Black guineafowl

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Black guineafowl
Agelastes niger.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Galliformes
Family: Numididae
Genus: Agelastes
Species:
A. niger
Binomial name
Agelastes niger
(Cassin, 1857)

The black guineafowl (Agelastes niger) is a terrestrial bird of the Numididae (guineafowl) family found in humid forests in West-Central Africa. It is a medium-sized, black galliforme bird with a bare, orange-pink head and upper neck. As it inhabits dense, potentially inaccessible, regions of equatorial African jungle, little is known of black guineafowl behaviour or habits. By all accounts, it is a more reclusive, secretive bird when compared to the other, more sociable guineafowl species; i.e., researchers have been able to successfully observe and document far more information on the confident, gregarious and open grassland-dwelling helmeted guineafowl (Numidia meleagris), or even the more exotic vulturine guineafowl (Acryllium vulturinum). Compared to the black guineafowl, the aforementioned species (and most guineafowl) tend to be found in more exposed, dry savanna and arid open forest habitat, and congregate in larger communal flocks. Black guineafowl are seemingly very wary birds, living in smaller social groups than other guineafowl, and are constantly looking for signs of danger—the slightest hint of which will send the group darting into the bush to hide.

Contents

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 the western portions of Central Africa (south of the Sahara), from Nigeria and Cameroon in the west, east and southeast through Equatorial Guinea, Gabon, Angola, Central African Republic, Republic of the Congo, and the Democratic Republic of the Congo. [1] The geographical limit of the species' range is estimated to be around 764,000 km2 (295,000 sq mi). [3] The birds are terrestrial, however they can fly short distances. They spend much of their time looking for food on the forest floor, living in primary (old-growth) and secondary tropical rainforest as well as occasionally foraging in cultivated croplands or pastures. [2] Regardless of location, black guineafowl feel most reassured being in or near-to thick jungle vegetation in order to flee from threats or predators.

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]

Related Research Articles

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<span class="mw-page-title-main">Guineafowl</span> Family of birds

Guineafowl are birds of the family Numididae in the order Galliformes. They are endemic to Africa and rank among the oldest of the gallinaceous birds. Phylogenetically, they branched off from the core Galliformes after the Cracidae and before the Odontophoridae. An Eocene fossil lineage Telecrex has been associated with guineafowl; Telecrex inhabited Mongolia, and may have given rise to the oldest of the true phasianids, such as blood pheasants and eared pheasants, which evolved into high-altitude, montane-adapted species with the rise of the Tibetan Plateau. While modern guineafowl species are endemic to Africa, the helmeted guineafowl has been introduced as a domesticated bird widely elsewhere.

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<span class="mw-page-title-main">Vulturine guineafowl</span> Species of bird

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<span class="mw-page-title-main">Pin-tailed sandgrouse</span> Species of bird

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<span class="mw-page-title-main">Caucasian grouse</span> Species of bird

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<span class="mw-page-title-main">Salvadori's pheasant</span> Species of bird

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<span class="mw-page-title-main">Great argus</span> Species of pheasant

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<span class="mw-page-title-main">Crested argus</span> Species of bird

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<span class="mw-page-title-main">White-breasted guineafowl</span> Species of bird

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<span class="mw-page-title-main">Starred wood quail</span> Species of bird

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<span class="mw-page-title-main">Altai snowcock</span> Species of bird

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<span class="mw-page-title-main">Spotted sandgrouse</span> Species of bird

The spotted sandgrouse is a species of ground dwelling bird in the family Pteroclidae. It is found in arid regions of northern and eastern Africa and across the Middle East and parts of Asia as far east as northwest India. It is a gregarious, diurnal bird and small flocks forage for seed and other vegetable matter on the ground, flying once a day to a waterhole for water. In the breeding season pairs nest apart from one another, the eggs being laid in a depression on the stony ground. The chicks leave the nest soon after hatching and eat dry seed, the water they need being provided by the male which saturates its belly feathers with water at the waterhole. The spotted sandgrouse is listed as being of "least concern" by the International Union for Conservation of Nature in its Red List of Threatened Species.

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<span class="mw-page-title-main">Malayan crested argus</span> Species of bird

The Malayan crested argus is a large and spectacular peafowl-like species of bird in the pheasant family with dark-brown-spotted black and buff plumage, a heavy pink bill, brown irises and blue skin around the eyes. The head has two crests; the hind crest, which extends down the occiput, is erected when alarmed and during intentional behaviors including pair bonding and courtship displays. The male has a broad and greatly elongated tail of twelve feathers. The tail covert of the male is the longest of any bird and is believed to contain the longest feathers to occur in a wild bird; the Reeves's pheasant has tail feathers of similar length but which are considerably narrower. The tail coverts measure up to 1.73 m (5.7 ft) in length, giving the bird a total length of 1.9–2.39 m (6.2–7.8 ft).

References

  1. 1 2 3 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.
  2. 1 2 3 4 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.
  3. 1 2 "Black Guineafowl Agelastes niger". BirdLife International. Retrieved 2013-10-01.
  4. 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.