballpoint pens, drinking straws and clothes pegs. As the males mature they use more blue objects than other colours. It is theorized that the preference for blue objects is due to the colour accentuating the plumage of male satin bowerbirds or that the colour blue is more familiar and the designated colour for this species. [8] Females visit these and choose which male they will allow to mate with them. In addition to building their bowers, males carry out intense behavioural displays called dances to woo their mates, but these can be treated as threat displays by the females. Nestbuilding and incubation are carried out by the females alone.

Recent research has shown that female mate choice takes place in three stages:

Experimental manipulations of the ornaments around the bowers have shown that the choices of young females (those in their first or second year of breeding) are mainly influenced by the appearance of the bowers, and hence by the first stage of this process. Older females, which are less affected by the threatening aspect of the males' displays, make their choices more on the basis of the males' dancing displays. It has been hypothesised that as males mature their colour discrimination develops and they are able to select more blue objects for the bower. It is not yet known whether this description would also hold true for other species of bowerbird.

Male satin bowerbirds are known to destroy and steal from the bowers of one another. [9] The quality of a male's own bower does not predict how often they will destroy others. However, males who exhibit more aggression by attacking others at feeding sites tend to destroy competitor bowers more frequently.

Nesting and life cycle

Satin bowerbirds nest between October and February. Typically two eggs but occasionally one or three are laid in a shallow nest of twigs on top of which are placed leaves of Eucalyptus or Acacia . These leaves turn brown as the eggs are laid, and may serve as camouflage. [5] The eggs are cream but streaked with brown, and are much larger than typical for a bird of its size at around 19 grams (0.67 oz); [4] they are laid every other day and hatch asynchronously after 21 days of incubation.

The young are able to fly three weeks after hatching, but remain dependent on the female for another two months, finally dispersing at the beginning of the southern winter (May or June). [5]

Female satin bowerbirds mature at two to three years [4] but males do not reach maturity until seven or eight years when they have moulted completely into their characteristic blue-black adult plumage. The satin bowerbird is the longest-lived passerine with anything approaching high-quality banding data: it is estimated that the average lifespan of the species is around eight or nine years, while the record longevity in the wild of twenty-six years is the greatest for any banded passerine. [10]

Related Research Articles

<span class="mw-page-title-main">Bowerbird</span> Family of birds

Bowerbirds make up the bird family Ptilonorhynchidae. They are renowned for their unique courtship behaviour, where males build a structure and decorate it with sticks and brightly coloured objects in an attempt to attract a mate.

<span class="mw-page-title-main">Great bowerbird</span> Species of bird

The great bowerbird is a common and conspicuous resident of northern Australia, from the area around Broome across the Top End to Cape York Peninsula and as far south as Mount Isa and Townsville. Favoured habitat is a broad range of forest and woodland, and the margins of vine forests, monsoon forest, and mangrove swamps.

<span class="mw-page-title-main">Crimson rosella</span> Species of bird

The crimson rosella is a parrot native to eastern and south eastern Australia which has been introduced to New Zealand and Norfolk Island. It is commonly found in, but not restricted to, mountain forests and gardens. The species as it now stands has subsumed two former separate species, the yellow rosella and the Adelaide rosella. Molecular studies show one of the three red-coloured races, P. e. nigrescens, is genetically more distinct.

<span class="mw-page-title-main">Blue-billed duck</span> Species of bird

The blue-billed duck is a small Australian stiff-tailed duck, with both the male and female growing to a length of 40 cm (16 in). The male has a slate-blue bill which changes to bright-blue during the breeding season, hence the duck's common name. The male has deep chestnut plumage during breeding season, reverting to a dark grey. The female retains black plumage with brown tips all year round. The duck is endemic to Australia's temperate regions, inhabiting natural inland wetlands and also artificial wetlands, such as sewage ponds, in large numbers. It can be difficult to observe due to its cryptic nature during its breeding season through autumn and winter. The male duck exhibits a complex mating ritual. The blue-billed duck is omnivorous, with a preference for small aquatic invertebrates. BirdLife International has classified this species as Least concern. Major threats include drainage of deep permanent wetlands, or their degradation as a result of introduced fish, peripheral cattle grazing, salinization, and lowering of ground water.

<span class="mw-page-title-main">Green catbird</span> Species of bird

The green catbird is a species of bowerbird found in subtropical forests along the east coast of Australia, from southeastern Queensland to southern New South Wales. It is named after its distinctive call which sounds like a cat meowing, although it has also been mistaken for a crying child. The green catbird resembles the spotted catbird, which is found in wet tropical rainforests of Far North Queensland.

<span class="mw-page-title-main">Vogelkop bowerbird</span> Species of bird

The Vogelkop bowerbird, also known as the Vogelkop gardener bowerbird, is a medium-sized beautiful bowerbird of the mountains of West Papua.

<span class="mw-page-title-main">Golden bowerbird</span> Species of bird

The golden bowerbird is a species of bird in the family Ptilonorhynchidae, the bowerbirds. It is endemic to Queensland in Australia, where it is limited to the Atherton region.

<span class="mw-page-title-main">Spotted catbird</span> Species of bird

The spotted catbird is a species of bowerbird (Ptilonorhynchidae) which can be found in north Queensland, the eastern Moluccas and New Guinea. Although it is a member of the bowerbird family it does not build a bower.

<span class="mw-page-title-main">Regent bowerbird</span> Species of bird

The regent bowerbird is a medium-sized, up to 25 cm long, sexually dimorphic bowerbird. The male bird is black with a golden orange-yellow crown, mantle and black-tipped wing feathers. It has yellow bill, black feet and yellow iris. The female is a brown bird with whitish or fawn markings, grey bill, black feet and crown. The name commemorates a prince regent of the United Kingdom.

<span class="mw-page-title-main">MacGregor's bowerbird</span> Species of bird

MacGregor's bowerbird is a medium-sized, up to 26 cm long, olive brown bowerbird of New Guinea's mountain forests, roughly the size and shape of an American Robin or a Eurasian Blackbird. 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.

<i>Ptiloris</i> Genus of birds

The genus Ptiloris consists of four allopatric species of birds in the family Paradisaeidae. These birds of paradise are commonly known as riflebirds, so named for the likeness of their black velvety plumage to the uniform of the Rifle Brigade. Alternatively, the bird's cry is similar to a rifle being fired and hitting its target but a call like this is not commonly reported. They are distributed in the rainforests of New Guinea and Eastern Australia.

<span class="mw-page-title-main">Tooth-billed bowerbird</span> Species of bird

The tooth-billed bowerbird, also known as the stagemaker bowerbird or tooth-billed catbird, is a medium-sized bowerbird. It is a stocky olive-brown bird with brown-streaked buffish white underparts, grey feet, a brown iris and a distinctive serrated bill. Both sexes are similar, but the female is slightly smaller than the male. It is the only member of the genus Scenopoeetes.

<span class="mw-page-title-main">Mate choice</span> Mechanism for evolution

Mate choice is one of the primary mechanisms under which evolution can occur. It is characterized by a "selective response by animals to particular stimuli" which can be observed as behavior. In other words, before an animal engages with a potential mate, they first evaluate various aspects of that mate which are indicative of quality—such as the resources or phenotypes they have—and evaluate whether or not those particular trait(s) are somehow beneficial to them. The evaluation will then incur a response of some sort.

<span class="mw-page-title-main">Spotted bowerbird</span> Species of bird

The spotted bowerbird is a sedentary, mid-sized passerine found across broad parts of the drier habitats of eastern Australia. The species is known for its remarkable behaviours, like many other bowerbirds (Ptilonorynchidae), which include bower building and decorating, courtship displays and vocal mimicry. Spotted bowerbirds are locally common, however, overall the population is thought to be in decline.

<span class="mw-page-title-main">Western bowerbird</span> Species of Australian bird

The western bowerbird is a species of bird in the family Ptilonorhynchidae. The species is a common endemic of Australia. It has a disjunct distribution, occurring in Central Australia and the Pilbara region of Western Australia.

<span class="mw-page-title-main">Satin flycatcher</span> Species of bird

The satin flycatcher is a species of bird in the family Monarchidae. Males stand out with their blue-black feathers contrasting their white bellies, and the females with their bright orange throats. It breeds mostly in south-eastern Tasmania and Australia. It is declining throughout the eastern seaboard due to predation from the introduced Red Fox and habitat loss. It is a vagrant to New Zealand.

<span class="mw-page-title-main">Courtship display</span> Communication to start a relationship with someone or to get sexual contact

A courtship display is a set of display behaviors in which an animal, usually a male, attempts to attract a mate; the mate exercises choice, so sexual selection acts on the display. These behaviors often include ritualized movement ("dances"), vocalizations, mechanical sound production, or displays of beauty, strength, or agonistic ability.

<span class="mw-page-title-main">Rawnsley's bowerbird</span>

Rawnsley's bowerbird, also known as Rawnsley's satin bird or the blue regent, is a rare intergeneric hybrid between a satin bowerbird and a regent bowerbird.

<span class="mw-page-title-main">Structures built by animals</span>

Structures built by non-human animals, often called animal architecture, are common in many species. Examples of animal structures include termite mounds, ant hills, wasp and beehives, burrow complexes, beaver dams, elaborate nests of birds, and webs of spiders.

<span class="mw-page-title-main">Sexual selection in birds</span>

Sexual selection in birds concerns how birds have evolved a variety of mating behaviors, with the peacock tail being perhaps the most famous example of sexual selection and the Fisherian runaway. Commonly occurring sexual dimorphisms such as size and color differences are energetically costly attributes that signal competitive breeding situations. Many types of avian sexual selection have been identified; intersexual selection, also known as female choice; and intrasexual competition, where individuals of the more abundant sex compete with each other for the privilege to mate. Sexually selected traits often evolve to become more pronounced in competitive breeding situations until the trait begins to limit the individual's fitness. Conflicts between an individual fitness and signaling adaptations ensure that sexually selected ornaments such as plumage coloration and courtship behavior are "honest" traits. Signals must be costly to ensure that only good-quality individuals can present these exaggerated sexual ornaments and behaviors.

References

  1. BirdLife International (2018). "Ptilonorhynchus violaceus". IUCN Red List of Threatened Species . 2018: e.T22703679A130219832. doi: 10.2305/IUCN.UK.2018-2.RLTS.T22703679A130219832.en . Retrieved 12 November 2021.
  2. 1 2 3 Richard Schodde; Sonia C. Tidemann; Harry L. Bell (1986). Reader's Digest Complete Book of Australian Birds. p. 589. ISBN   978-0-949819-99-4.
  3. "Satin Bowerbird - Australian Museum". australianmuseum.net.au. Retrieved 2015-06-02.
  4. 1 2 3 Higgins, P.J. and J.M. Peter (editors); Handbook of Australian, New Zealand and Antarctic Birds, Volume 6: Pardalotes to Shrike-thrushes ISBN   978-0-19-553762-8
  5. 1 2 3 4 Rowland, Peter; Bowerbirds, pp. 76-78 ISBN   978-0-643-09582-3
  6. "Satin Bowerbird"
  7. Coleman, S. W.; Patricelli, G. L.; Borgia, G. (2004). "Variable female preferences drive complex male displays". Nature . 428 (6984): 742–745. Bibcode:2004Natur.428..742C. doi:10.1038/nature02419. PMID   15085130. S2CID   2744790.
  8. Santen, Jacquie (28 August 2006). "Thieving bowerbirds like bottle tops best". ABC Science. Retrieved 3 May 2021.
  9. Borgia, Gerald (1985). "Bower destruction and sexual competition in the satin bowerbird (Ptilonorhynchus violaceus)". Behavioral Ecology and Sociobiology. 18 (2): 91–100. Bibcode:1985BEcoS..18...91B. doi:10.1007/BF00299037. ISSN   0340-5443. S2CID   36871646.
  10. Australian Bird and Bat Banding Scheme Satin Bowerbird