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Trigonoceps occipitalis

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA CHORDATA AVES ACCIPITRIFORMES ACCIPITRIDAE

Scientific Name: Trigonoceps occipitalis
Species Authority: (Burchell, 1824)
Common Name(s):
English White-headed Vulture
French Vautour à tête blanche

Assessment Information [top]

Red List Category & Criteria: Vulnerable C1+2a(ii) ver 3.1
Year Published: 2012
Date Assessed: 2012-05-01
Assessor(s): BirdLife International
Reviewer(s): Taylor, J. & Butchart, S.
Contributor(s): Baker, N., Barlow, C., Bowden, C., Brown, C., Davies, R., Dowsett, R., Dowsett-Lemaire, F., Genero, F., Hall, P., Ndang'ang'a, P., Pomeroy, D., Simmons, R., Thiollay, J., Wolstencroft, J., Brouwer, J. & Kendall, C.
Facilitator/Compiler(s): Bird, J., Butchart, S., Ekstrom, J., Evans, M., Harding, M., Martin, R, Pilgrim, J., Taylor, J., Symes, A.
Justification:
This species has a small population which constitutes a single metapopulation as there is presumed to be movement of individuals within its large range. It is listed as Vulnerable because information from across its range indicates that numbers are in decline owing to a variety of threats.

Geographic Range [top]

Range Description: Trigonoceps occipitalis has an extremely large range in sub-Saharan Africa (from Senegal, Gambia and Guinea-Bissau disjunctly east to Eritrea, Ethiopia and Somalia, and south to easternmost South Africa and Swaziland), where it is uncommon to locally common, but generally widespread outside forested regions (Harrison et al. 1997). It has declined rapidly in parts of West Africa since the early 1940s (P. Hall in litt. 1999, J. M. Thiollay in litt. 2006, 2012), is declining in East Africa (Virani et al. 2011) and in southern Africa is now largely confined to protected areas. In Botswana only four nests were located during gyrocopter surveys of three Important Bird Areas during 2008 and the species has the lowest relative abundance of the vulture species recorded (Hancock 2008), while in Niger there are only four records since 1995, all in the Gadabeji area (J. Brouwer in litt. 2012). The species has probably declined in central Mozambique (Parker 2005a), where the population is estimated at 200 pairs (Parker 2005b). An extrapolated estimate of the global population suggested there were 2,600-4,700 pairs (7,000-12,500 mature individuals) (Mundy et al. 1992).

Countries:
Native:
Angola (Angola); Benin; Botswana; Burkina Faso; Burundi; Cameroon; Central African Republic; Chad; Congo, The Democratic Republic of the; Côte d'Ivoire; Djibouti; Eritrea; Ethiopia; Gabon; Gambia; Ghana; Guinea; Guinea-Bissau; Kenya; Malawi; Mali; Mauritania; Mozambique; Namibia; Niger; Nigeria; Rwanda; Senegal; Somalia; South Africa; South Sudan; Sudan; Swaziland; Tanzania, United Republic of; Togo; Uganda; Zambia; Zimbabwe
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: An estimate of 7,000-12,500 mature individuals was extrapolated from a number of regional estimates. This equates to 10,500-18,750 individuals in total, here rounded to 10,000-20,000 individuals.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: It prefers mixed, dry woodland at low altitudes, avoiding semi-arid thornbelt areas (Mundy et al. 1992). It also occurs up to 4,000 m in Ethiopia, and perhaps 3,000 m in Kenya, and ranges across the thorny Acacia-dominated landscape of Botswana (Mundy et al. 1992). It generally avoids human habitation (Mundy et al. 1992). The species is thought to be a long-lived resident that maintains a territory (del Hoyo et al. 1994). It may generally fly lower than other vultures, and is often the first vulture species to arrive at carcasses (Mundy et al. 1992). While it is often found on the periphery of vulture congregations at large carcasses, it is also often found at small carcasses and is probably an occasional predator (Mundy et al. 1992, F. Dowsett-Lemaire in litt. 2006). It nests and roosts in trees, most nests being in Acacia spp. or baobabs (Mundy et al. 1992). Clutch size is one, the egg being laid a couple of months after rains have finished and the dry season is underway (Mundy et al. 1992). Pairs that breed have a success rate of 65-75%, however, up to 61% of pairs do not attempt to breed each year (Mundy et al. 1992, del Hoyo et al. 1994).

Systems: Terrestrial

Threats [top]

Major Threat(s): Reductions in populations of medium-sized mammals and wild ungulates, as well as habitat conversion throughout its range best explain the current decline (Mundy et al. 1992, P. Hall in litt. 1999, R. Davies in litt. 2006). Additional threats include indirect poisoning (R. Davies in litt. 2006) at baits set to kill jackals in small-stock farming areas, and in East Africa at poisoned baits set for larger mammalian carnivores such as lions and hyenas (C. Kendall in litt. 2012), and, particularly in East Africa, secondary poisoning from carbofuran (Otieno et al. 2010), although this species may be less susceptible than other vultures owing to its broad diet. Exploitation for the international trade in raptors (N. Baker in litt. 2006) also poses a threat. In 2005, 30 individuals of this species were confiscated by the Italian authorities (F. Genero in litt. 2005). In South Africa, this species is captured for use in traditional medicines (R. E. Simmons and C. J. Brown in litt. 2006). Breeding birds may readily desert nests in areas of high human disturbance (R. E. Simmons and C. J. Brown in litt. 2006). The species is highly sensitive to land-use and is highly concentrated in protected areas (Hancock 2008). Potential introduction of the non-steroidal anti-inflammatory drug diclofenac, which is fatal to Gyps spp. when ingested at livestock carcasses may represent a potential future threat to the species.

Conservation Actions [top]

Conservation Actions: Conservation Actions Underway
This species currently occurs throughout much of southern and East Africa's protected areas network (F. Dowsett-Lemaire in litt. 2006). It is classified as vulnerable in Namibia and South Africa (R. E. Simmons and C. J. Brown in litt. 2006). Individuals were marked with patagial tags in Fouta Djallon vulture sanctuary, Guinea, in 2007 to monitor movements and for a toxicological assessment of the vulture population of the park (Rondeau 2008). In 2007, a survey began to establish the extent of diclofenac use for veterinary purposes in Tanzania (BirdLife International 2007), and in 2008 an awareness-raising campaign at a conference of the World Organisation for Animal Health in Senegal led to a resolution being adopted unanimously by more than 160 delegates to "request Members to consider their national situation with the aim to seek measures to find solutions to the problems caused by the administration of diclofenac in livestock" (Woodford et al. 2008).

Conservation Actions Proposed
Carry out co-ordinated surveys throughout the range of this species to clarify its population size and trends. Raise awareness about the impact of poisoning on this species (R. E. Simmons and C. J. Brown in litt. 2006). Enforce anti-poisoning legislation (R. E. Simmons and C. J. Brown in litt. 2006). Minimise disturbance at nests (C. Kendall in litt. 2012). Eliminate the veterinary use of diclofenac and other toxic drugs in Africa. Limit the hunting of game to improve the availability of carrion. Carry out education and awareness programmes, particularly targetted at farmers, to reduce persecution, unintentional poisoning and hunting for cultural reasons.


Citation: BirdLife International 2012. Trigonoceps occipitalis. The IUCN Red List of Threatened Species. Version 2014.2. <www.iucnredlist.org>. Downloaded on 30 September 2014.
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