Biology:Northern cassowary
| Northern cassowary | |
|---|---|
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Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Aves |
| Infraclass: | Palaeognathae |
| Order: | Casuariiformes |
| Family: | Casuariidae |
| Genus: | Casuarius |
| Species: | C. unappendiculatus
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| Binomial name | |
| Casuarius unappendiculatus Blyth, 1860[2]
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| Distribution of the northern cassowary | |
| Synonyms[3] | |
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The northern cassowary (Casuarius unappendiculatus) also known as the one-wattled cassowary, single-wattled cassowary,[2] or golden-necked cassowary, is a large, stocky flightless bird of northern New Guinea. It is one of the three living species of cassowary, alongside the dwarf cassowary and the southern cassowary. It is a member of the superorder Paleognathae.
Taxonomy
Edward Blyth first identified the northern cassowary from a specimen from an aviary located in Calcutta, India , in 1860.[2] It is the most recently discovered of all the cassowary species.[4] The genus name Casuarius is derived from the Malay word kesuari "cassowary", while the species name unappendiculatus refers to the species' single wattle.[5] Officially, there are no subspecies, though some authors list several subspecies.[6][7]
Description
The northern cassowary has a hard and stiff black plumage, blue facial skin and a casque on top of the head. It has a bright red or yellow coloured neck and wattle. The feet are huge and strong with long, dagger-like claw on its inner toe. The sexes are similar in appearance. The male, at 30 to 37 kg (66 to 82 lb), is smaller than the female, at an average of 58 kg (128 lb), making it the fourth heaviest living bird species after the common ostrich, Somali ostrich and the southern cassowary.[2] These birds measure 149 cm (4 ft 10 1⁄2 in) long and stand 1.5–1.8 m (4 ft 11 in–5 ft 11 in) in height.[2] Compared to the southern cassowary, the northern cassowary has a slightly shorter bill, at 12 to 13.7 cm (4.7 to 5.4 in), but a slightly longer tarsal length, at 28 to 33.2 cm (11.0 to 13.1 in).[2]
Phylogeny
Northern cassowaries are members of the family Casuariidae, of which there are only four extant members. Three of being the Cassowaries; the other the last remaining extant species of emu. All present superficial similarities, along being large flightless birds. The northern cassowary and the emu share homologous features. For example, both have a blue patch of colour on their face/neck, but the functions of these differ. The emu's patch is of a paler colour and is used as a form of camouflage where it is located. The northern cassowary's patch of blue is brighter, and is used for attracting mates.[citation needed]
An alternate classification was proposed in 2014 by Mitchell et al., based on analysis of mitochondrial DNA. This splits off the Casuariidae into their own order, the Casuariformes, and includes only the cassowaries in the family Casuariidae, placing the emus in their own family, Dromaiidae.
Range and habitat
The northern cassowary is distributed and endemic to coastal swamp and lowland rainforests of northern New Guinea and the islands of Yapen,[8] Batanta and Salawati.[9] They prefer elevations below 490 m (1,610 ft).[2]
| Location | Population | Trend |
|---|---|---|
| Northern Papua New Guinea | Unknown | Declining |
| Yapen | Unknown | Declining |
| Batanta | Unknown | Declining |
| Salawati | Unknown | Declining |
| Waigeo | Unknown | Declining |
| Total | 2,500 to 10,000 | Declining |
Behaviour
As with other cassowaries, the northern cassowary is a shy and solitary bird. Their diet consists mainly of berries,[10] fruits[2] and small animals, such as mice, rats, frogs, snakes, lizards, smaller birds and a variety of small insects and snails. They will eat dead animals when they find them. The young have been observed to eat the feces of the males raising them and clutch mates. Adults will eat their own feces as it often contains undigested fruits.[10] They make grunting and hissing sounds, like other cassowaries.[9]
In the breeding season, the polygamous female lays three to five green eggs on a well camouflaged nest prepared by the male; she then leaves the nest and eggs to find another mate. The male incubates the eggs and raises the chicks alone for about nine months.
Conservation
Although subject to ongoing habitat loss and overhunting in some areas, as of 2017, the northern cassowary is evaluated as Least concern on the IUCN Red List of Threatened Species, as population size estimates suggest that populations are actually larger than previously estimated. However, it is the most threatened of the three extant cassowary types as of 2022.[4] Hunting is still considered the biggest threat.[9] Native people use the bones and eggs, and take the chicks to be raised for meat. As logging opens up more areas of the forest, hunting will be more of a problem.[1][2] Their occurrence range is 186,000 km2 (72,000 sq mi) and a 2000 estimate placed their numbers at 9300.[9]
References
Notes
- ↑ 1.0 1.1 BirdLife International (2017). "Casuarius unappendiculatus". IUCN Red List of Threatened Species 2017: e.T22678114A118134784. doi:10.2305/IUCN.UK.2017-3.RLTS.T22678114A118134784.en. https://www.iucnredlist.org/species/22678114/118134784. Retrieved 19 November 2021.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Davies, S. J. J. F. (2003)
- ↑ Peron, Richard. "Taxonomy of the Genus Casuarius". http://www.perron.eu/Publications/All%20cassowaries.html.
- ↑ 4.0 4.1 "Cassowary". 2022. https://animals.sandiegozoo.org/animals/cassowary.
- ↑ Gotch, A. F. (1995)
- ↑ Avibase
- ↑ Brands, S. (2008)
- ↑ Clements, J (2007)
- ↑ 9.0 9.1 9.2 9.3 9.4 BirdLife International (2008)(a)
- ↑ 10.0 10.1 "Casuarius unappendiculatus (Northern cassowary)". https://animaldiversity.org/accounts/Casuarius_unappendiculatus/.
Sources
- "Casuarius unappendiculatus". Avibase. https://avibase.bsc-eoc.org/species.jsp?lang=EN&avibaseid=32E7303BCA959B16.
- BirdLife International (2008). "Northern Cassowary - BirdLife Species Factsheet". Data Zone. http://www.birdlife.org/datazone/species/index.html?action=SpcHTMDetails.asp&sid=6&m=0.
- Brands, Sheila (14 August 2008). "Systema Naturae 2000 / Classification, Casuarius unappendiculatus". Project: The Taxonomicon. http://sn2000.taxonomy.nl/Main/Classification/51274.htm.
- Clements, James (2007). The Clements Checklist of the Birds of the World (6th ed.). Ithaca, NY: Cornell University Press. ISBN 978-0-8014-4501-9.
- Davies, Stephen (2002). Ratites and Tinamous. Oxford University Press. ISBN 978-0-19-854996-3.
- Davies, S.J.J.F. (2003). "Cassowaries". in Hutchins, Michael. Grzimek's Animal Life Encyclopedia. 8 Birds I Tinamous and Ratites to Hoatzins (2nd ed.). Farmington Hills, MI: Gale Group. pp. 75–77, 80. ISBN 0-7876-5784-0.
- Gotch, A.F. (1995). "Cassowaries". Latin Names Explained. A Guide to the Scientific Classifications of Reptiles, Birds & Mammals. London: Facts on File. pp. 178–179. ISBN 0-8160-3377-3.
External links
- BirdLife species factsheet for Casuarius unappendiculatus
- "Northern cassowary media". Internet Bird Collection. http://www.hbw.com/ibc/species/northern-cassowary-casuarius-unappendiculatus.
- Northern cassowary photo gallery at VIREO (Drexel University)
Wikidata ☰ Q843182 entry
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