|Male in Bigodi Swamp, Uganda|
The black bishop was first described by the German ornithologist Jean Cabanis in 1880 and named after H. Gierow, a Swedish explorer and collector in Angola. It is sometimes placed with E. aureus and E. hordeaceus in a separate genus, Groteiplectes.
A study of the molecular phylogeny of bishops and widowbirds published in 2008 found that it formed part of a clade along with the fire-fronted bishop (E. diadematus), black-winged red bishop (E. hordeaceus), northern red bishop (E. franciscanus), southern red bishop (E. orix), Zanzibar red bishop (E. nigroventris) and red-collared widowbird (E. ardens). An alternate common name is Gierow's bishop.
- E. g. ansorgei (E. Hartert, 1899), or northern black bishop, inhabits Cameroon, the Central African Republic, Republic of the Congo, Democratic Republic of the Congo, South Sudan, Ethiopia, Uganda, and Kenya — especially around Lake Victoria basin and Kakamega. This subspecies is named after its discoverer Dr. W. J. Ansorge.
- E. g. gierowii Cabanis, 1880, known as the Angola black bishop, inhabits Angola and the Democratic Republic of the Congo.
- E. g. friederichseni Fischer and A. Reichenow, 1884, or southern black bishop, inhabits Kenya and Tanzania around Babati, and sporadically to Lake Manyara and Serengeti National Park; possibly along Southern Uaso Nyiro River.
At 14 to 16 cm (5.5–6.3 in), the black bishop is large for its genus. The breeding male is black on the wings, tail, chest, cheeks and forehead. The neck, back of the head and breast band) are orange or orange-red. The under tail-coverts are pale buff with black streaks, and the upper back is yellow or orange-yellow in subspecies ansorgei, and orange in friederichseni. The throat is scarlet in the nominate subspecies and black in ansorgei. The subspecies friederichseni has the undertail coverts isabelline. The upper back is golden yellow and the rump is brown. The conical bill, characteristic of finches, is black and the tarsus is brown. Females are dark, including the sides of the face, have boldly spotted under tail-coverts, and dark spots on a buff breast. The female's wing linings are black. The non-breeding male is black on the back, wings and rump, with yellowish supercilia and chin; the sides of face and breast are tawny buff. The juvenile resembles the female but has smaller breast spots. The calls comprise various subdued twittering sounds, including see-zee see-zee see-zhe see-zhe SEE-ZHEE, zee-zee-zeezee-zee, and hishaah, hishaah, SHAAAAAAH, tsee-tseet-tseet-tseet.
Distribution and habitat
The black bishop is native to Angola, Cameroon, Central African Republic, Republic of the Congo, Democratic Republic of the Congo, Ethiopia, Kenya, South Sudan, Tanzania, and Uganda. Its preferred habitats are grasslands, shrublands, and wetlands.
The black bishop can sometimes be found in small flocks, but is not a highly gregarious species, especially when nesting. It is probably polygynous. The male defends the territory during breeding season.
- BirdLife International (2012). "Euplectes gierowii". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
- "Black Bishop Euplectes gierowii". BirdLife International. Retrieved 30 May 2011.
- Jobling, James A. (1991). A Dictionary of Scientific Bird Names. Oxford University Press. p. 94. ISBN 0-19-854634-3.
- "Black Bishop (Euplectes gierowii)". Internet Bird Collection (IBC). Retrieved 30 May 2011.
- Prager, M.; Johansson, E. I. A.; Andersson, S. (2008). "A molecular phylogeny of the African widowbirds and bishops, Euplectes spp. (Aves: Passeridae: Ploceinae)". Molecular Phylogenetics and Evolution 46 (1): 290–302. doi:10.1016/j.ympev.2007.09.010. PMID 17964815.
- Mayr, E & J C Greenway, Jr., ed. (1962). Check-List of Birds of the World. Volume 15. Cambridge, Massachusetts: Museum of Comparative Zoology. p. 66.
- Zimmerman, Dale A.; Pearson, David J.; Turner, Donald A. (2005). Birds of Kenya and Northern Tanzania. London: Christopher Helm. p. 545. ISBN 978-0-7136-7550-4.
- Ansorge, W. J. (1899). Under the African sun. New York: Longmans, Green, and Co. p. 344.
- Williams, John G; Arlott, Norman (1980). A Field Guide to the Birds of East Africa. London: Collins. p. 377. ISBN 0-00-219179-2.
- Craig, Adrian J. F. K. (1980). "Behaviour and evolution in the genus Euplectes". Journal of Ornithology 121 (2): 144–161. doi:10.1007/BF01642928.
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