The horned guan (''Oreophasis derbianus'') is a large,

turkey Turkey ( tr, Türkiye ), officially the Republic of Türkiye ( tr, Türkiye Cumhuriyeti, links=no ), is a list of transcontinental countries, transcontinental country located mainly on the Anatolia, Anatolian Peninsula in Western Asia, with ...

-like bird native to

Central America Central America ( es, América Central or ) is a subregion of the Americas. Its boundaries are defined as bordering the United States to the north, Colombia to the south, the Caribbean Sea to the east, and the Pacific Ocean to the west. ...

. It is the only

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

in the

genus Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...

''Oreophasis''.

Taxonomy

The

holotype specimen A holotype is a single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several ...

of "''Oreophasis Derbianus'' " G.R. Gray
Gen. Bds., 3, 1844, p.(485).
is held in the collections of

National Museums Liverpool National Museums Liverpool, formerly National Museums and Galleries on Merseyside, comprises several museums and art galleries in and around Liverpool, England. All the museums and galleries in the group have free admission. The museum is a non ...

World Museum World Museum is a large museum in Liverpool, England which has extensive collections covering archaeology, ethnology and the natural and physical sciences. Special attractions include the Natural History Centre and a planetarium. Entry to the ...

, with accession number D210. The specimen was collected from

Volcán de Fuego Volcán de Fuego (; Spanish for "Volcano of Fire", often shortened to Fuego) or Chi Q'aq' ( Kaqchikel for "where the fire is") is an active stratovolcano in Guatemala, on the borders of Chimaltenango, Escuintla and Sacatepéquez departments. ...

, Guatemala by Don Joaquin Quinones circa 1843 and came to the Liverpool national collection via the

13th Earl of Derby Edward Smith-Stanley, 13th Earl of Derby (21 April 1775 – 30 June 1851), KG, of Knowsley Hall in Lancashire (styled Lord Stanley from 1776 to 1832, known as Baron Stanley of Bickerstaffe from 1832-4), was a politician, peer, landowner, bui ...

’s collection which was bequeathed to the people of Liverpool.

Phylogeny

The horned guan is not a true

guan Guan may refer to: * Guan (surname), several similar Chinese surnames ** Guān, Chinese surname * Guan (state), ancient Chinese city-state * Guan (bird), any of a number of bird species of the family Cracidae, of South and Central America * Guan ( ...

, but merely resembles these birds most in overall shape and color, whereas the horn is more reminiscent of the

helmeted curassow The helmeted curassow (''Pauxi pauxi'') or northern helmeted curassow, is a large terrestrial bird in the family Cracidae found in the subtropical cloud-forest in steep, mountainous regions of western Venezuela and northern Colombia. There are t ...

s. In fact, this

is the only survivor of a very ancient lineage of

cracid The chachalacas, guans and curassows are birds in the family Cracidae. These are species of tropical and subtropical Central and South America. The range of one species, the plain chachalaca, just reaches southernmost parts of Texas in the Unit ...

s that has been

evolving Evolution is change in the heritable characteristics of biological populations over successive generations. These characteristics are the expressions of genes, which are passed on from parent to offspring during reproduction. Variation t ...

independently from all other living members of this

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

for at least 20 million years, and possibly as much as 40 million years. Although it does not have any really close relatives among living cracids, the true guans are apparently most ''distant''. Given that the basal relationships of the living cracids are not well resolved, the horned guan is often placed into a distinct

subfamily In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end subfamily botanical names with "-oideae", and zoologi ...

, the Oreophasinae. Alternatively, it might be included in a large Cracinae with

curassow Curassows are one of the three major groups of cracid birds. They comprise the largest-bodied species of the cracid family. Three of the four genera are restricted to tropical South America; a single species of ''Crax'' ranges north to Mexico. ...

s and

chachalaca Chachalacas are galliform birds from the genus ''Ortalis''. These birds are found in wooded habitats in the far southern United States (Texas), Mexico, and Central and South America. They are social, can be very noisy and often remain fairly c ...

s.Pereira et al. 2002

Description

It is approximately long, with glossy black

dorsal Dorsal (from Latin ''dorsum'' ‘back’) may refer to: * Dorsal (anatomy), an anatomical term of location referring to the back or upper side of an organism or parts of an organism * Dorsal, positioned on top of an aircraft's fuselage * Dorsal co ...

plumage, red legs, a white

iris Iris most often refers to: *Iris (anatomy), part of the eye *Iris (mythology), a Greek goddess * ''Iris'' (plant), a genus of flowering plants * Iris (color), an ambiguous color term Iris or IRIS may also refer to: Arts and media Fictional ent ...

, a yellow

bill Bill(s) may refer to: Common meanings * Banknote, paper cash (especially in the United States) * Bill (law), a proposed law put before a legislature * Invoice, commercial document issued by a seller to a buyer * Bill, a bird or animal's beak Plac ...

, and a red horn on top of its head. The breast and upper belly are white, and its long tail feathers are black with a white band near the base. Both sexes are similar. The young are duller with a smaller horn, and have a brown tail and wings.

Distribution and habitat

The horned guan is distributed in humid mountain forests of southeastern

Mexico Mexico (Spanish: México), officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatema ...

(

Chiapas Chiapas (; Tzotzil language, Tzotzil and Tzeltal language, Tzeltal: ''Chyapas'' ), officially the Free and Sovereign State of Chiapas ( es, Estado Libre y Soberano de Chiapas), is one of the states that make up the Political divisions of Mexico, ...

) and

Guatemala Guatemala ( ; ), officially the Republic of Guatemala ( es, República de Guatemala, links=no), is a country in Central America. It is bordered to the north and west by Mexico; to the northeast by Belize and the Caribbean; to the east by H ...

in Central America. It is found at altitudes up to .

Diet

Its diet consists mainly of fruits, green leaves, and invertebrates.

Breeding

The female usually lays one or two eggs. Oreophasis_Gray

Conservation

Due to ongoing

habitat loss Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby ...

, small population size, limited range, and hunting in some areas, the horned guan is evaluated as

Endangered An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and inva ...

on the

IUCN Red List The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is the world's most comprehensive inventory of the global conservation status of biol ...

of Threatened Species. It is listed on Appendix I of

CITES CITES (shorter name for the Convention on International Trade in Endangered Species of Wild Fauna and Flora, also known as the Washington Convention) is a multilateral treaty to protect endangered plants and animals from the threats of interna ...

References

*Pereira, Sérgio Luiz; Baker, Allan J.& Wajntal, Anita (2002): Combined nuclear and mitochondrial DNA sequences resolve generic relationships within the Cracidae (Galliformes, Aves). ''Systematic Biology'' 51(6): 946–958. PDF fulltext

External links

* ttp://aventurasnaturales.tripod.com/sitebuildercontent/sitebuilderpictures/.pond/oreophasis_derbianus.jpg.w560h373.jpg Horned Guan photobr>Article
Aventuras Naturales
Horned Guan image
(Oil paintings)

(for

, three types)
Horned Guan photo gallery
VIREO
Horned Guan videos
on the Internet Bird Collection {{Taxonbar, from1=Q147327, from2=Q1089307

horned guan The horned guan (''Oreophasis derbianus'') is a large, turkey-like bird native to Central America. It is the only species in the genus ''Oreophasis''. Taxonomy The holotype specimen of "''Oreophasis Derbianus'' " G.R. GrayGen. Bds., 3, 1844, p. ...

Birds of Guatemala Birds of Mexico

Central American montane forests