Pityriasidae
   HOME

TheInfoList



OR:

The Bornean bristlehead (''Pityriasis gymnocephala''), also variously known as the bristled shrike, bald-headed crow or the bald-headed wood-shrike, is the only member of the
passerine A passerine () is any bird of the order Passeriformes (; from Latin 'sparrow' and '-shaped') which includes more than half of all bird species. Sometimes known as perching birds, passerines generally have an anisodactyl arrangement of their ...
family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...
Pityriasidae and
genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
''Pityriasis''. This enigmatic and vulnerable species is
endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...
to the southeast Asian island of
Borneo Borneo () is the List of islands by area, third-largest island in the world, with an area of , and population of 23,053,723 (2020 national censuses). Situated at the geographic centre of Maritime Southeast Asia, it is one of the Greater Sunda ...
, where it lives in small groups in the
rainforest Rainforests are forests characterized by a closed and continuous tree Canopy (biology), canopy, moisture-dependent vegetation, the presence of epiphytes and lianas and the absence of wildfire. Rainforests can be generally classified as tropi ...
canopy.


Taxonomy

The relationships of this species have been controversial. At times it has been placed in the Prionopidae, the
Cracticidae The Cracticinae, bellmagpies and allies, gathers together 12 species of mostly crow-like birds native to Australasia and nearby areas. Historically, the cracticines – currawongs, Australian magpie and butcherbirds – were seen as a separate ...
, the
Artamidae Artamidae is a family of passerine birds found in Australia, the Indo-Pacific region, and Southern Asia. It includes 24 extant species in six genera and three subfamilies: Peltopsinae (with one genus, '' Peltops''), Artaminae (with one genus con ...
or the
Corvidae Corvidae is a Cosmopolitan distribution, cosmopolitan Family (biology), family of Songbird, oscine passerine birds that contains the crows, ravens, Rook (bird), rooks, magpies, jackdaws, jays, treepies, choughs, and Nutcracker (bird), nutcrackers ...
.Smythies, B.E.; & Davison, G.W.H. (1999). ''The Birds of Borneo''. Natural History Publications (Borneo): Kota Kinabalu. pp.606–608. A more recent suggestion has been to include it in the
Tephrodornithidae The family Vangidae (from ''vanga'', Malagasy for the hook-billed vanga, ''Vanga curvirostris'') comprises a group of often shrike-like medium-sized birds distributed from Asia to Africa, including the vangas of Madagascar to which the family o ...
, a new family that includes '' Hemipus'' and ''
Tephrodornis The woodshrikes are a genus, ''Tephrodornis'', of birds in the family Vangidae. Taxonomy The genus ''Tephrodornis'' was introduced in 1832 by the English naturalist William Swainson with the large woodshrike as the type species. The genus name ...
''.


Description

The Bornean bristlehead is a medium-sized bird, in length. It is mostly black, with bright red thighs, head, throat and neck, and grey ear-coverts. The featherless crown is deep yellow and covered in short, 3–4 mm long,
bristle A bristle is a stiff hair or feather (natural or artificial), either on an animal, such as a pig, a plant, or on a tool such as a brush or broom. Synthetic types Synthetic materials such as nylon are also used to make bristles in items such as b ...
-like skin projections, giving it a bald appearance from afar. This gives the species its common name "bristlehead", genus name ''Pityriasis'' (from Greek, "having
dandruff Dandruff is a skin condition of the scalp. Symptoms include flaking and sometimes mild itchiness. It can result in social or self-esteem problems. A more severe form of the condition, which includes inflammation of the skin, is known as s ...
") and specific name ''gymnocephala'' (from Greek, "bald-headed"). Red flank patches are present in all females and some males, but can be covered by the wings when perched. There is a white wing-patch at the base of the
primaries Primary elections or primaries are elections held to determine which candidates will run in an upcoming general election. In a partisan primary, a political party selects a candidate. Depending on the state and/or party, there may be an "open pri ...
, visible in flight. It has a massive heavy black hooked bill and a short tail, giving it a chunky appearance.Colenutt, Simon. (2002). Little known Oriental bird: Bornean Bristlehead. ''Oriental Bird Club Bulletin 35''. Juveniles have entirely or mostly black thighs, a more orange-red head and neck, orange-red ear-coverts, some red mottling to the underparts, a few red feathers on the crown and undeveloped bristles. It is a noisy species making a variety of unmusical calls, including distinctive high-pitched nasal whining notes interspersed with harsher notes, chattering noises, whistles, honks and chortles.MacKinnon, John; & Phillipps, Karen. (1993). ''A Field Guide to the Birds of Borneo, Sumatra, Java and Bali''. OUP: Oxford.


Distribution and habitat

The bristlehead is
endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...
to the island of
Borneo Borneo () is the List of islands by area, third-largest island in the world, with an area of , and population of 23,053,723 (2020 national censuses). Situated at the geographic centre of Maritime Southeast Asia, it is one of the Greater Sunda ...
where it is widespread, but generally sparse and patchy in occurrence, although it can be locally common. It mainly lives in lowlands, but also occurs in hilly areas up to above mean sea level. It can be found in the canopy of both
primary Primary or primaries may refer to: Arts, entertainment, and media Music Groups and labels * Primary (band), from Australia * Primary (musician), hip hop musician and record producer from South Korea * Primary Music, Israeli record label Work ...
and secondary forests, including
peat swamp forest Peat swamp forests are tropical and subtropical moist broadleaf forests, tropical moist forests where waterlogged soil prevents dead leaves and wood from fully decomposing. Over time, this creates a thick layer of acidic peat. Large areas of th ...
s, mixed
dipterocarp forest Dipterocarpaceae is a family of flowering plants with 22 genera and about 695 known species of mainly lowland tropical forest trees. Their distribution is pantropical, from northern South America to Africa, the Seychelles, India, Indochina, Indo ...
s and
mangrove forest Mangrove forests, also called mangrove swamps, mangrove thickets or mangals, are productive wetlands that occur in coastal intertidal zones. Mangrove forests grow mainly at tropical and subtropical latitudes because mangrove trees cannot withsta ...
s.


Behaviour

The Bornean bristlehead is a sociable species which often moves steadily in small garrulous flocks of up to 10 birds in the mid and upper canopy of the forest, sometimes accompanied by other large or medium-sized forest birds such as
malkoha Malkohas are large birds in the cuckoo family Cuculidae. The group name is derived from the Sinhala language, Sinhala word for the red-faced malkoha; meaning flower-cuckoo. These are all tropical species. {, class="wikitable" , - ! Image ...
s, babblers,
drongo A drongo is a member of the family Dicruridae of passerine birds of the Old World tropics. The 28 species in the family are placed in a single genus, ''Dicrurus''. Drongos are mostly black or dark grey, short-legged birds, with an upright stan ...
s,
trogon The trogons and quetzals are birds in the order Trogoniformes which contains only one family, the Trogonidae. The family Trogonidae contains 49 species in seven genera. The fossil record of the trogons dates back 49 million years to the Ear ...
s,
woodpecker Woodpeckers are part of the bird family (biology), family Picidae, which also includes the piculets, wrynecks and sapsuckers. Members of this family are found worldwide, except for Australia, New Guinea, New Zealand, Madagascar and the extreme ...
s and
hornbill Hornbills are birds found in tropical and subtropical Africa, Asia and Melanesia of the family Bucerotidae. They are characterized by a long, down-curved bill which is frequently brightly coloured and sometimes has a horny casque on the upper ...
s in
mixed-species feeding flock A mixed-species feeding flock, also termed a mixed-species foraging flock, mixed hunting party or informally bird wave, is a flock of usually insectivorous birds of different species that join each other and move together while foraging. These ar ...
s. Its movements in the canopy are slow and heavy and it flies with a fast, shallow wing-beat.


Feeding

Bornean bristleheads feed primarily on animal prey, mainly large insects and other
arthropod Arthropods ( ) are invertebrates in the phylum Arthropoda. They possess an arthropod exoskeleton, exoskeleton with a cuticle made of chitin, often Mineralization (biology), mineralised with calcium carbonate, a body with differentiated (Metam ...
s, but also small vertebrates like lizards and frogs. Prey is
gleaned Gleaning is the act of collecting leftover crops in the field after harvest. During harvest, there is food that is left or missed often because it does not meet store standards for uniformity. Sometimes, fields are left because they were not ec ...
from foliage, twigs, branches and trunks at canopy to mid-levels of the forest. It occasionally take fruits.


Breeding

Breeding behaviour is largely unknown, though an oviduct egg was described as being white with grey and brown spots and with dimensions of 31 x 25 mm. A sighting of two apparent females feeding a fledgling has been interpreted as suggesting communal breeding. Birds have also been seen in flight carrying nesting material.


Conservation

The Bornean bristlehead is considered vulnerable due to the rapid and ongoing
deforestation Deforestation or forest clearance is the removal and destruction of a forest or stand of trees from land that is then converted to non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban use. Ab ...
in Borneo, along with burning of peat swamp forest. The principal habitat of the species is Borneo's lowland forests, where an estimated 2.5% is lost each year (based on reviews covering 2015–2020). It occurs in a number of protected areas, but some of these are also targeted by
illegal logging Illegal logging is the harvest, transportation, purchase, or sale of timber in violation of laws. The harvesting procedure itself may be illegal, including using corrupt means to gain access to forests; extraction without permission, or from a p ...
.


References

{{Taxonbar, from=Q767088 Endemic birds of Borneo Birds described in 1835