Bronze-winged courser

Last updated

Bronze-winged courser
Bronze-winged Courser (Rhinoptilus chalcopterus) (13950665425).jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Charadriiformes
Family: Glareolidae
Genus: Rhinoptilus
Species:
R. chalcopterus
Binomial name
Rhinoptilus chalcopterus
(Temminck, 1824)

The bronze-winged courser or violet-tipped courser (Rhinoptilus chalcopterus) is a species of bird in the family Glareolidae. This species is named for its characteristic bronze-tipped feathers that are visible during flight. It is found living throughout Sub-Saharan Africa, inhabiting semi-arid savannas and woodlands. [2] This is a nocturnal species which mainly feeds on ground-dwelling insects. Bronze-winged coursers are typically solitary, only forming monogamous pairs for breeding. A female may produce 2-3 eggs per clutch, [2] and the chicks receive parental care from both sexes when young. [3] The bronze-winged courser is considered of Least Concern for conservation status, and is thought to be a very stable species. [4]

Contents

Description

The bronze-winged courser is a species of small wading birds with long legs and short wings. The bronze-winged courser is the largest of the coursers, with a body length of 25-29 centimeters, a wingspan up to 58 centimeters, and body weight between 91 and 220 grams. [3]

Adult Recognition

The bronze-winged courser can be recognized by its characteristic head markings and overall coloration. The adult plumage differs from the juvenile plumage in this species. Mature adults have a dull grey-brown upper breast and back. The upper tail is white, while the remainder of the tail is dark brown and bordered with white. The breast features a thin black band that separates the brownish-grey upper chest from the buffy lower breast and belly. The head has distinct cream-white supercilium, forecrown, and posterior eyeline, as well as buffy upper neck and throat. The facial lores and ear-coverts are darker brown-black. The underwing coverts are white, contrasting with the dark black primaries which are tipped with iridescent copper to violet coloration. These copper wingtips are visible exclusively during flight–denoting the bird's common name the "bronze-winged courser". The bill is long and curved slightly downward, and appears black with a reddish-purple base. The eyes are large on the head, featuring a bright reddish-purple eye ring. The long legs are red in color. [3] [2]

The adult bronze-winged courser in flight may be visually confused with another group that is similar in appearance–the lapwings. Both have comparable underpart coloration and body size. [3]

Juvenile Recognition

The juvenile bronze-winged courser sports a less vibrant plumage pattern in contrast to the adults. The upper feathers of the body are cream-yellow at the ends, and the breast features an even thinner dark band. Chicks of this species are speckled in appearance, looking almost like sandy burnt vegetation. [3]

Taxonomy

The bronze-winged courser (Rhinoptilus chalcopterus) is a species of courser within the family Glareolidae. The coursers are a part of the order Charadriiformes in the class Aves. This species has no classified subspecies.

Range

The bronze-winged courser is found in parts of Sub-Saharan Africa, and can be found residing in different areas of the continent according to season. It is thought that the bronze-winged courser spends its breeding season in the southern parts of its range, and migrates north after breeding. [3] [2] The breeding season spans from July to December. [5]

Historical records show the bronze-winged courser present in many localities at various times through the year, including but not limited to: Eritrea, Nigeria, Ghana, Sudan, Kenya, Democratic Republic of the Congo, Malawi, Botswana, Zambia, Zimbabwe, Gambia, and more recently Ethiopia. [6] [3] [2]

Habitat and Disruption

The bronze-winged courser inhabits semi-arid environments such as dry savanna woodlands with areas of dense brush. This species can rarely be found in open areas including grasslands located nearby wooded savannas. They tend to inhabit lower elevations, though can be found within areas of elevation up to 2,350 meters. Breeding is thought to occur within a lower elevation range, likely not surpassing elevations of more than 1700 meters. [3]

The bronze-winged courser is susceptible to disturbance by human activities, particularly related to land alteration of its habitat due to farming or agricultural practices. [3] Clearing woodlands and similar environment reduced the habitat available for bronze-winged courser. This species is also predated on by other birds in its environment, including the Bateleur and the Tawny Eagle. [5]

Behavior

Vocalizations

The bronze-winged courser can be heard by its calls at night, but is otherwise a quiet species. [3]

Diet

The bronze-winged courser is thought to be a strict insectivore–presumably feeding on ground dwelling insects such as grasshoppers. [3] The bronze-winged courser is a nocturnal feeder, foraging in a plover-like manner–pecking at the ground to capture prey while walking or running around. [3]

Reproduction

The bronze-winged courser is a solitary species which forms monogamous pairs for breeding. Though forming pairs, the couples are territorial, and keep their adjacent nests at least 100 meters from one another. [3] Breeding occurs during the dry season. Bronze-winged coursers typically select nesting areas that have been impacted by recent burns or fires. They usually do not construct a true nest, but rather clear a small "nest" like spot, often no more than a 1 centimeter deep indentation in the ground. [3] [2] The bronze-winged courser nests in open sites with good visibility. Within the nest, the bronze-winged courser lays a clutch of up to 3 eggs, [2] which are camouflaged to blend into their environments. [7] [8] This camouflaging of the eggs allows higher survival rates with such an open nesting environment. [8] Egg camouflaging can vary in color, and closely mimics the environment in which they are laid. [7] [8] Eggs can appear cream to yellow, with hints of grey, sepia, reddish-brown, darker black, and even purple tones. Eggs are small in size, measuring anywhere from 33-40mm x 25-28mm. [3] The eggs are incubated by both parents for 25–27 days, during which the parents alternate between sitting on the nest while the other stands watch close by. [3] If approached by a predator, the parents will flee the nest and leave the eggs in the open. It has been found that bronze-winged coursers will move at least 5 meters away from the nest if threatened. [9]

Once hatched, the chicks receive parental care from both sexes. It is unknown how long the chicks fledging period lasts. The plumage on chicks of the bronze-winged courser is white from below, and appears speckled with red-brown and black from above. The legs are dark grey and the bill is black. [3]

Status and Conservation

The bronze-winged courser is considered of Least Concern (LC) in nature protection. This species is not globally threatened, and is highly protected by the establishment of nature and game reserves within their range. [3]

It is difficult to record true population numbers of bronze-winged coursers. This species is often underestimated and size is challenging to predict. [3]

Causes of mortality in the bronze-winged courser are often linked to traffic deaths. This nocturnal species can be found running on roads at night, where it may occasionally face fatalities from motor vehicle encounters. [3] Other mortalities are normally due to predation by local wildlife. [9]

Related Research Articles

<span class="mw-page-title-main">Courser</span> Subfamily of birds

The coursers are a subfamily (Cursoriinae) of birds which together with the pratincoles make up the family Glareolidae. They have long legs, short wings and long pointed bills which curve downwards. Their most unusual feature for birds classed as waders is that they inhabit deserts and similar arid regions.

<span class="mw-page-title-main">Common tern</span> Migratory seabird in the family Laridae with circumpolar distribution

The common tern is a seabird in the family Laridae. This bird has a circumpolar distribution, its four subspecies breeding in temperate and subarctic regions of Europe, Asia and North America. It is strongly migratory, wintering in coastal tropical and subtropical regions. Breeding adults have light grey upperparts, white to very light grey underparts, a black cap, orange-red legs, and a narrow pointed bill. Depending on the subspecies, the bill may be mostly red with a black tip or all black. There are several similar species, including the partly sympatric Arctic tern, which can be separated on plumage details, leg and bill colour, or vocalisations.

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

Glareolidae is a family of birds in the wader suborder Lari. It contains two distinct groups, the pratincoles and the coursers. The atypical Egyptian plover, traditionally placed in this family, is now known to be only distantly related.

<span class="mw-page-title-main">Black-legged kittiwake</span> Species of bird

The black-legged kittiwake is a seabird species in the gull family Laridae.

<span class="mw-page-title-main">Bronze mannikin</span> Species of bird

The bronze mannikin or bronze munia is a small passerine bird of the Afrotropics. This very social estrildid finch is an uncommon to locally abundant bird in much of Africa south of the Sahara Desert, where it is resident, nomadic or irruptive in mesic savanna or forest margin habitats. It has an estimated global extent of occurrence of 8,100,000 km2. It is the smallest and most widespread of four munia species on the African mainland, the other being black-and-white, red-backed and magpie mannikin. It co-occurs with the Madagascar mannikin on the Comoro Islands, and was introduced to Puerto Rico. Especially in the West Africa, it is considered a pest in grain and rice fields. It is locally trapped for the pet bird trade.

<i>Rhinoptilus</i> Genus of birds

Rhinoptilus is a genus of coursers, a group of wading birds. There are three species, which breed in Africa and South Asia. They have long legs, short wings and long pointed bills which curve downwards. Although classed as waders, they inhabit deserts and similar arid regions. Like the pratincoles, the coursers are found in warmer parts of the Old World. They hunt insects by sight, pursuing them on foot.

<span class="mw-page-title-main">Kori bustard</span> Species of bustard native to Africa

The kori bustard is the largest flying bird native to Africa. It is a member of the bustard family, which all belong to the order Otidiformes and are restricted in distribution to the Old World. It is one of the four species in the large-bodied genus Ardeotis. In fact, the male kori bustard may be the heaviest living animal capable of flight.

<span class="mw-page-title-main">Black-chested snake eagle</span> Species of bird

The black-chested snake eagle or black-breasted snake eagle is a large African bird of prey of the family Accipitridae. It resembles other snake eagles and was formerly considered conspecific with the short-toed and Beaudouin's snake eagles, to which it is closely related.

<span class="mw-page-title-main">White-fronted plover</span> Species of shorebird of the family Charadriidae from Sub-Saharan Africa and Madagascar

The white-fronted plover or white-fronted sandplover is a small shorebird of the family Charadriidae that inhabits sandy beaches, dunes, mudflats and the shores of rivers and lakes in sub-saharan Africa and Madagascar. It nests in small shallow scrapes in the ground and lays clutches of one to three eggs. The species is monogamous and long-lived, with a life expectancy of approximately 12 years. The vast majority of pairs that mate together stay together during the following years of breeding and retain the same territory. The white-fronted plover has a similar appearance to the Kentish plover, with a white fore crown and dark bands connecting the eyes to the bill.

<span class="mw-page-title-main">Kentish plover</span> Species of bird

The Kentish plover is a small wader of the family Charadriidae that breeds on the shores of saline lakes, lagoons, and coasts, populating sand dunes, marshes, semi-arid desert, and tundra. Both male and female birds have pale plumages with a white underside, grey/brown back, dark legs and a dark bill; however, additionally the male birds also exhibit very dark incomplete breast bands, and dark markings either side of their head, therefore the Kentish plover is regarded as sexually dimorphic.

<span class="mw-page-title-main">Brown treecreeper</span> Species of bird

The brown treecreeper is the largest Australasian treecreeper. The bird, endemic to eastern Australia, has a broad distribution, occupying areas from Cape York, Queensland, throughout New South Wales and Victoria to Port Augusta and the Flinders Ranges, South Australia. Prevalent nowadays between 16˚S and 38˚S, the population has contracted from the edges of its pre-European range, declining in Adelaide and Cape York. Found in a diverse range of habitats varying from coastal forests to mallee shrub-lands, the brown treecreeper often occupies eucalypt-dominated woodland habitats up to 1,000 metres (3,300 ft), avoiding areas with a dense shrubby understorey.

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

The plain-tailed nighthawk is a species of nightjar in the family Caprimulgidae. It is endemic to Brazil. Its natural habitat is dry savanna. It is threatened by habitat loss. The Plain-tailed was given its name due to the lack of bands on its tail. Other names it was given include "Bahia Nighthawk" and "Caatinga Nighthawk" although not completely inappropriate due to the fact that they are not only found specifically in those areas.

<span class="mw-page-title-main">Madagascar plover</span> Species of bird

The Madagascar plover, also known as the black-banded plover, is a small monogamous shorebird in the family Charadriidae, native to western Madagascar. It inhabits shores of lagoons, coastal grasslands, and breeds in salt marshes. These plovers mainly nest in open grassland and dry mudflats surrounding alkaline lakes. The species is classified as vulnerable by the IUCN because of its low breeding success, slow reproductive rate, and weak adaptation to increasing habitat loss, leading to declining population numbers.

<span class="mw-page-title-main">Whistling cisticola</span> Species of bird

The whistling cisticola is a species of bird in the Cisticolidae family. It can be found in several regions within Africa, such as Angola, Benin, Burundi, Cameroon, Central African Republic, Republic of the Congo, Ivory Coast, Gabon, Gambia, Ghana, Guinea, Kenya, Liberia, Mali, Nigeria, Senegal, Sierra Leone, Sudan, Togo, Uganda, and Zambia. Its natural habitats include subtropical or tropical dry forests, dry savanna, and moist savanna.

<span class="mw-page-title-main">Rock pratincole</span> Species of bird

The rock pratincole is a species of bird in the family Glareolidae.

<span class="mw-page-title-main">Pied stilt</span> Species of bird

The pied stilt, also known as the white-headed stilt, is a shorebird in the family Recurvirostridae. It is widely distributed with a large total population size and apparently stable population trend, occurring in Malaysia, Japan, the Philippines, Brunei, Christmas Island, Indonesia, Palau, Papua New Guinea, Australia, and New Zealand. It is listed as Least Concern on the IUCN Red List. It is sometimes considered a subspecies of the black-winged stilt.

<span class="mw-page-title-main">Double-banded courser</span> Species of bird

The double-banded courser, also known as the two-banded courser, is a species of bird in the family Glareolidae.

<span class="mw-page-title-main">Australian pratincole</span> Species of bird

The Australian pratincole is a species of bird in the family Glareolidae. It breeds in Australia's interior; it winters to northern and eastern parts of the continent, Indonesia and New Guinea. It is a medium-sized nomadic shorebird which is commonly found in arid inland Australia. It breeds predominantly from south-western Queensland to northern Victoria and through central Australia to the Kimberley region in Western Australia. The Australian population is estimated at 60,000 individuals. They are a migratory species that generally move to the southern parts of their distribution range to breed during spring and summer. During winter they migrate to northern Australia, New Guinea, Java, Sulawesi and southern Borneo to over-winter. Although they are common, their occurrence is unpredictable and varies in location.

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

The white-winged widowbird is a species of passerine bird in the family Ploceidae native to Africa south of the Sahara. It is highly sexually dimorphic in its breeding season, during which the male's yellow plumage turns dark and he gains more white feathers, contrasting with the female's predominantly pale coloration. Three subspecies are recognised.

<span class="mw-page-title-main">Yellow-crowned bishop</span> Species of bird

The yellow-crowned bishop is a species of passerine bird in the family Ploceidae native to Africa south of the Sahara. It is highly sexually dimorphic in its breeding season, during which the male adopts a distinctive yellow and black plumage, contrasting with the female's predominantly brown coloration. Four subspecies are recognised.

References

  1. BirdLife International (2016). "Rhinoptilus chalcopterus". IUCN Red List of Threatened Species . 2016: e.T22694095A93438523. doi: 10.2305/IUCN.UK.2016-3.RLTS.T22694095A93438523.en . Retrieved 12 November 2021.
  2. 1 2 3 4 5 6 7 Stark, Arthur Cowell (1906). The Birds of South Africa. R. H. Porter.
  3. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Maclean, Gordon L.; Kirwan, Guy M. (2020-03-04). Del Hoyo, Josep; Elliott, Andrew; Sargatal, Jordi; Christie, David; De Juana, Eduardo (eds.). "Bronze-winged Courser (Rhinoptilus chalcopterus)". Birds of the World. doi:10.2173/bow.brwcou1.01. S2CID   216479729.
  4. International), BirdLife International (BirdLife (2016-10-01). "IUCN Red List of Threatened Species: Rhinoptilus chalcopterus". IUCN Red List of Threatened Species.
  5. 1 2 "Rhinoptilus chalcopterus (Bronze-winged courser)". www.biodiversityexplorer.info. Retrieved 2021-11-06.
  6. Rannestad, Ole Tobias (2016-02-01). "Additions to the Ethiopian bird atlas: 126 new records from 14 atlas squares". Scopus: Journal of East African Ornithology. 36 (1): 1–14. ISSN   2313-1799.
  7. 1 2 Stevens, Martin; Ruxton, Graeme D. (2019). "The key role of behaviour in animal camouflage". Biological Reviews. 94 (1): 116–134. doi:10.1111/brv.12438. ISSN   1469-185X. PMC   6378595 . PMID   29927061.
  8. 1 2 3 Troscianko, Jolyon; Wilson-Aggarwal, Jared; Stevens, Martin; Spottiswoode, Claire N. (2016-01-29). "Camouflage predicts survival in ground-nesting birds". Scientific Reports. 6 (1): 19966. Bibcode:2016NatSR...619966T. doi:10.1038/srep19966. ISSN   2045-2322. PMC   4731810 . PMID   26822039.
  9. 1 2 Wilson-Aggarwal, Jared K.; Troscianko, Jolyon T.; Stevens, Martin; Spottiswoode, Claire N. (August 2016). "Escape Distance in Ground-Nesting Birds Differs with Individual Level of Camouflage". The American Naturalist. 188 (2): 231–239. doi:10.1086/687254. hdl: 10871/20871 . ISSN   0003-0147. PMID   27420787. S2CID   3855769.