Blue Crane
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The blue crane (''Grus paradisea''), also known as the Stanley crane and the paradise crane, is the national bird of
South Africa South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countri ...
. The species is listed as Vulnerable by the
IUCN The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...
.


Description

The blue crane is a tall, ground-dwelling bird, but is fairly small by the standards of the crane family. It is tall, with a wingspan of and weighs . Among standard measurements, the wing chord measures , the exposed culmen measures and the tarsus measures . This crane is pale blue-gray in color becoming darker on the upper head, neck and nape. From the crown to the lores, the plumage is distinctly lighter, sometimes whitish. The
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 ...
is ochre to greyish, with a pink tinge. The long wingtip
feather Feathers are epidermal growths that form a distinctive outer covering, or plumage, on both avian (bird) and some non-avian dinosaurs and other archosaurs. They are the most complex integumentary structures found in vertebrates and a premier ...
s which trail to the ground. The primaries are black to slate grey, with dark coverts and blackish on the secondaries. Unlike most cranes, it has a relatively large head and a proportionately thin neck. Juveniles are similar but slightly lighter, with tawny coloration on the head, and no long wing plumes.


Habitat

Blue cranes are birds of the dry grassy uplands, usually the pastured grasses of hills, valleys, and plains with a few scattered trees. They prefer areas in the nesting season that have access to both upland and
wetland A wetland is a distinct ecosystem that is flooded or saturated by water, either permanently (for years or decades) or seasonally (for weeks or months). Flooding results in oxygen-free (anoxic) processes prevailing, especially in the soils. The ...
areas, though they feed almost entirely in dry areas. They are altitudinal migrants, generally nesting in the lower grasslands of an elevation of around 1,300 to 2,000 m and moving down to lower altitudes for winter.


Movements and behaviour

Of the 15 species of crane, the blue crane has the most restricted distribution of all. Even species with lower population numbers now (such as
Siberian Siberia ( ; rus, Сибирь, r=Sibir', p=sʲɪˈbʲirʲ, a=Ru-Сибирь.ogg) is an extensive region, geographical region, constituting all of North Asia, from the Ural Mountains in the west to the Pacific Ocean in the east. It has been a ...
or
whooping crane The whooping crane (''Grus americana'') is the tallest North American bird, named for its whooping sound. It is an endangered crane species. Along with the sandhill crane (''Antigone canadensis''), it is one of only two crane species native to ...
s) are found over a considerable range in their migratory movements. The blue crane is migratory, primarily altitudinal, but details are little known. The blue crane is partially social, less so during the breeding season. There is a strict hierarchy in groups, with the larger adult males being dominant. They overlap in range with three other crane species but interactions with these species and other "large wader" type birds are not known. They are relentlessly aggressive to various other animals during the nesting season, attacking non-predatory species such as cattle,
tortoise Tortoises () are reptiles of the family Testudinidae of the order Testudines (Latin: ''tortoise''). Like other turtles, tortoises have a turtle shell, shell to protect from predation and other threats. The shell in tortoises is generally hard, ...
s,
plover Plovers ( , ) are a widely distributed group of wading birds belonging to the subfamily Charadriinae. Description There are about 66 species in the subfamily, most of them called "plover" or "dotterel". The closely related lapwing subf ...
s and even sparrows. Humans are also attacked if they approach a nest too closely, with the aggressive male having torn clothes and drawn blood in such cases.


Feeding

Blue cranes feed from the ground and appear to rarely feed near wetland areas. Most of their diet is comprised by grasses and sedges, with many types fed on based on their proximity to the nests. They are also regularly insectivorous, feeding on numerous, sizeable insects such as grasshoppers. Small animals such as crabs,
snail A snail is, in loose terms, a shelled gastropod. The name is most often applied to land snails, terrestrial pulmonate gastropod molluscs. However, the common name ''snail'' is also used for most of the members of the molluscan class Gastro ...
s, frogs, small
lizard Lizards are a widespread group of squamate reptiles, with over 7,000 species, ranging across all continents except Antarctica, as well as most oceanic island chains. The group is paraphyletic since it excludes the snakes and Amphisbaenia alt ...
s and snakes may supplement the diet, with such protein-rich food often being broken down and fed to the young.


Breeding

The breeding period is highly seasonal, with eggs being recorded between October and March. Pair-formation amongst groups often starts in October, beginning with both potential parents running in circles with each other. The male then engages in a "dance" flings various objects in the air and then jumps. Eventually, a female from the group and the male appear to "select" each other and both engage in the dance of throwing objects and jumping. After the dance, mating commences in around two weeks. In a great majority of known nests, two eggs are laid (rarely one or three). Both males and females will incubate, with the male often incubating at night and, during the day, defending the nest territory while the female incubates. The incubation stage lasts around 30 days. The young are able to walk after two days and can swim well shortly thereafter. They are fed primarily by their mothers, who regurgitates food into the mouths. The chicks fledge in the age of 3–5 months. The young continue to be tended to until the next breeding season, at which time they are chased off by their parents.


Decline

While it remains common in parts of its historic range, and approx. 26 000 individuals remain, it began a sudden population decline from around 1980 and is now classified as vulnerable. In the last two decades, the blue crane has largely disappeared from the
Eastern Cape The Eastern Cape is one of the provinces of South Africa. Its capital is Bhisho, but its two largest cities are East London and Gqeberha. The second largest province in the country (at 168,966 km2) after Northern Cape, it was formed in ...
,
Lesotho Lesotho ( ), officially the Kingdom of Lesotho, is a country landlocked country, landlocked as an Enclave and exclave, enclave in South Africa. It is situated in the Maloti Mountains and contains the Thabana Ntlenyana, highest mountains in Sou ...
, and
Swaziland Eswatini ( ; ss, eSwatini ), officially the Kingdom of Eswatini and formerly named Swaziland ( ; officially renamed in 2018), is a landlocked country in Southern Africa. It is bordered by Mozambique to its northeast and South Africa to its no ...
. The population in the northern Free State,
Limpopo Limpopo is the northernmost province of South Africa. It is named after the Limpopo River, which forms the province's western and northern borders. The capital and largest city in the province is Polokwane, while the provincial legislature is ...
,
Gauteng Gauteng ( ) is one of the nine provinces of South Africa. The name in Sotho-Tswana languages means 'place of gold'. Situated on the Highveld, Gauteng is the smallest province by land area in South Africa. Although Gauteng accounts for only ...
, Mpumalanga and
North West Province North West is a province of South Africa. Its capital is Mahikeng. The province is located to the west of the major population centre of Gauteng and south of Botswana. History North West was incorporated after the end of Apartheid in 1994, an ...
has declined by up to 90%. The majority of the remaining population is in eastern and southern South Africa, with a small and separate population in the
Etosha Pan The Etosha Pan is a large endorheic salt pan, forming part of the Cuvelai-Etosha Basin in the north of Namibia. It is a hollow in the ground in which water may collect or in which a deposit of salt remains after water has evaporated. The 120-kilo ...
of northern
Namibia Namibia (, ), officially the Republic of Namibia, is a country in Southern Africa. Its western border is the Atlantic Ocean. It shares land borders with Zambia and Angola to the north, Botswana to the east and South Africa to the south and ea ...
. Occasionally, isolated breeding pairs are found in five neighbouring countries. The primary causes of the sudden decline of the blue crane are human population growth, the conversion of grasslands into commercial tree plantations, and poisoning: deliberate (to protect crops) or accidental (baits intended for other species, and as a side-effect of
crop dusting Aerial application, or what is informally referred to as crop dusting, involves spraying crops with crop protection products from an agricultural aircraft. Planting certain types of seed are also included in aerial application. The specific sp ...
). The South African government has stepped up legal protection for the blue crane. Other conservation measures are focusing on research, habitat management, education, and recruiting the help of private landowners. The blue crane is one of the species to which the ''Agreement on the Conservation of African-Eurasian Migratory Waterbirds'' (
AEWA The Agreement on the Conservation of African-Eurasian Migratory Waterbirds, or African-Eurasian Waterbird Agreement (AEWA) is an independent international treaty developed under the auspices of the United Nations Environment Programme's Conventio ...
) applies. Since October 2021, the Blue Crane has been classified as Moderately Depleted by the
IUCN The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...
.


Cultural references

The blue crane is culturally significant to the
Xhosa people The Xhosa people, or Xhosa-speaking people (; ) are African people who are direct kinsmen of Tswana people, Sotho people and Twa people, yet are narrowly sub grouped by European as Nguni ethnic group whose traditional homeland is primarily t ...
, who call it ''indwe'' (flag). Traditionally, when a man distinguished himself in battle or otherwise, he was often decorated by a chief with blue crane feathers in a ceremony called ''ukundzabela''. Men so honoured, who would wear the feathers sticking out of their hair, were known as men of (trouble)—the implication being that if trouble arose, they would reinstate peace and order. It is also of significance to the
Zulu people Zulu people (; zu, amaZulu) are a Nguni ethnic group native to Southern Africa. The Zulu people are the largest ethnic group and nation in South Africa, with an estimated 10–12 million people, living mainly in the province of KwaZulu-Nata ...
, whose kings and warriors wore a single or many feathers as a headdress.Natlia
/ref> Because of the association with warriors and heroism, the
Isitwalandwe Medal Isitwalandwe/Seaparankoe, until 1994 known as the Isitwalandwe Medal, also known as the Isitwalandwe Award and also spelt Isithwalandwe and Isitwalandwe/Seaparankwe, is the highest award given by the African National Congress (ANC) "to those who ...
was created to honour those who had "made an outstanding contribution and sacrifice to the liberation struggle", that is, those who resisted the apartheid regime in
South Africa South Africa, officially the Republic of South Africa (RSA), is the southernmost country in Africa. It is bounded to the south by of coastline that stretch along the South Atlantic and Indian Oceans; to the north by the neighbouring countri ...
(1949–1991) in various ways. Isitwalandwe means "the one who wears the plumes of the rare bird", or blue crane. The blue crane is also the
national bird This is a list of national birds, including official birds of overseas territories and other states described as nations. Most species in the list are officially designated. Some species hold only an "unofficial" status. National birds See al ...
of South Africa.


Videos

File:Anthropoides paradisea1.ogg File:Anthropoides paradisea2.ogg File:Anthropoides paradisea3.ogg


References


External links

*
Species text for Blue Crane in The Atlas of Southern African BirdsInternational Crane Foundation's Blue Crane pageBlue Crane (''Anthropoides paradises'')
from ''Cranes of the World'' by
Paul Johnsgard Paul Austin Johnsgard (28 June 1931 – 28 May 2021) was an ornithologist, artist and emeritus professor at the University of Nebraska. His works include nearly fifty books including several monographs, principally about the waterfowl and cranes. ...

Are traditional healers contributing to the decline of Blue Cranes in Namibia?
{{Taxonbar, from=Q756674 Articles containing video clips Grus (genus) Birds of Southern Africa National symbols of South Africa Birds described in 1793 Taxa named by Anton August Heinrich Lichtenstein Taxobox binomials not recognized by IUCN