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{{Taxobox
| name = Palm Cockatoo
| status = LC | status_system = IUCN3.1 
| image = Probosciger aterrimus -Melaka Zoo-8a-2c.jpg
| image_width = 300px
| image_caption =At [[Melaka Zoo]], Malaysia
| regnum = [[Animal]]ia
| phylum = [[Chordata]]
| classis = [[Aves]]
| ordo = [[Psittaciformes]]
| familia = [[Cacatuidae]]
| subfamilia = '''Microglossinae'''
| genus = '''''Probosciger'''''
| genus_authority = [[Heinrich Kuhl|Kuhl]], 1820
| species = '''''P. aterrimus'''''
| binomial = ''Probosciger aterrimus''
| binomial_authority = [[Johann Friedrich Gmelin|Gmelin]], 1788
| subdivision_ranks = subspecies
| subdivision = ''P. a. aterrimus''<br />
''P. a. goliath''<br />
''P. a. macgillivrayi''<br />
''P. a. stenolophus''
| range_map = Bird range palm cockatoo.png
| range_map_width = 225px
| range_map_caption = Australian Palm Cockatoo range (in red)
}}
The '''Palm Cockatoo''' ''(Probosciger aterrimus)'', also known as the '''Goliath Cockatoo''', is a large smoky-grey or black [[Psittaciformes|parrot]] of the [[cockatoo]] family. It is the only member in subfamily Microglossinae and the only member of the monotypic genus, '' Probosciger''. Its unique position within the cockatoo family has been confirmed by molecular studies.

The Palm Cockatoo is distributed in rainforests and woodlands of [[New Guinea]] and northern [[Queensland]], [[Australia]]. A majority of all captive-bred Palm Cockatoos are currently owned by Natalie Copp, David Roberts, Mike Tyson, Thomas Woodward and Ina Zuncke. The collective breeding program has been deemed a success by the Palm Cockatoo Conservation in Papua New Guinea.<ref>http://www.parrots.org/pdfs/our_publications/psittascene/excerpts/palm_cockatoo/Pages%20from%2002May51.pdf</ref>

== Taxonomy ==
The Palm Cockatoo was originally described by German naturalist  [[Johann Friedrich Gmelin|Gmelin]] in 1788. Its specific name ''aterrimus'' is the [[Latin]] superlative adjective for ''ater'' "black", hence "very black" or "blackest". It is the earliest offshoot from the ancestors of what have become the cockatoo family.<ref name=BrownToft>{{cite journal |author=Brown DM, Toft CA|year=1999 |title=Molecular systematics and biogeography of the cockatoos (Psittaciformes: Cacatuidae) |journal=[[Auk (journal)|Auk]] |volume=116|issue=1 |pages=141–57|issn=0004-8038}}</ref>

== Description ==
[[దస్త్రం:Probosciger aterrimus-20030511.jpg|left|thumb|At [[Jurong Bird Park]], Singapore]]
The Palm Cockatoo is 55–60&nbsp;cm (22–24&nbsp;in) in length and weighs 910–1,200&nbsp;g.<ref name="Forshaw (2006). plate 1.">Forshaw (2006). plate 1.</ref> It is a distinctive [[Aves|bird]] with a large [[Crest (bird)|crest]] and has one of the largest bills of any parrots (only the [[Hyacinth Macaw]]'s is larger). This powerful bill enables Palm Cockatoos to eat very hard nuts and seeds that other species have difficulty accessing. The bill is unusual as the lower and upper mandibles do not meet for much of its length, allowing the tongue to hold a nut against the top mandible while the lower mandible works to open it. The Palm Cockatoo also has a distinctive red cheek patch that changes colour when the bird is alarmed or excited. 

== Behaviour ==
=== Calls ===
The Palm Cockatoo makes over 20 different kinds of vocalisations, including a "hellow" call that is surprisingly human-like. Christina Zdenek, graduate research student at The Australian National University, is using their calls to develop a non-invasive technique (called vocal individuality) to identify and 'mark' individual wild palm cockatoos to track over time [http://fennerschool.anu.edu.au/people/pgstudents/zdenekc.php]. 
There are distinct dialects throughout the species' range. It has a unique territorial display where the bird (typically the male) drums with a large (i.e. up to 1" diameter, 15&nbsp;cm long) stick or seed-pod against a dead bough or tree, creating a loud noise that can be heard up to 100&nbsp;m away. [http://www.australiangeographic.com.au/journal/news-palm-cockatoos-drum-to-their-own-beat.htm] It is possible that females can assess the durability of the nesting hollow by the resonance of this drumming display.{{Citation needed|date=April 2010}}
The male then strips the stick into small pecies to line the nest.{{Citation needed|date=April 2010}}

=== Breeding ===
Palm Cockatoos only lay one egg every second year and have one of the lowest breeding success rates reported for any species of parrot.<ref name=Murph03>{{cite journal|author=Murphy S, Legge S, Heinsohn R|title=The breeding biology of palm cockatoos (''Probosciger aterrimus''): a case of a slow life history|journal=Journal of Zoology|year=2003|volume=261|pages=327–39|doi=10.1017/S0952836903004175}}</ref> Off-setting this is their very long life-span. A male commenced breeding at age 29 in Taronga Zoo in Sydney, and a female at the London Zoo was 40 when she laid he first egg in 1966. There is anecdotal evidence of a Palm Cockatoo reaching 80 or 90 years of age in an Australian zoo,<ref name=Murph03/> although the oldest confirmed individual was aged 56 in [[London Zoo]] in 2000.<ref name=Brouwer2000>{{cite journal|author=Brouwer K, Jones M, King C, Schifter H|title=Longevity records for Psittaciformes in captivity|journal=International Zoo Yearbook|year=2000|volume=37|pages=299–316|doi=10.1111/j.1748-1090.2000.tb00735.x}}</ref> Breeding takes place inside tree hollows, which are typically like standing pipes. Fires play an important role in the destruction and creation of nest hollows. Fires allow the colonisation of microorganisms and termites, which enter the tree and start hollowing out the inside. Cyclones are important in the final stage of nest hollow development.

== Status ==
The Palm Cockatoo is still relatively common in [[Cape York Peninsula|Cape York]], but is threatened there by [[habitat (ecology)|habitat]] loss, particularly bauxite mining around Weipa and altered fire regimes elsewhere. Palm Cockatoos are hunted in New Guinea. This species is in high demand for the pet trade due to its unusual appearance. The Palm Cockatoo is currently evaluated as Least Concern on the [[IUCN Red List]] of Threatened Species. It is listed on Appendix I of [[CITES]].

[[దస్త్రం:Probosciger aterrimus -head -captivity-8.jpg|right|thumb|Upper body]]

== References ==
{{Reflist}}
* {{IUCN2008|assessors=[[BirdLife International]]|year=2008|id=142429/0|title=Probosciger aterrimus|downloaded=18 December 2009}}
* '''Murphy''' S.A., '''Double''' M.C. and '''Legge''' S.M. (2007) The phylogeography of palm cockatoos, ''Probosciger aterrimus'', in the dynamic Australo-Papuan region. '''Journal of Biogeography''' 34: 1534–1545.
* '''Murphy''' S.A. and '''Legge''' S.M. (2007) The gradual loss and episodic creation of Palm Cockatoo (''Probosciger aterrimus'') nest-trees in a fire- and cyclone-prone habitat. ''Emu'' 107: 1–6.

== Cited texts ==
* {{Cite book |first=Joseph M. |last=Forshaw | authorlink=Joseph Forshaw |title=Parrots of the World; an Identification Guide|others =Illustrated by [[Frank Knight (artist)|Frank Knight]]|publisher=[[Princeton University Press]] |isbn=0691092516 |page= |nopp = yes| year=2006 }}

== External links ==
* [http://www.birdlife.org/datazone/species/index.html?action=SpcHTMDetails.asp&sid=1389&m=0 BirdLife Species Factsheet]
* {{IUCNlink|142429|IUCN Red List}}
* [http://www.palmcockatoo.com/ The Palm Cockatoo Research Project.]
* [http://www.rspb.org.uk/birds/advice/endangeredspecies/threats.asp Royal Society for the Protection of Birds (RSPB) website – Threats to wild bird populations]
* [http://www.cites.org/eng/resources/species.html CITES website search page]

{{commons|Probosciger aterrimus}}
{{Cockatoos}}

[[వర్గం:Cacatuidae]]
[[వర్గం:Subfamilies of birds]]
[[వర్గం:Genera of birds]]
[[వర్గం:Birds of Australia]]
[[వర్గం:Birds of Southeast Asia]]
[[వర్గం:Birds of Indonesia]]
[[వర్గం:Birds of Papua New Guinea]]
[[వర్గం:Birds kept as pets]]
[[వర్గం:Talking birds]]

[[en:Palm Cockatoo]]
[[ar:ببغاء النخيل]]
[[az:Qara palma kakadusu]]
[[be:Какаду чорны пальмавы]]
[[be-x-old:Какаду чорны пальмавы]]
[[br:Kaketou-palmez]]
[[ca:Cacatua negra]]
[[cs:Kakadu arový]]
[[de:Palmkakadu]]
[[eo:Plejnigra kakatuo]]
[[es:Probosciger aterrimus]]
[[eu:Probosciger aterrimus]]
[[fi:Palmukakadu]]
[[fr:Cacatoès noir]]
[[he:קקדו דקלים]]
[[hu:Pálmakakadu]]
[[id:Kakatua Raja]]
[[it:Probosciger aterrimus]]
[[ja:ヤシオウム]]
[[lt:Juodoji palminė kakadu]]
[[ms:Kakaktua Palma]]
[[nl:Zwarte kaketoe]]
[[nn:Palmekakadu]]
[[pl:Żałobnica palmowa]]
[[pnb:کالا کوکاٹو]]
[[pt:Cacatua-das-palmeiras]]
[[ru:Чёрный какаду]]
[[simple:Palm Cockatoo]]
[[sk:Probosciger]]
[[sv:Palmkakadua]]
[[th:นกกระตั้วดำ]]
[[tr:Palmiye kakadusu]]
[[uk:Чорнодзьобі какаду]]
[[zh:棕树凤头鹦鹉]]