Bornean bristlehead (Pityriasis gymnocephala)

loading
Adult Bornean bristlehead resting on a branch
IUCN Red List species status – Near Threatened NEAR
THREATENED

Top facts

  • An unusual-looking bird, the Bornean bristlehead is named for the strange yellow-orange skin growths on top of its head.
  • The Bornean bristlehead has a disproportionately large, hooked bill, which adds to the bird’s top-heavy appearance.
  • Although most of its plumage is black, the Bornean bristlehead has a striking red head and thighs.
  • The Bornean bristlehead is a sociable bird which is typically seen in noisy flocks.
loading
Loading more images and videos...

Bornean bristlehead fact file

Bornean bristlehead description

KingdomAnimalia
PhylumChordata
ClassAves
OrderPasseriformes
FamilyPityriaseidae
GenusPityriasis (1)

The Bornean bristlehead (Pityriasis gymnocephala) is an enigmatic bird, meriting not only its own genus, but also its own family (Pityriaseidae) (2).

The bald crown of the Bornean bristlehead is endowed with extraordinary yellow-orange skin growths. In addition to this, the feathers of the lower throat are bristly and the feathers of the grey ear-coverts are of the same stiff texture. The common name of this species is taken from these highly unusual features (3) (4) (5).

Although the Bornean bristlehead is a medium-sized passerine, its black bill is disproportionately large and is hooked at the tip (2) (3) (4). The thick-set body and short tail give the Bornean bristlehead a top-heavy appearance (6). Although the Bornean bristlehead is mostly blackish in plumage, its face, throat, nape and thighs are bright red (3) (4) (5). A white patch is also visible on the wing when the bird is in flight (3).

Male and female Bornean bristleheads differ slightly in appearance, with the black flanks of the male being spotted with red in the female (3) (4). Juvenile Bornean bristleheads also show some differences from the adult birds. The thighs of the juvenile are black rather than red, and the ear-coverts are red instead of grey. In addition to this, the bristles of the head are undeveloped (3) (7).

The Bornean bristlehead makes a very wide and distinctive variety of calls. This species is highly sociable and the most frequently heard vocalisation is a nasal, whining contact call made as individuals of a flock communicate. A ‘pit-pit-peeoo’ call is also heard very often between members of a group. In addition, flock members sometimes whistle to each other, with every individual giving a single loud whistling call within the space of two to three seconds (3) (7).

Also known as
bald-headed crow, bald-headed wood-shrike, bristled shrike, bristled starling, bristlehead.
Synonyms
Barita gymnocephala.
Size
Length: 22 - 26 cm (2)
Weight
115 - 150 g (2)
Top

Bornean bristlehead biology

The Bornean bristlehead is rarely encountered and is considered to be uncommon even in prime habitat. The apparent scarcity of this species may, in part, be explained by the tendency of flocks to range over large areas (6). This behaviour suggests that the Bornean bristlehead is nomadic in nature, maintaining large home ranges (10).

As a naturally gregarious species, the Bornean bristlehead is usually encountered in flocks of six to ten birds. It moves slowly through its lowland rainforest habitat in an ungainly fashion (3). Flocks of the Bornean bristlehead often associate with other large forest birds, notably the black magpie (Platysmurus leucopterus) (7).

These flocks of Bornean bristleheads spend much of their time searching leaves and tree trunks for invertebrate prey (3). Caterpillars, cicadas, beetles and other large insects are the principle sources of food for the Bornean bristlehead (2) (3) (7). Occasionally, small reptiles and amphibians are also taken as prey (2). Although the Bornean bristlehead has been seen to feed on fruit, this is considered to be a small part of the overall diet (3).

The breeding biology of the Bornean bristlehead remains a mystery, with very little information known (3). Although the nest of this species has never been found, there is a description of an egg taken from a female specimen that was collected in 1896. This egg was largely white with grey and brown spots (11). Evidence of breeding, such as carrying of nesting material, has been observed in May, August and October (3) (7), suggesting that this species may have quite an extended breeding season (3). However, further fieldwork is necessary to unearth the exact details of this aspect of the life of the Bornean bristlehead (2).

Top

Bornean bristlehead range

As its name suggests, the Bornean bristlehead is endemic to the island of Borneo. Within this range, the species is widespread but patchily distributed below elevations of 600 metres, and occurs locally up to 1,000 metres (2) (8).

Top

Bornean bristlehead habitat

A bird of tropical moist forest, the Bornean bristlehead is typically associated with lowland primary rainforest and peat swamp forest (6) (8) (9). Despite this, it also often inhabits mature secondary and selectively logged forests, as well as coniferous forest, Acacia groves and upland heath forest (‘kerangas’ forest) (2) (9).

The Bornean bristlehead shows a preference for the mid-storey of forest with relatively small trees and dense undergrowth (4).

Top

Bornean bristlehead status

The Bornean bristlehead is classified as Near Threatened (NT) on the IUCN Red List (1).

IUCN Red List species status – Near Threatened

Top

Bornean bristlehead threats

The principal threat to the Bornean bristlehead is habitat loss through deforestation. Destruction of forest in lowland Borneo continues at a rapid rate, including in protected areas. Rates of forest loss in Kalimantan (Indonesia) have been particularly rapid, with illegal logging and land conversion being major threats there (2) (9).

Additionally, the Bornean bristlehead is at risk from forest fires, which similarly destroy available habitat. As this species is tolerant of disturbed forest, these threats may be slightly alleviated. However, habitat destruction remains a major concern for the conservation of the Bornean bristlehead, and the species is believed to be undergoing a population decline (9).

Top

Bornean bristlehead conservation

Although there are no known specific conservation measures currently in place for the Bornean bristlehead, it occurs within several protected areas (9). The Danum Valley Conservation Area, located in Sabah (Malaysia), is one of the Bornean bristlehead’s strongholds. This unusual bird has also been recorded in Lambir Hills National Park and Samunsam Wildlife Sanctuary in Sarawak, Tawau Hills National Park in Sabah, and Ulu Temburong National Park in Brunei (3).

Recommended measures for the conservation of the Bornean bristlehead include surveys to measure its population trends and studies into its exact habitat requirements. It will also be important to work towards protecting the remaining peat swamp forests which it inhabits (9).

View information on this species at the UNEP World Conservation Monitoring Centre.
Top

Find out more

Find out more about the Bornean bristlehead and its conservation:

More information on conservation in Borneo:

Top

Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact:
arkive@wildscreen.org.uk

This species information was authored as part of the ARKive and Universities Scheme.
Top

Glossary

Ear-coverts
The circle of small feathers covering the ear opening of a bird. Also called auriculars.
Endemic
A species or taxonomic group that is only found in one particular country or geographic area.
Genus
A category used in taxonomy, which is below ‘family’ and above ‘species’. A genus tends to contain species that have characteristics in common. The genus forms the first part of a ‘binomial’ Latin species name; the second part is the specific name.
Home range
The area occupied by an animal during routine activities, which is not actively defended.
Invertebrates
Animals with no backbone, such as insects, crustaceans, worms, molluscs, spiders, cnidarians (jellyfish, corals, sea anemones) and echinoderms.
Nape
The back of the neck.
Nomadic
A species which roams irregularly from place to place in search of food and water, without returning to a fixed location.
Passerines
A group of more than 5,000 species of small to medium-sized birds, sometimes known as perching birds or songbirds, which have widely varied plumage and shape. They all have three toes pointing forward and one pointed backward, which assists with perching.
Primary rainforest
Rainforest that has remained undisturbed for a long time and has reached a mature condition.
Secondary forest
Forest that has re-grown after a major disturbance, such as fire or timber harvest, but has not yet reached the mature state of primary forest.
Top

References

  1. IUCN Red List (July, 2013)
    http://www.iucnredlist.org/
  2. del Hoyo, J., Elliott, A. and Christie, D. (2009) Handbook of the Birds of the World. Volume 14: Bush-Shrikes to Old World Sparrows. Lynx Edicions, Barcelona.
  3. Colenutt, S. (2002) Little known Oriental bird: Bornean bristlehead. Oriental Bird Club Bulletin, 35: 75-77.
  4. Ahlquist, J.E., Sheldon, F.H. and Sibley, C.G. (1984) The relationships of the Bornean bristlehead (Pityriasis gymnocephala) and the black-collared thrush (Chlamydochaera jefferyi). Journal für Ornithologie, 125(2): 129-140.
  5. Moyle, R.G., Cracraft, J., Lakim, M., Nais, J. and Sheldon, F.H. (2006) Reconsideration of the phylogenetic relationships of the enigmatic Bornean bristlehead (Pityriasis gymnocephala). Molecular Phylogenetics and Evolution, 39(3): 893-898.
  6. Smythies, B.E. (1960) The Birds of Borneo. Oliver and Boyd, London.
  7. Sheldon, F H., Moyle, R.G. and Kennard, J. (2001) Ornithology of Sabah: history, gazetteer, annotated checklist, and bibliography. Ornithological Monographs, 52: 1-278.
  8. BirdLife International (2001) Threatened Birds of Asia: The BirdLife International Red Data Book. BirdLife International, Cambridge, UK.
  9. BirdLife International - Bornean bristlehead (October, 2012)
    http://www.birdlife.org/datazone/speciesfactsheet.php?id=5868
  10. Witt, C.C. and Sheldon, F.H. (1994) A review of the status and distribution of the Bornean bristlehead. Kukila7(1): 54-67.
  11. Bartlett, W.J. (1896) Egg of Pityriasis gymnocephala. Ibis, 38: 158-159.
X
Close

Image credit

Adult Bornean bristlehead resting on a branch  
Adult Bornean bristlehead resting on a branch

© James Eaton / Birdtour Asia

James Eaton
jameseaton@birdtourasia.com
http://www.birdtourasia.com

X
Close

Link to this photo

ARKive species - Bornean bristlehead (Pityriasis gymnocephala) Embed this ARKive thumbnail link ("portlet") by copying and pasting the code below.

Terms of Use - The displayed portlet may be used as a link from your website to ARKive's online content for private, scientific, conservation or educational purposes only. It may NOT be used within Apps.

Read more about

X
Close

MyARKive

MyARKive offers the scrapbook feature to signed-up members, allowing you to organize your favourite ARKive images and videos and share them with friends.

Play the Team WILD game:

Team WILD, an elite squadron of science superheroes, needs your help! Your mission: protect and conserve the planet’s species and habitats from destruction.

Conservation in Action

Which species are on the road to recovery? Find out now »

Help us share the wonders of the natural world. Donate today!

Blog RSS