Agelastes niger
Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Megaclassis: Osteichthyes
Cladus: Sarcopterygii
Cladus: Rhipidistia
Cladus: Tetrapodomorpha
Cladus: Eotetrapodiformes
Cladus: Elpistostegalia
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Cladus: Avemetatarsalia
Cladus: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauriformes
Cladus: Dracohors
Cladus: Dinosauria
Ordo: Saurischia
Cladus: Eusaurischia
Cladus: Theropoda
Cladus: Neotheropoda
Cladus: Averostra
Cladus: Tetanurae
Cladus: Avetheropoda
Cladus: Coelurosauria
Cladus: Tyrannoraptora
Cladus: Maniraptoromorpha
Cladus: Maniraptoriformes
Cladus: Maniraptora
Cladus: Pennaraptora
Cladus: Paraves
Cladus: Eumaniraptora
Cladus: Avialae
Infraclassis: Aves
Cladus: Euavialae
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Euornithes
Cladus: Ornithuromorpha
Cladus: Ornithurae
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Cladus: Pangalloanserae
Cladus: Galloanseres
Ordo: Galliformes
Familia: Numididae
Genus: Agelastes
Species: Agelastes niger
Name
Agelastes niger (Cassin, 1857)
References
Proc.Acad.Nat.Sci.Philadelphia 8["1856"] p.322
Vernacular names
English: Black Guineafowl
svenska: Svart pärlhöna
The black guineafowl (Agelastes niger) is a member of the guineafowl bird family. It occurs in humid forests in Central Africa. It is a medium-sized black bird with a bare, pink head and upper neck. Little is known of its behaviour.
Description
The head and upper neck of an adult black guineafowl are unfeathered, revealing the pink skin. A crest of short downy feathers is on the forehead and crown, and the throat and lower neck have a scattering of downy feathers. The body and tail feathers are black with some paler speckled markings on the belly. Males have one to three spurs on their legs, while females either have none or a single short spur. Juveniles are similar, but have buff tips to the feathers on their upper parts, a speckled breast, and white belly. The beak is greenish grey and the legs greyish brown. Males are usually slightly larger than females and measure about 42 cm (17 in) in length, weighing about 700 g (25 oz). The call is a monotonous high-pitched "kwee" repeated at the rate of two to three notes per second. The alarm call is an even shriller sound repeated more rapidly.[2]
Behaviour
The black guineafowl has been little studied. It is usually found in pairs or small groups, and is a shy, elusive bird of the forest floor. It occurs in primary and secondary growth woodland, favouring parts with thick undergrowth, but sometimes venturing out onto adjacent cultivated lands. It feeds on invertebrates such as ants, termites, millipedes, and beetles, and also small frogs, seeds, berries, and shoots. The nesting habits of this species are not known, but the eggs are pale reddish-brown, sometimes shaded with yellow or purple.[2] It may breed in the dry season or possibly at any time of year.[2]
Distribution and habitat
The black guineafowl is native to West Central Africa south of the Sahara. Its range includes Nigeria, Cameroon, Equatorial Guinea, Gabon, Angola, the Central African Republic, the Republic of the Congo, and the Democratic Republic of the Congo.[1] The extent of its range is estimated to be 764,000 km2 (295,000 sq mi).[3] It is found on the forest floor in primary and secondary tropical rainforest, especially with thick undergrowth, and in nearby cultivated croplands.[2]
Research
Black guineafowl are resistant to various diseases that affect poultry, including Ehrlichia ruminantium, which causes heartwater, but the mechanism for this resistance is not currently known to researchers. The black guineafowl's genome includes a toll-like receptor (TLR1) which plays an important role in the bird's immune system. This gene has been studied and includes 2,115 nucleotides, encoding 705 amino acids. TLR1 is associated with infections caused by bacteria in both humans and mice, and this gene is of interest to researchers because genetic variation in it is associated with increased Gram-positive bacterial infections, organ failure, and death.[4]
Status
The population trend for the black guineafowl seems to be downward, because it is hunted for food, possibly unsustainably, and may suffer from degradation of its habitat.[3] However, it is quite common within its range and the IUCN lists it as being of least concern in its Red List of Threatened Species, as the rate of decline does not seem to justify the bird being placed in a more vulnerable category.[1]
References
BirdLife International (2016). "Agelastes niger". IUCN Red List of Threatened Species. 2016: e.T22679551A92818640. doi:10.2305/IUCN.UK.2016-3.RLTS.T22679551A92818640.en. Retrieved 11 November 2021.
Madge, Steve; McGowan, J. K.; Kirwan, Guy M. (2002). Pheasants, Partridges and Grouse: A Guide to the Pheasants, Partridges, Quails, Grouse, Guineafowl, Buttonquails and Sandgrouse of the World. A. C. Black. p. 346. ISBN 9780713639667.
"Black Guineafowl Agelastes niger". BirdLife International. Retrieved 2013-10-01.
Wu, Yanhua; Ruan, Wenke; Cui, Defeng; Li, Huanrong (2012). "Identification of a Toll-Like Receptor 1 in Guinea Fowl (Agelastes niger)". Biochemical Genetics. 50 (9–10): 702–716. doi:10.1007/s10528-012-9513-5. PMID 22570094. S2CID 15885569.
Retrieved from "http://en.wikipedia.org/"
All text is available under the terms of the GNU Free Documentation License
