Cuckoo-finch

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Cuckoo-finch
Parasitic Weaver (Anomalospiza imberbis).jpg
Midmar Game Reserve, KwaZulu-Natal, South Africa.
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Viduidae
Genus: Anomalospiza
Shelley, 1901
Species: A. imberbis
Binomial name
Anomalospiza imberbis
(Cabanis, 1868)
Synonyms

Crithagra imberbis Cabanis, 1868

The cuckoo-finch (Anomalospiza imberbis), also known as the parasitic weaver or cuckoo weaver, is a small passerine bird now placed in the family Viduidae with the indigobirds and whydahs. It occurs in grassland in Africa south of the Sahara. The male is mainly yellow and green while the female is buff with dark streaks. The eggs are laid in the nests of other birds.[2]

Description[edit]

The cuckoo-finch is a small finch-like bird, about 11–13 cm long.[3] It has a short tail, large legs and feet, and a large, deep, conical bill. The adult male has a black bill and a yellow head and underparts. The upperparts are olive-green with black streaks.[4] The yellow areas become increasingly bright prior to the breeding season as the feathers become worn.[5] The adult female is buff with heavy black streaking above and light streaks on the flanks; its face is largely plain buff and the throat is buff-white.[3][4]

It has various chattering calls.[6] Displaying males have a nasal song.[4]

Taxonomy[edit]

Trapped bird at Polokwane, Limpopo

The species was described in 1868 by the German ornithologist Jean Cabanis based on a specimen from East Africa, probably from the coast opposite Zanzibar.[7] It was initially placed in the genus Crithagra but later moved to a genus of its own, Anomalospiza. The name of the genus means "anomalous finch" with spiza being a Greek word for finch. The specific name imberbis comes from Latin and means "beardless".[8]

Its closest relatives are thought to be the indigobirds and whydahs of the genus Vidua.[9] These birds are now usually considered to form a family, Viduidae. Previously they were treated as a subfamily, Viduinae, within either the estrildid finch family, Estrildidae, or the weaver family, Ploceidae.[2]

Distribution and habitat[edit]

The cuckoo-finch has a scattered distribution across sub-Saharan Africa where it occurs in open or lightly wooded grassland, especially near damp areas.[5]

In West Africa, it occurs in Guinea, Sierra Leone, the Ivory Coast, Ghana, Togo, Benin, eastern Nigeria, and north-west Cameroon with vagrant records from Gambia and Mali.[10] Further east it is found in South Sudan, Ethiopia, Uganda, Kenya, Tanzania, Rwanda, Burundi, southern and eastern parts of the Democratic Republic of the Congo and locally in the Republic of the Congo.[3][10] In southern Africa, it occurs in Malawi, Zambia, southern and eastern Angola, north-east Namibia, northern and eastern Botswana, Zimbabwe, Mozambique, eastern South Africa, and Swaziland.[11]

It has a large range and an apparently stable population and so is classified as least concern by BirdLife International.[12]

Behaviour[edit]

Cuckoo-finch eggs (right two columns) closely resemble the eggs of their host species (tawny-flanked prinia and red-faced cisticola shown).

The cuckoo-finch typically occurs in pairs or small flocks during the breeding season and larger flocks outside the breeding season. It forages on the ground or perched on the flower heads of grasses or herbs. It feeds mainly on grass seeds.[6]

The species is an obligate brood parasite, laying its eggs in the nests of cisticolas and prinias. The eggs are white, pale blue or pink with brown, reddish or violet markings. They are 17–17.3 mm long and 12.5–13 mm wide. The eggs are incubated for 14 days.[6] The young bird fledges after 18 days and remains dependent on its hosts for another 10–40 days.[5] The young of the host bird usually disappear although there have been records of the host's nestlings surviving alongside the young cuckoo-finch.[5][6] Sometimes two cuckoo-finch chicks have been found in the same nest.[5]

References[edit]

  1. ^ BirdLife International (2012). "Anomalospiza imberbis". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013. 
  2. ^ a b Payne, Robert (2010). "Family Viduidae (Whydahs and Indigobirds)". In del Hoyo, Josep; Elliott, Andrew; Christie, David. Handbook of the Birds of the World. Volume 15: Weavers to New World Warblers. Barcelona: Lynx Edicions. ISBN 978-84-96553-45-3. 
  3. ^ a b c Sinclair, Ian; Peter Ryan (2003). Birds of Africa south of the Sahara. Cape Town: Struik. 
  4. ^ a b c Zimmerman, Dale A.; Donald A. Turner, Donald; David J. Pearson (1999). Birds of Kenya & Northern Tanzania. London: Christopher Helm. 
  5. ^ a b c d e Johnsgard, Paul A. (1997). The Avian Brood Parasites: Deception at the Nest. Oxford University Press. 
  6. ^ a b c d McLachlan G. R.; Liversidge, R. (1981). Roberts Birds of South Africa. Cape Town: John Voelcker Bird Book Fund. ISBN 0-620-03118-2. 
  7. ^ Lowther, Peter E. (2005). "Host list of avian brood parasites - 5 - Passeriformes: Viduidae" (PDF). Retrieved 17 January 2010. 
  8. ^ Kidd, D. A. (2003). Collins Gem Latin Dictionary. Collins. 
  9. ^ Sorenson, Michael D.; Robert B. Payne (2001). "A single ancient origin of brood parasitism in African finches: implications for host-parasite coevolution". Evolution. 55 (12): 2550–2567. doi:10.1554/0014-3820(2001)055[2550:ASAOOB]2.0.CO;2. PMID 11831669. 
  10. ^ a b van Perlo, Ber (2002). Collins Illustrated Checklist: Birds of Western and Central Africa. London: Collins. 
  11. ^ van Perlo, Ber (1999). Collins Illustrated Checklist: Birds of Southern Africa. London: Collins. 
  12. ^ BirdLife International (2009) ["Archived copy". Archived from the original on 2007-07-10. Retrieved 2014-04-01. /datazone/species/index.html?action=SpcHTMDetails.asp&sid=8596&m=0 Species factsheet: Anomalospiza imberbis]. Downloaded from "Archived copy". Archived from the original on 2007-07-10. Retrieved 2014-04-01.  on 17 January 2010.

External links[edit]