Balearica pavonina (*)
Superregnum: Eukaryota
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Superphylum: Deuterostomia
Phylum: Chordata
Cladus: Craniata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Cladus: Reptiliomorpha
Cladus: Amniota
Classis: Reptilia
Cladus: Eureptilia
Cladus: Romeriida
Subclassis: Diapsida
Cladus: Sauria
Infraclassis: Archosauromorpha
Cladus: Crurotarsi
Divisio: Archosauria
Subsectio: Ornithodira
Subtaxon: Dinosauromorpha
Cladus: Dinosauria
Ordo: Saurischia
Cladus: Theropoda
Cladus: Neotheropoda
Infraclassis: Aves
Cladus: Euavialae
Cladus: Avebrevicauda
Cladus: Pygostylia
Cladus: Ornithothoraces
Cladus: Euornithes
Cladus: Ornithuromorpha
Cladus: Ornithurae
Cladus: Carinatae
Parvclassis: Neornithes
Cohors: Neognathae
Ordo: Gruiformes
Familia: Gruidae
Subfamilia: Balearicinae
Genus: Balearica
Species: Balearica pavonina
Subspecies: B. p. ceciliae – B. p. pavonina
Name
Balearica pavonina (Linnaeus, 1758)
Synonyms
Ardea pavonina (protonym)
References
Linnaeus, C. 1758. Systema Naturae per regna tria naturæ, secundum classes, ordines, genera, species, cum characteribus, differentiis, synonymis, locis, Tomus I. Editio decima, reformata. Holmiæ: impensis direct. Laurentii Salvii. i–ii, 1–824 pp DOI: 10.5962/bhl.title.542: 141. Reference page.
IUCN: Balearica pavonina (Vulnerable)
Vernacular names
العربية: كركي متوج
brezhoneg: Garan zu
català: Grua coronada de coll negre
čeština: Jeřáb paví
Deutsch: Kronenkranich
English: Black Crowned Crane
español: Grulla coronada cuellinegra
euskara: Kurrilo koroatu
suomi: Kruunukurki
français: Grue couronnée
Hausa: Gauraka
עברית: עגור כתר שחור
magyar: Feketenyakú koronásdaru
italiano: Gru coronata nera
日本語: カンムリヅル
ქართული: გვირგვინოსანი წერო
қазақша: Тәжді тырна
lietuvių: Karūnuotoji gervė
монгол: Хар залаат тогоруу
Plattdüütsch: Swart Kronenkraan
Nederlands: Zwarte kroonkraan
polski: Koronnik czarny
português: Grou-coroado
русский: Венценосный журавль
slovenščina: Pavji žerjav
svenska: Svart krontrana
ไทย: นกกระเรียนมงกุฎดำ
Türkçe: Taçlı turna
Tiếng Việt: Sếu hoàng gia đen
中文: 黑冕鶴
The black crowned crane (Balearica pavonina) is a part of the family Gruidae, along with its sister species, the grey crowned crane. It is topped with its characteristic bristle-feathered golden crown. It is usually found in the shallow wetlands of sub-Saharan Africa during the wet season, which act as its principal breeding, feeding and roosting sites although it can also be found foraging in grasslands and near croplands of dry savanna.
Contents
1 Taxonomy
2 Description
3 Habitat and distribution
4 Behavior
4.1 Vocalization
4.2 Diet
4.3 Breeding
5 Conservation status and threats
6 In culture
7 Gallery
8 References
9 External links
Taxonomy
The black crowned crane is of the order Gruiformes, which includes all cranes as well as the rails (family Rallidae). Cranes are further classified in the Gruidae family which includes sister species like the grey crowned crane as well as the sandhill crane and the whooping crane. The black crowned crane has two subspecies: Balearica pavonina pavonina and Balearica pavonina ceciliae.[2]
Description
Side profile of Balearica pavonina ceciliae
The black crowned crane can measure up to 105 cm in length, weigh between 3000-4000 g and has a wingspan of 180–200 cm.[3] Naturally, it is characterized by its dark slate-grey to black plumage, and it has stiff golden feathers at the top of its head which make up its crown. Each golden bristle-like feather is a spiral that is white on one side and brown on the other with black at the very tip.[4] Other distinct features of these birds include the white feathers on the upper section of their wings and the small pouch of red skin, the gular sac, hanging underneath their chins. Their long legs and their toes are black, and they possess a long hind toe that allows them to grasp onto perches. The black crowned crane also has large red cheek patches just behind its eye that differ in size between its two subspecies; the West African black crowned crane (Balearica pavonina pavonina) has red on the lower half of its cheek patch while the Sudan black crowned crane (Balearica pavonine ceciliae) has red extending to the upper half as well.[4] Male black crowned cranes are larger but are otherwise indistinguishable from females. Juveniles are mostly grey with a brown crown and a nape, grey to brown body.[3]
Habitat and distribution
The black crowned crane is found across the Sahel and Sudan Savanna regions of Africa, occupying open areas such as grasslands, shallow wetlands, marshes, as well as the margins of lakes and rivers.[5][6] It is also known to roost in trees. Its range extends from the Senegal Basin and Guinea-Bissau Drainage in West Africa to the Ethiopian Highlands and South-West Rift Valley in East Africa. Balearica pavonina pavonina occupies the western part of this range, while Balearica pavonina ceciliae is found in the east with the greatest numbers in Sudan[7].
Behavior
Vocalization
Black crowned crane vocalization is characterized as generally low-pitched and mellow “honk” and “ka-wonk ka-wonk ka-wonk” expressions.[3][4]
Diet
Black crowned cranes are generalist feeders, with a diet consisting of insects like grasshoppers, locust, and flies; other invertebrates, like molluscs, millipedes, and crustaceans; fish, amphibians, and small reptiles.[3] They will be mostly resident to wetlands except during the dry season and will sometimes forage in short and dry grasses or in upland areas by livestock where insect numbers are high.[7] Black crowned cranes may also forage in croplands and feed on rice, corn, teff, millet, chickpea, and lentil.[8] They will seldom dig for food but rather will peck at it off surfaces. As an alternative to digging, they might stomp their feet to disturb and reveal invertebrates in the soil.[3]
Breeding
Breeding may occur from May to December for the West African black crowned crane and from July to January for the Sudan black crowned crane.[7] The margins for breeding time are wide as breeding success is dependent on the wet and dry seasons and the suitability of the environment.[8][7] Black crowned crane numbers will peak in the dry season where flocks may include several hundred individuals.[7] They gather in this way before the next breeding season commences, which allows for juvenile cranes to merge with other young flocks that have not yet reached the first breeding age of 3–5 years.[7] In the breeding season, Black crowned cranes are usually found in pairs but are also observed in groups of up to 20 individuals.[7]
Nests (base of 69–109 mm x 71–140 mm diameters) are built within or on the edges of dense wetlands and are constructed with grasses and sedges modified into circular platforms.[3] Due to their opportunistic nature regarding food availability and shelter, Black crowned cranes may alter their nesting sites accordingly with the season.[7] Clutch sizes for the black crowned crane are made up of 1 to 3 eggs,[8] which will be 122—168 g in mass.[3] Incubation of eggs will be performed by both males and females and will last 28–31 days.[3] Males are known to stand guard by the nest in nearby trees, prepared to signal a threat, as females forage.[7] Chicks will forage with their parents in grassland areas the day after hatching. Fledging takes place between 60–100 days.[3]
Conservation status and threats
Currently, the black crowned crane is listed as a Vulnerable species on the IUCN Red List, with a population of 28 000—47 000 individuals remaining.[9] Black crowned cranes face major conservation threats due to the degradation of wetlands which act as the principal breeding, feeding and roosting sites for the species.[8][5] Increases in drought and the draining of wetlands in the name of farming, dam construction or irrigation projects have led to the destruction of these ecosystems. Furthermore, fragmented wetlands result in reduced movement of aquatic mammals and therefore limits Black crowned crane food availability. The negative effects of habitat degradation on black crowned crane populations are further aggravated by the hunting, capturing or trade of these birds which have claimed much of their remaining wild populations.
In culture
The black crowned crane is the national bird of Nigeria, and is often regarded as a symbol of peace.
References
BirdLife International (2016). "Balearica pavonina". IUCN Red List of Threatened Species. 2016: e.T22692039A93334339. doi:10.2305/IUCN.UK.2016-3.RLTS.T22692039A93334339.en. Retrieved 18 November 2021.
"Balearica pavonina". The Integrated Taxonomic Information System.
Archibald, G.W., Meine, C.D., Kirwan, G.M., & Garcia, E.F.J. (2020). Del Hoyo, Josep; Elliott, Andrew; Sargatal, Jordi; Christie, David; De Juana, Eduardo (eds.). "Black Crowned-Crane (Balearica pavonina)". Birds of the World. doi:10.2173/bow.blccra1.01 – via The Cornell Lab of Ornithology.
Walkinshaw, L.H. (1964). "The African Crowned Cranes". Wilson Ornithological Society. 76 (4): 355–377. JSTOR 4159328 – via JSTOR.
Aticho, A., Gemeda, D.O., Feyssa, D.H., Jiru, D.B., & Beyene, A. (2018). "Assessment of black crowned crane and wattled crane population and spatiotemporal distribution in Jimma Zone, Southwest Ethiopia". Global Ecology and Conservation. 16: e00459. doi:10.1016/j.gecco.2018.e00459 – via ELSEVIER.
Tréca, B. (1993). "Wetland habitats for black crowned cranes in West and Central Africa" (PDF). Proceedings 1993 African Crane and Wetland Training Workshop.
Meles, S.K., & Gemeda, D.O. (2019). "Effects of habitat loss and human influence on the survival of black-crowned cranes in Africa". Journal of Degraded and Mining Lands Management. 6 (3): 1705–1711. doi:10.15243/jdmlm.2019.063.1705.
Aynalem, S., Nowald, G., & Schröder, W. "Biology and Ecology of Cranes: Wattled Cranes (Grus carunculatus), Blackcrowned Cranes (Balearica pavonina), and Eurasian Cranes (Grus grus) at Lake Tana, Ethiopia". Proceedings of the VIIth Crane Conference.
BirdLife International (2020). "Balearica pavonina". IUCN Red List of Threatened Species. 2020.
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