Cataloguer la collection de peaux d'oiseaux de Lubango : vers un atlas des répartitions des oiseaux angolais. La collection de peaux d'oiseaux logée à Lubango, Angola, comprend plus de 40.000 spécimens, representant plus de 850 taxons. En juin 2008, nous avons travaillé sur la collection pendant deux semaines, afin de collecter des données concernant la distribution des especes. Ces travaux font partie d'un projet atlas pour les oiseaux de l'Angola. La collection est toujours en bon état et le «Instituto Superior da Ciências e Educação" (ISCED), qui abrite la collection, doit en être félicité. Les donnees mentionnées sur les étiquettes de 15.000 peaux, dont celles de tous les spécimens des especes moins connues, ont été saisies dans une base de données informatisée. Les 25.000 enregistrements restants sont faits sur la base de photos des «fiches de catalogue*. Les spécimens les plus intéressants sont ceux de quatre Aigrettes vineuses Egretta vinaceigula - les premières donnees pour l'Angola de cette espèce cataloguée mondialement <<Vulnérable >>. D'autres exemples de peaux intéressantes sont illustrés par des photos et attirent l'attention sur l'importance de la collection pour des études systématiques. La collection de mammifères est aussi mentionnée brievement. Enfin, des recommandations sont faites pour la gestion future de la collection.
Summary. The bird collection housed in Lubango, Angola, contains more than 40,000 skins, representing more than 850 taxa. As part of an atlas project for Angolan birds, we visited the skin collection for two weeks in June 2008, to extract distributional information from the specimens. The skin collection is still in good condition, and the Institute Superior da Ciências e Educação (ISCED), which houses the collection, is to be commended for this. Data from labels of 15,000 skins were entered into an electronic database, including all specimens of lesser known species. The remaining 25,000 entries are being made from photographs of 'catalogue' cards. The most interesting specimens are four Slaty Egrets Egretta vinaceigula, the first records of this globally Vulnerable species in Angola. Other examples of interesting skins are illustrated in various photographs, drawing attention to the importance of the collection for systematic studies. A brief mention is also made of the mammal collection. Finally, a list of recommendations is given for the future management of the collection.
With the sixth-longest bird list of any African country, Angola harbours an exceptionally rich biodiversity. Add to this one of Africa's highest bird conservation priorities - the Western Angola Endemic Bird Area (Stattersfield et al. 1998) and its biologically important scarp forests - and the biological importance of the country becomes unquestionable. During the 1960s and 1970s the country's biodiversity was investigated, plant and animal collections established, and several reserves were appropriately managed (Huntley 1974), but 30 years of civil unrest have left conservation and research in Angola well behind that of other southern African countries. Basic information on species distributions is poor, and the network of reserves is dysfunctional.
Recent peace and stability have provided new opportunities for improving the situation. As a first step, old reserves need to be re-established, knowledge of species distributions updated and refined, key gaps in the conservation network identified and remedied, and links built with Angolan counterparts. Whilst available data on Angolan bird distributions were recently summarised (Dean 2000), the contents of the largest collection of Angolan bird skins, referred to here as the Lubango Bird Skin Collection (LBSC), were largely unknown. Summaries based on some information contained in the LBSC were published by Pinto (1970, 1972, 1973, 1983), but the collection of more than 40,000 specimens must be considered the largest untapped source of information on Angola bird distributions, and a primary source for systematic research. A sizeable collection of mammal skins and skulls is also housed here.
The aim of our visit to Lubango was fourfold: (1) to report on the condition of the LBSC and make recommendations for its future management, (2) to garner valuable distributional information from the LBSC on birds (and to a lesser degree bats), (3) to draw attention to the value of the collection for study purposes, and (4) to build links for future research and capacity building in Angola, centred on the collection. Here we report on the condition of the LBSC and make recommendations for its future management and use, draw attention to the importance of the collection by highlighting its contents, and provide a progress report on the cataloguing of the skin collection. Links with Angolan counterparts are being developed on several fronts, most notably through the work of Brian Huntley and colleagues of the South African National Biodiversity Institute (SANBI), but are not reported on here.
Short history of the skin collection and collecting in Angola
The LBSC is one of the largest collections of bird specimens in south-central Africa and contains many well-prepared specimens, comparable in quality to any collection in Africa. The collection is a tribute to the late Dr Antonio da Rosa Pinto, who, in 1958, began the nucleus of the collection by leading a collecting trip to Moxico Province, in the east of the country. At the time, Dr Pinto was a teacher at Salazar High School in Lourenço Marques (now Maputo) in Mozambique, and was in Angola on an official 'temporary' mission with the objective of establishing an Ornithology Department at the Institute de Investigação Cientifica de Angola (IICA). In 1963 Dr Pinto was appointed leader of the Centre for Studies at the IICA in Lubango. He subsequently managed to gather a very competent group of collectors and taxidermists, most of them Angolans, familiar with the birds and the countryside. This group, usually a team of six men but involving over 60 different personnel over the years, served the IICA well by establishing a collection of over 40,000 specimens, representing almost all of the avian taxa known to occur in Angola. The collection is currently housed at the the Institute Superior da Ciências e Educação (ISCED), whose staff is to be commended for maintaining the collection in excellent condition.
Although the collection at Lubango contains very little 'old' material, there is a long history of collecting natural history specimens in Angola. Bird collections had commenced by the 1850s, with visits by Dr Francisco Welwitsch, a botanist who collected some birds between 1853 and 1860, and Joaquim Monteiro, a mining engineer who collected birds in 1858-67. Collecting activity at about this time was stimulated by requests for bird specimens from Prof. J. V. du Bocage in Portugal, who requested that military and administrative officers in Angola collect birds for him. Also, in 1864, José Alberto D'Oliviera Anchieta went to Angola to collect birds for Prof. Bocage. His first collection, said to be 'rich', was lost in a shipwreck
(Pinto 1983). Anchieta returned to Angola in 1866, and remained in the country until his death in 1897. He worked mostly in central and western Angola, collecting almost 4,400 specimens of 460 species of birds, of which 46 were new species to science.
A number of collectors of many different nationalities followed Anchieta in the late 1800s; O. Sala (Dutch), C. J. Andersson (Dean et al. 2006; Swedish), A. W. Eriksson (Swedish), C. Hamilton (British), J. Falkenstein (German), L. Petit and A. Lucan (French), O. Schiitt and F. W. von Mechow (Steinheimer & Dean 2007; German), P. J. van der Kellen (Dutch) and the Valdivia Expedition. Many of these are remembered in the names of Angolan birds. With interest growing in the natural history of Angola, expeditions sponsored by museums began to visit the country in the early 1900s: the French mission of Rohan-Cabot (Menegaux & Berlioz 1923), the Swiss scientific expedition to Angola in 1928-29 (Monard 1934), the Phipps-Bradley expedition (with Rudyerd Boulton as collector), the Vernay-Angola expedition and collecting trips by Hubert Lynes and Jack Vincent (Lynes & Sclater 1933, 1934), and the Pulitzer-Angola expedition, again with Rudyerd Boulton as collector. Boulton subsequently collected and described a new endemic species, Pulitzer's Longbill Macrosphenus pulitzeri (Boulton 1931). In 1929-30, the Gray African Expedition of the Academy of Natural Sciences, Philadelphia, collected birds and mammals in central-western Angola (Bowen 1931, 1932), and an Italian expedition in 1930 collected the holotype of an endemic subspecies of Lüihder's Bushshrike Laniarius luehderi amboinensis (Moltoni 1932). Individuals, some sponsored by museums and owners of private collections, were also active in Angola during the early 1900s. Dr William Ansorge made several trips to Angola between 1903 and 1909, collecting c.8,000 bird specimens (and many previously undescribed freshwater fish). The Portuguese naturalist Francisco Newton visited Angola at about the same time (de Seabra 1905), C. H. Pemberton collected in 1901-02 and Willoughby Lowe collected some material in the Luanda area in 1910-11 (Bannerman 1912). Important collections in the 1930s were made by Jean Bodaly who collected birds at Chitau, Bie, and by H. K. Prior at Dondi, Huambo. During a similar period, Rudolf Braun, who was resident in Angola, collected some material, most of which is now in the Zoological Museum in Berlin. The last collections of birds in Angola before the Ornithology Department of the IICA was established were made by H. A. Beatty, who collected for the Field Museum in Chicago. In two separate major collecting trips in 1954-55 and 1957, Gerd Heinrich collected birds for the Zoologisches Institut, Hamburg, the Field Museum and the Peabody Museum at Yale University. The Transvaal Museum and the British Museum sponsored expeditions in the 1950s, and both expeditions obtained very useful study material. With the exception of some birds donated to the IICA by Heinrich and the British Museum, most of the specimens collected between 1850 and 1960 in Angola are scattered in museums in Europe, the UK and North America. However, many of the specimens collected in Angola and sent to Portugal in the late 1800s and early 1900s were destroyed in a fire at the University of Lisbon in 1978 (Mearns & Mearns 1998), and many other specimens have not been traced. Fortunately the bird collection at Lubango remains intact and is an extremely important source of reference material for ongoing research on the birds of Angola.
For two weeks in June 2008 the authors worked at the LBSC. Bird specimens were removed from drawers and information displayed on their labels transcribed into an electronic database on laptop computers. The following information was captured for each specimen: specimen number, species name, subspecies, sex, age, weight, collection date and locality, and collector's name. In addition, photographs were taken of many skins, including representatives of all of the rarer specimens. Lesser known species were generally processed first. During the available time, data from 15,000 specimens were captured into the database, covering all of the rarer species. Handwriting on the labels was often hard to read, requiring substantial cleaning of the database, to correct names of collection localities and collectors. This work is ongoing.
In addition to entering data froml abels, specimen 'catalogue' cards were photographed for the entire collection. Each card represents a single species and subspecies, and contains the following information on specimens belonging to the taxon: specimen number, collection date and locality, and sex for each example in the collection. Photographs of these cards (4,661 in total, representing 859 species) have now been labelled and ordered by family. Data entry is continuing using these photographs, but is expected to take at least another 18 months to complete. A small amount of time was dedicated to comparing specimens of similar species, and taking side-by-side photographs, as well as inspecting the mammal collection.
Broadly, the collection remains in excellent condition, free of insect damage. Specimens are housed in wooden drawers lined using paper, in 28 large wooden cupboards. All specimens are labelled and the complete collection of field journals remains with the skins. However, the room in which the collection is kept is incredibly dusty, the field journals are unordered and poorly kept, and a large number of mounted specimens are clumsily arranged, making for poor working conditions. Although the collection has been kept in good condition by Prof. Jose Luis Alexandre and his staff at ISCED, there is no official curator or ornithologist at the collection. The current 'caretaker' of the collection has no training in biology or taxidermy, and the collection remains largely unused. There is not yet an official protocol for access, although permission to work on the collection can be granted by the Dean of ISCED, Prof. Matondo Tomalela. Francisco Miata is employed and trained to maintain and care for the herbarium collection housed here, and a counterpart in the bird collection is urgently needed.
The LBSC is significant for both the number of specimens it contains (>40,000) and the great variety of taxa presented (>850), including numerous rarer species. More than 1,600 photographs of skins were taken, representing >400 species, and have been databased. The most interesting discovery was the presence of four specimens of Slaty Egret Egretta vinaceigula, erroneously labelled as Black Herons E. ardesiaca. These specimens were all collected during a trip to Quiteve, Huila Province, on the banks of the Cunene River (16°02'S 15°11'E), on 19 - 27 June 1968, and constitute the first records of this Vulnerable species for Angola (Dean 2000).
DO worked exclusively on the Ploceidae. Most Angolan Ploceidae are represented in the collection, notable exceptions being Orange Weaver Ploceus aurantius and Slender-billed P. pelzelni. Pinto (1972) listed a specimen of P. pelzelni collected in Cabinda that should have been present in the museum and is listed on the 'catalogue'cards, but it was not found. While the collection generally contains few types, it does house the type series of the subspecies of Scaly-fronted Weaver Sporopipes squamifrons pallidus described by Pinto (1967). Several rare or uncommon weavers are represented: Black-chinned Weaver P. nigrimentus, Loango Weaver P. subpersonatus, Brown-capped Weaver P. insignis, Black Bishop Euplectes gierowii (1 from Tanzania) and Golden-backed Bishop E. aureus. Three specimens of Southern Masked Weaver Ploceus velatus were collected by Pinto from the isolated Lake Dilolo during August 1958 (Pinto 1965, Dean 1996), with further specimens from this expedition housed at the Lisbon Museum (Louette 1984). It has been suggested that these birds belong to the reichardi-ruweti species complex (Dean 2000). The LBSC specimens are dull-plumaged, but one is a male starting to moult: there are a few orange feathers on the upper throat. Other than this orange plumage anomaly (the throat should be turning black), the weavers appear to match nominate Southern Masked Weaver found further south in Angola. The nearest locality for Southern Masked Weaver is in north-west Zambia (Dowsett et al. 2008).
The mammal collection at Lubango consists of skins and skulls of a variety of species. The aim of this expedition was to catalogue the bird collection, thus there was only limited time for AM to examine the mammals, which numbered more than 3,000 specimens of at least 123 species. The bats were examined in greatest detail and included 211 specimens of 23 species. This represents about one third of the 63 species known to occur in Angola. With respect to collecting sites, there is a geographical bias towards the south-east of the country, which is unsurprising since that is where Lubango is situated. The collection includes a number of interesting bat specimens such as two D'Anchieta's Fruit Bat Plerotes anchietae, a species known from just 11 specimens (Bergmans 1989, Kock et al. 1998); 21 specimens of Angolan Epauletted Fruit Bat Epomophorus angolensis, an Angolan near-endemic; and African Sheath-tailed Bat Coleura afra, a widespread species but in southern Africa known from just three specimens (Monadjem et al. in press). Non-chiropteran mammals well represented in the collection include genets (Genetta), hares (Lepus), hyraxes (dassies) (Heterohyrax and Procavia) and at least 33 genera of rodents. Primates are particularly poorly represented with skins of just six species.
Habitats: erosion of biodiversity in the environs of Lubango
The habitats in which birds were collected between 1958 and 1974 ranged from coastal desert through palm and baobab savanna on lowland alluvium along the Cunene River, to grassland and sclerophyllous shrubland on the sandstones of the high-altitude tableland that surrounds Lubango, to escarpment forest along the 'Scarp' and equatorial gallery forest along various rivers. Travelling from northern Namibia to Lubango we passed successively through palm savanna and mopaneveld, baobab savanna, Baikiaea (teak) woodland on yellow sand, mixed woodland with Combretum, Terminalia, Commiphora and Albizia set among spectacular granite hills, and then, at higher altitudes on red sands, miombo woodland. The sandstone plateau above the town of Lubango supports stunted miombo and a high diversity of shrubs including Protea welwitschi and grass trees Xeris sp. Closed Afromontane forest patches occurred in deep, well-watered gorges on the escarpment. When the bird collection was constituted, in 1958-74, the human population of Angola was sparse and most of the woodland in the southern part of Angola was intact. Tall woodland that included large specimens of such hardwoods as Pterocarpus angolensis (kiaat), Combretum (bush willow) and Baikiaea plurijuga (teak) extended from the Namibian border to Lubango.
Human population growth over the past four decades has changed the face(s) of the landscape. Within a 50-km radius of Lubango miombo woodlands have been cleared and replaced with subsistence agriculture based on grain crops, goats and cattle, with charcoal made from large miombo trees as a cash supplement. Further from the city of Lubango bags of charcoal and honey for sale at roadside markets are witness to the continued erosion of the woodland, as trees make way for more subsistence crops, cut to raid bee hives, ringbarked for materials used in medicine or to construct bark hives, and converted to charcoal for heating and cooking in the ever-growing urban centres. Large trees are disappearing in even quite remote areas such as the slopes above the precipitous cliffs of the escarpment at Leba. Smoke rising from the woodland, cut stumps, charcoal pits, paths made by ox-drawn sleds, and feathers of wild birds used to sustain the woodcutters bear silent witness to the ongoing erosion of the natural capital of this beautiful land.
Towards an atlas
One of the objectives of compiling a catalogue and database of the bird specimens in the Lubango collection is to build a georeferenced database of bird specimen records for Angola. These data will be merged with another database, containing data on distributions taken from Traylor (1963), Pinto (1983), Dean (2000) and Mills & Dean (2007), data on bird specimens in other collections and sight records of birds contributed by visitors to Angola. These data will then be mapped, probably at a 15' x 15' scale. The maps will provide guidelines for the recommendation of protected areas and will also provide some basic distribution patterns, useful for modelling effects of climate change and potential environmental disasters (e.g. oil spills from offshore wells along the northern coast). Gap analyses using these data will establish priorities for future ornithological field work in Angola.
Bird atlas studies not only show bird distribution patterns, but more importantly also identify areas for which there are no data. Globally, bird atlases have made a key contribution to conservation, through highlighting the conservation priorities of species (providing fundamental data for Red Data listing) and habitats (e.g. Fishpool & Evans 2001). Angola, emerging from decades of political instability, is a country where knowledge of bird distributions is particularly poor, although the avifauna is diverse. Most surveys and collecting have been conducted in western and north-central Angola, and along the coastal areas and parts of the Mayombe in Cabinda. We do not know whether gaps in the distribution of certain species are 'real' or artefacts of surveys. An atlas will help close these gaps or show whether they are real. This has important implications for conservation in Angola in that attention will then be drawn to areas of high avian species richness, which might also prove to be areas of high species richness amongst other taxa. Identifying focal areas will also lead to an evaluation of land use practices in these areas and an assessment of their impacts; for example, charcoal burning using native woodland (miombo species complex) trees.
Recommendations for the collection
Although the collection is being kept in reasonable condition, conditions can be greatly improved and the collection should be put to practical use. We recommend that the following steps be taken:
• Produce an electronic database of the bird skin collection, which work is in progress, and once the database is complete, copies will be provided to colleagues in Angola and worldwide, to promote work using the skins. Data will start to be made available online via the website of Natural World (www.natworld.org) within the next 12 months.
• Training of (a) young Angolan ornithologist(s), to act as curator for the collection.
• Possible 'adoption' of the collection by a foreign museum to assist with training and to improve the conditions in which skins are kept.
• Cleaning of the entire room in which the skins are housed.
• Properly organising all documents pertaining to the collection.
• Cleaning and cataloguing the valuable collection of books associated with the collection.
• Encouraging collaboration between Angolan and foreign researchers, using the skin collection as a point of contact.
• Stimulate interest in Angolan birds by incorporating informative visits to the collection in standard biology courses at the institute and making use of the specimens for student projects.
Given the threats to biodiversity in Angola, it is important that some of the plant and animal collections from the 1970s remain in the country to guide and inspire a new generation of Angolan scientists. With the help of SANBI, other biodiversity experts in the South African Development Community and assistance from outside the region there may still be time to plan a protected area network for Angola that will retain all vegetation types and the associated fauna. Without planning, active protection and initiatives to provide alternative sources of income for the local inhabitants, it is unlikely that the next generation of Angolans will be able to enjoy the beauty of the country and the biological diversity experienced by their grandparents, to taste wild honey, see Giant Sable Hippotragus niger variant in the wild, or even to simply find sufficient wood or charcoal for their daily needs.
Funding for this research came from the generous contributions of Ursula Franke, the African Bird Club Conservation Fund, Tony Dowd and Robert Anglers. Brian Huntley assisted tremendously with organising access to the collection, and with logistical support. Many thanks to Yudo Borges and especially Eduardo & Tanya Traguedo for their help during our visit, and for being such hospitable hosts. Prof. Matondo Tomalela, Dr Fernanda Lages, Prof. Jose Luis Mateus Alexandre and other staff at ISCED were incredibly supportive of our work, and this project would have been impossible without them. Dr Michel Louette, Robert J. Dowsett, Ron Demey and Guy Kirwan commented on an earlier version of this paper.
Bannerman, D. A. 1912. On a collection of birds made by Mr Willoughby P. Lowe on the West Coast of Africa and outlying islands; with field notes by the collectors. Ibis 9(6): 219-268.
Bergmans, W. 1989. Taxonomy and biogeography of African fruit bats (Mammalia, Megachiroptera). 2. The genera Micropteropus Marseille, 1899, Epomops Gray, 1870, Hypsignatus "H. Allen, 1861, Nanonycteris Matschie, 1899 and Plerotes Andersen, 1910. Beaufortia 39: 89-153.
Boulton, R. 1931. New species and subspecies of African birds. Ann. Carneg. Mus. 21: 43-56.
Bowen, W. W. 1931. Angolan birds collected during the Gray African expedition, 1929. Proc. Acad. Nat. Sci. Phil. 83: 263-299.
Bowen, W. W. 1932. Angolan birds collected during the second Gray African expedition, 1930. Proc. Acad. Nat. Sci. Phil. 84: 281-289.
Dean, W. R. J. 1996. The distribution of the Masked Weaver Ploceus velatus in Angola. Bull. Br. Ornithol. Cl. 116:254-256.
Dean, W. R. J. 2000. The Birds of Angola: An Annotated Check-list. BOU Checklist No. 18. Tring: British Ornithologists' Union.
Dean, W. R. J., Sandwith, M. & Milton, S, J. 2006. The bird collections of C. J. Andersson in southern Africa, 1850-1867. Archiv. Nat. Hist. 33: 159-171.
Dowsett, R. J., Aspinwall, D. R. & Dowsett-Lemaire, F. 2008. The Birds of Zambia. An Atlas and Handbook. Liege: Tauraco Press & Aves.
Fishpool, L. D. C. & Evans, M. I. 2001. Important Bird Areas in Africa and Associated Islands: Priority Sites for Conservation. Newbury: Pisces Publications & Cambridge, UK: BirdLife International.
Fry, C. H. & Keith S. (eds.) 2000. The Birds of Africa. Vol. 6. London, UK: Academic Press.
Fry, C. H. & Keith S. (eds.) 2004. The Birds of Africa. Vol. 7. London, UK: Christopher Helm.
Hall, B. P. 1960. The faunistic importance of the scarp of Angola. Ibis 102: 420-442.
Huntley, B. ]. 1974. Outlines of wildlife conservation in Angola. J. South Afr. Wildlife Manag. Assoc. 4: 157-166.
Keith, S., Urban, E. K. & Fry C. H. (eds.) 1992. The Birds of Africa. Vol. 4. London, UK: Academic Press.
Kock, D., Burda, H., Chitaukali, W. N. & Overton, M. J. 1998. Pleroties anchietae (Seabra, 1900) in Malawi, Central Africa (Mammalia: Chiroptera). Z. Saugetierk 63: 114-116.
Louette, M. 1984. The identity of swamp-dwelling weavers in northeast Angola. Bull. Br. Ornithol. Cl. 104: 22-24.
Lynes, H. & Sclater, W. L. 1933, Lynes-Vincent tour in Central and West Africa in 1930-1931. Part I. Ibis 13(3): 694-729.
Lynes, H. & Sclater, W. L. 1934. Lynes-Vincent tour in Central and West Africa in 1930-1931. Part II. Ibis 13(4): 1-51.
Mearns, B. & Mearns, R. 1998. The Bird Collectors. London, UK: Academic Press.
Ménégaux, A. & Berlioz, J. 1923. Mission Rohan-Chabot, Angola et Rhodesia 1912-1914. Oiseaux, Histoire Naturelle 4: 107-155.
Mills, M. S. L. & Dean, W. R. J. 2007. A revision of the avifauna of Angola. Ostrich 78: 55-63.
Moltoni, E. 1932. Uccelli d'Angola raccolti da L. Fenaroh durante la spezione 1930 Baragiola-Durini Am. Soc. ltd. Sci. Nat. Milan 71: 169-178.
Monadjem, A., Taylor, P., Cotterill, F. P. D. & Schoeman, M. C. In press. Bats of Southern Africa: A Biogeographic and Taxonomic Synthesis. Johannesburg: University of the Witwatersrand Press.
Monard, A. 1934. Ornithologie de 1'Angola. Arqu. Museu Bocage. Arq. Mus. Bocage 5: 1-110.
Payne, R. B. & Sorenson, M. D. 2007. Integrative systematics at the species level: plumage, songs and molecular phylogeny of quailfinches Ortygospiza. Bull. Br. Ornithol. Cl. 127: 4-26.
Pinto, A. A. da Rosa. 1965. Contribuicao para o conhecimento da avifauna da regiao nordeste do Distrito do Moxico, Angola. Bol. Inst. Invest, dent. Angola 1(2): 153-249.
Pinto A. A. da Rosa. 1967. Descricao de 4 novas subespecies de aves de Angola. Bol. Inst. Invest. Cient. Angola 4: 29-32.
Pinto A. A. da Rosa. 1970. Um catalogo das aves do Distrito da Huila. Mem. Trab. Institute Invest. Cient. Angola 6.
Pinto, A. A. da Rosa. 1972. Contribuicao para o estudo da avifauna do Distrito de Cabinda (Angola). Mem. Trab. Inst. Invest. Cient. Angola 10: 1-103.
Pinto A. A. da Rosa. 1973. Aditamento a avifauna do Distrito de Mocamedes, Angola. Livro de homenagem ao Professor Fernando Frade Viegas da Costa 700 Aniversdrio: 383-419.
Pinto, A. A. da Rosa. 1983. Ornitologia de Angola. Vol. 1. Lisbon: Institute de Investigafao Cienti'fica Tropical.
Seabra, A. F. 1905. Aves de Angola da exploracao de Francisco Newton em Angola. Ann. Sci. Nat. Porto 9: 153-159.
Sinclair, I. & Ryan, P. 2003. Birds of Africa South of the Sahara. Cape Town: Struik.
Steinheimer, F. D. & Dean, W. R. J. 2007. Avian type specimens and their type localities from Otto Schütt's and Friedrich von Mechow's Angolan collections in the Museum fur Naturkunde of the Humboldt-University of Berlin. Zootaxa 1387: 1-25.
Traylor, M. A. 1963. Check-list of Angolan birds. Publ. Cult. Companhia de Diamantes de Angola 61: 1-250.