Black-capped social weaver

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Black-capped social weaver
Pseudonigrita cabanisi 1.jpg
Scientific classification Red Pencil Icon.png
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Ploceidae
Genus: Pseudonigrita
Species:
P. cabanisi
Binomial name
Pseudonigrita cabanisi
(Fischer & Reichenow, 1884)
Synonyms
  • Nigrita cabanisi
  • Somalita cabanisi

The black-capped social weaver (Pseudonigrita cabanisi) is a sparrow-like species of bird that has been assigned to the weaverbird family. It was originally described by Fisher and Reichenow, and later re-classified by the latter to the genus Pseudonigrita. Adults have a large black cap, ivory-colored bill, red eyes, brown back and wings, blackish-brown tail, white throat and underparts with a black midline, and dark horn-colored legs. It breeds in colonies and roofed nests with an entrance at the bottom in thorny trees such as acacias are constructed by the male from grass stems. It is found in parts of Ethiopia, Kenya, Somalia, and Tanzania. It is sometimes kept and bred in captivity. [2]

Contents

PhiletaerusCabanisiKeulemans.jpg

Taxonomy and systematics

In 1884, the black-capped social weaver was first described by German East-Africa explorer Gustav Fischer and German ornithologist Anton Reichenow as Nigrita cabanisi, based on a specimen collected in 1883 by Fischer in the Pare Mountains. In 1903, Reichenow assigned the species to his newly erected genus Pseudonigrita , because he considered P. arnaudi and P. cabanisi related to weaverbirds (Ploceidae), while the other species Nigrita bicolor , N. canicapillus , N. fusconota and N. luteifrons are negrofinches assigned to the estrildid finches. In 1942, Hans von Boetticher was of the opinion that our species was different enough to assign it to its own genus, and made the new combination Somalita cabanisi. [3] [4] The species name cabanisi, honors Jean Cabanis, a German ornithologist. There are no subtaxa. [5]

"Black-capped social weaver" has been designated the official name by the International Ornithological Committee (IOC). [6] Other common names include Cabanis's social waxbill and black-headed sociable weaver.

Phylogeny

Based on recent DNA-analysis (which did not include P. cabanisi ), the genus Pseudonigrita belongs to the group of sparrow weavers (subfamily Plocepasserinae), and is most related to Philetairus socius . This clade is sister to Plocepasser . [7] Provided that the sister relationship between the Pseudonigrita-species is correct, the following tree expresses current insights.

family  Ploceidae
subfamily Amblyospizinae

Amblyospiza albifrons

subfamily Plocepasserinae

Sporopipes

Plocepasser

Philetairus socius

Pseudonigrita cabanisi

Pseudonigrita arnaudi

subfamily Bubalornithinae

Dinemellia dinemelli

Bubalornis

subfamily Ploceinae

all other weaverbirds

Description

building a nest Black-capped social weavers building nest.jpg
building a nest

The black-capped weaver is 13 cm (5.1 in) long and weighs 18–24 g (0.63–0.85 oz). Adult birds have an extensive and well-delimited black cap that runs from the bill opening, across the crown to the back neck, and also covers the area around the eye and ear. The neck, mantle, wings and rump are evenly brown. The tail is blackish brown. The throat, sides of the neck, breast, belly and vent are white. A clearly visible narrow longitudinal black stripe runs along the middle of belly to the stomach. Some black feathers also mark the side of the breast, but these are often difficult to see as they may partially or completely be covered by the wings. The legs are a dark horn color. The bill is ivory-colored. The eyes are bright red. [2] [8]

Young birds miss the black markings entirely, which instead are the same brownish shade as the mantle and wings. The bill of juveniles is horn-colored and the iris is dark brown. [2]

Distribution and habitat

Pseudonigrita cabanisi occurs in central and southern Ethiopia, much of Kenya, a patch of Somalia towards the tripoint with Ethiopia and Kenya, and in northern Tanzania. The black-capped social weaver prefers semi-arid savannas dominated by acacias and other thorny bushes. [5]

Behaviour and ecology

Spiza americana male 94 231051626 13e01e8125 o cropped.png

Songs and calls

The black-capped social weaver is monogamous and breeds in colonies. It feeds primarily on grass seeds, but also takes juicy vegetation to get enough water, and insects, particularly to feed the nestlings. [5]

Breeding

Favoured nesting trees include Acacia -species, Delonix and Euphorbia, and the roofed nests that are constructed by both male and female, are attached from thin, hanging branches, and are made of many straight grass straws. Nests have two downward-facing entrances, one of which is closed as soon as the eggs are laid until the moment the youngsters fledge. [5] [9] A clutch is made of two to four eggs of 19 mm (0.75 in) long and 14 mm (0.55 in) in diameter, white or pinkish in color, with brown or violet markings. [5]

Aviculture

The black-capped social weaver is sometimes kept and bred in captivity by hobbyists. It can best be kept in a confinement without other bird species, since the best results can be reach with larger groups of this species. Contrary to the grey-capped social weaver, single pairs have been known to breed successfully however. The birds are also very tolerant, and can be combined with other species. A specialised website suggests to provide hanging branches that can be used to attach nests, without plant cover underneath. The rest of the cage may be planted with grass and a few tough shrubs. A large quantity of nesting material, such as grass straws, very thin twigs or coconut fibre must be provided for building the nests. The birds feed primarily on seeds with a smaller percentage of insects, but it is not known what the optimal mix is. In nature they also eat flowers, leaves and fruits, probably as a source of water when surface water is not available. In captivity, for instance cucumber and lettuce can be given. During the breeding season living insects, insect paste or shredded egg is needed to raise the chicks successfully. Fine stone grit and calcium sources, such as shell grit and cuttlebone, need to be provided. Due to its large demand in nesting material, excessive theft may occur if other Plocepasserinae-species are kept in the same confinement. This website notes that males sometimes throw chicks out of the nest. Replacing mealworms by small crickets may help combat this undesirable behaviour. [2]

Related Research Articles

<span class="mw-page-title-main">Ploceidae</span> Family of small passerine birds

Ploceidae is a family of small passerine birds, many of which are called weavers, weaverbirds, weaver finches and bishops. These names come from the nests of intricately woven vegetation created by birds in this family. In most recent classifications, Ploceidae is a clade, which excludes some birds that have historically been placed in the family, such as some of the sparrows, but which includes the monotypic subfamily Amblyospizinae. The family is believed to have originated in the mid-Miocene. All birds of the Ploceidae are native to the Old World, most in Africa south of the Sahara, though a few live in tropical areas of Asia. A few species have been introduced outside their native range.

<span class="mw-page-title-main">Indian silverbill</span> Species of bird

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<span class="mw-page-title-main">Village weaver</span> Species of bird in the Ploceidae family

The village weaver , also known as the spotted-backed weaver or black-headed weaver, is a species of bird in the family Ploceidae found in much of sub-Saharan Africa. It has also been introduced to Portugal and Venezuela as well as to the islands of Hispaniola, Martinique, Puerto Rico, Mauritius and Réunion.

<span class="mw-page-title-main">Red-billed quelea</span> A small, migratory weaver bird native to Sub-Saharan Africa

The red-billed quelea, also known as the red-billed weaver or red-billed dioch, is a small—approximately 12 cm (4.7 in) long and weighing 15–26 g (0.53–0.92 oz)—migratory, sparrow-like bird of the weaver family, Ploceidae, native to Sub-Saharan Africa.

<span class="mw-page-title-main">Chestnut sparrow</span> Species of bird

The chestnut sparrow is a species of passerine bird in the sparrow family Passeridae. It is the smallest member of the sparrow family, at about 11 cm (4.3 in) long. The breeding male has deep chestnut plumage and the female and juvenile are coloured a duller grey with some chestnut markings. Like its closest relatives in the genus Passer, the Arabian golden sparrow and the Sudan golden sparrow, it is gregarious and found in arid areas. Ranging through the east of Africa from Darfur in Sudan to Tanzania, it is found in dry savanna, papyrus swamps, and near human habitation. Adults and juveniles both feed mostly on grass seeds, and fly in flocks, often with other species of birds, to find food. It nests in trees, building its own domed nests, and also usurping the more elaborate nests of weavers.

<span class="mw-page-title-main">Cape sparrow</span> A small passerine bird from southern Africa

The Cape sparrow, or mossie, is a bird of the sparrow family Passeridae found in southern Africa. A medium-sized sparrow at 14–16 centimetres (5.5–6.3 in), it has distinctive plumage, including large pale head stripes in both sexes. Its plumage is mostly grey, brown, and chestnut, and the male has some bold black and white markings on its head and neck. The species inhabits semi-arid savannah, cultivated areas, and towns, and ranges from the central coast of Angola to eastern South Africa and Eswatini. Three subspecies are distinguished in different parts of its range.

<span class="mw-page-title-main">Baya weaver</span> Species of bird found in southeast Asia

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<span class="mw-page-title-main">White-headed buffalo weaver</span> Species of bird

The white-headed buffalo weaver or white-faced buffalo-weaver is a species of passerine bird in the family Ploceidae native to East Africa. The buffalo part of its name derives from its habit of following the African buffalo, feeding on disturbed insects. Two subspecies are recognized.

<span class="mw-page-title-main">Blue waxbill</span> Species of bird

The blue waxbill, also called southern blue waxbill, blue-breasted waxbill, southern cordon-bleu, blue-cheeked cordon-bleu, blue-breasted cordon-bleu and Angola cordon-bleu, is a common species of estrildid finch found in Southern Africa. It is also relatively commonly kept as an aviary bird.

<span class="mw-page-title-main">White-browed sparrow-weaver</span> Species of bird

The white-browed sparrow-weaver is a predominantly brown, sparrow-sized bird found throughout central and north-central southern Africa. It is found in groups of two to eleven individuals consisting of one breeding pair and other non-reproductive individuals.

<span class="mw-page-title-main">Red-billed buffalo weaver</span> Species of bird

The red-billed buffalo weaver is a species of bird in the family Ploceidae. It is found in eastern and southern Africa. Its natural habitat is the dry savanna.

<span class="mw-page-title-main">Sociable weaver</span> Species of bird

The sociable weaver is a species of bird in the weaver family that is endemic to southern Africa. It is the only species in the monotypic genus Philetairus. It is found in South Africa, Namibia, and Botswana. but their range is centered within the Northern Cape Province of South Africa. They build large compound community nests, a rarity among birds. These nests are perhaps the most spectacular structure built by any bird.

<span class="mw-page-title-main">Sparrow-weaver</span> Genus of birds

The sparrow-weavers (Plocepasser) are a genus of birds in the family Ploceidae (weavers), but some taxonomic authorities place them in the family Passeridae.

<span class="mw-page-title-main">Orange weaver</span> Species of bird

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<span class="mw-page-title-main">Baglafecht weaver</span> Species of bird

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<span class="mw-page-title-main">Taveta weaver</span> Species of bird

The Taveta weaver, also known as the Taveta golden weaver, is a species of bird in the weaver family, Ploceidae. It is found on the African savannah in Kenya and Tanzania. The name of the bird comes from the unique markings/coloration of the bird, as well as how these birds weave intricate nests.

<span class="mw-page-title-main">Nelicourvi weaver</span> Species of bird

The nelicourvi weaver is a species of bird in the family Ploceidae. It is endemic to Madagascar. Together with its closest relative, the sakalava weaver, it is sometimes placed in a separate genus Nelicurvius. A slender, sparrow-like bird, it is 15 cm (5.9 in) long and weighing 20–28 g (0.71–0.99 oz). Breeding males have a black bill and head, brown eyes, yellow collar, grey belly, chestnut-brown lower tail coverts, olive back, and blackish flight feathers edged greenish. Non-breeding males have mottled grey and green heads. In the breeding female the front of the head is yellow and the back olive green, with a broad yellow eyebrow. It builds solitary, roofed, retort-shaped nests, hanging by a rope from a branch, vine or bamboo stem, in an open space. It primarily feeds on insects, looking on its own or in very small groups, often together with long-billed bernieria. Its natural habitat is subtropical or tropical moist lowland and mountain forests. The conservation status of Nelicourvi weaver is least concern according to the IUCN Red List.

<span class="mw-page-title-main">Sakalava weaver</span> Species of bird

The Sakalava weaver sometimes known as the Sakalava fody is a species of bird in the family Ploceidae. It is endemic to Madagascar. The bird is 15 cm (5.9 in) long and weighs 20–28 g (0.71–0.99 oz).

<span class="mw-page-title-main">Grey-capped social weaver</span> Species of bird

The grey-capped social weaver is a sparrow-like liver-colored bird, with a pale grey crown, a dark grey bill, a whitish eye-ring, horn-colored legs, with some black in the wing and a light terminal band in the tail, that builds roofed nests made of straws, breeds in colonies in thorny Acacia trees, and feeds in groups gathering grass seeds and insects. Male and female have near identical plumage. DNA-analysis confirms it is part of the weaver family. It is found in Ethiopia, Kenya, Somalia, South Sudan, Sudan, Tanzania, and Uganda.

<i>Pseudonigrita</i> Genus of birds

Pseudonigrita is a genus of sparrow-like birds in the weaverbird family.

References

  1. BirdLife International (2018). "Pseudonigrita cabanisi". IUCN Red List of Threatened Species . 2018: e.T22718725A132119807. doi: 10.2305/IUCN.UK.2018-2.RLTS.T22718725A132119807.en . Retrieved 11 November 2021.
  2. 1 2 3 4 "Zwartkapwever Pseudonigrita cabanisi". Werkgroep voor Ploceidae (in Dutch). Retrieved 21 April 2017.
  3. "Zwartkapwever". vogelsbekijken.be (in Dutch). Archived from the original on 24 April 2017. Retrieved 23 April 2017.
  4. Boetticher, Hans von (1942). "Der kleine Schwarzkopf-Sperlingsweber" (PDF). Verhandlungen der Ornithologischen Gesellschaft in Bayern. 22 (2): 207–210. Retrieved 23 April 2017.
  5. 1 2 3 4 5 "black-capped Social Weaver Pseudonigrita cabanisi". Weaver Watch - Monitoring the Weavers of the World. Retrieved 21 April 2017.
  6. Gill, Frank; Donsker, David, eds. (2017). "Old World sparrows, snowfinches & weavers". World Bird List Version 7.1. International Ornithologists' Union. Retrieved 16 April 2017.
  7. De Silva, Thilina N.; Peterson, A. Townsend; Bates, John M.; Fernandoa, Sumudu W.; Girard, Matthew G. (2017). "Phylogenetic relationships of weaverbirds (Aves: Ploceidae): A first robust phylogeny based on mitochondrial and nuclear markers". Molecular Phylogenetics and Evolution. 109: 21–32. doi:10.1016/j.ympev.2016.12.013. PMID   28012957.
  8. Packham, Chris (2015). Wildlife of the World. Dorling Kindersley Ltd. p. 205. ISBN   9780241247143 . Retrieved 23 April 2017.
  9. Collias, Nicholas E.; Collias, Elsie C. (2014). Nest Building and Bird Behavior. Princeton University Press. ISBN   9781400853625 . Retrieved 21 April 2017.