Captive large predators killing vultures: exposing captive facilities as an additional source of mortality to highly threatened birds
Keywords:captive big cats, Gyps africanus, Hooded Vulture, Necrosyrtes monachus, Panthera, threat, vulture, White-backed Vulture
Background and objective: African vultures are under pressure from various, well-known anthropogenic threats. Here we describe and aim to highlight a littleknown source of mortality to two Critically Endangered vulture species (Gyps africanus
and Necrosyrtes monachus), as well as the Endangered Cape Vulture (Gyps copropheres) in southern Africa – that of captive big cats killing vultures that land in their enclosures to feed on food scraps or faeces or to bathe in drinking water.
Methods: Personal observations, reports from public, interviews with current and former staff from predator parks and lion hunting ranches.
Discussion: While the spatial and numerical extent of this mortality has not yet been quantified, if it is found to be widespread then failure to address it may present a risk to the regions’ vulture populations.
Conclusion: We encourage captive breeding facilities and regulatory authorities to take appropriate action to prevent free-roaming vultures from coming into contact with captive big cats, and we highlight the need for further research to
determine the spatial extent and magnitude of this threat to African vultures.
Attwell, R.I.G., 1963, ‘Some observations on feeding habits, behaviour and inter-relationships of northern Rhodesian vultures’, Ostrich 34, 235–247, https://doi.org/10.1080/00306525.1963.9633479.
Bashaw, M.J., Bloomsmith, M.A., Marr, M.J. & Maple, T.L., 2003, ‘To hunt or not to hunt? A feeding enrichment experiment
with captive large felids’, Zoo Biology 22, 189–198, https://doi.org/10.1002/zoo.10065.
Bishop, J., McKay, H., Parrott, D. & Allan, J., 2003, ‘Review of international research literature regarding the effectiveness
of auditory bird scaring techniques and potential alternatives’, Central Science Laboratories for the Department for
Environmental Food and Rural Affairs, London, UK.
Buechley, E.B. & Şekercioğlu, C., 2016, ‘The avian scavenger crisis: Looming extinctions, trophic cascades, and loss of critical ecosystem functions’, Biological Conservation 198, 220–228, DOI: 10.1016/j.biocon.2016.04.001.
Clark, F. & King, A.J., 2008, ‘A critical review of zoo-based olfactory enrichment’, in ‘Chemical signals in vertebrates 11’. Eds J.L. Hurst, R.J. Beynon, S.C. Roberts, and T.D. Wyatt. Springer: New York, NY.
Grobler, R., 2018, ‘Curiosity killed the … vulture?’ viewed 13 April 2019, from https://www.lionsands.com/2018/09/curiosity-killed-vulture-leopard/#.
IUCN, 2018, ‘The IUCN Red List of Threatened Species’, version 2018-1. www.iucnredlist.org. Downloaded on 10 August 2018.
Kendall, C., Virani, M.Z., Kirui, P., Thomsett, S. & Githiru, M., 2012, ‘Mechanisms of coexistence in vultures: understanding
the patterns of vulture abundance at carcasses in Masai Mara National Reserve, Kenya’, Condor 114, 523–531, DOI: 10.1525/cond.2012.100196.
Kruuk, H. & Turner, M., 1967, ‘Comparative notes on predation by lion, leopard, cheetah and wild dog in the Serengeti
area, East Africa’, Mammalia 31, 1–27.
Mundy, P.J., 1997, ‘Hooded Vulture Necrosyrtes monachus’, in ‘The atlas of southern African birds’. Eds J.A. Harrison,
D.G. Allan, L.G. Underhill, M. Herremans, A.J. Tree, V. Parker, and C.J. Brown. pp. 156–157. BirdLife South Africa: Johannesburg.
Mundy, P.J., Butchart, D., Ledger, J. & Piper, S., 1992, ‘The vultures of Africa’, Academic Press: London, UK.
Murn, C., Combrink, L., Ronaldson, G.S., Thompson, C. & Botha, A., 2013, ‘Population estimates of three vulture species in Kruger National Park, South Africa’, Ostrich 84, 1–9, https://doi.org/10.2989/00306525.2012.757253.
Oaks, J.L., Gilbert, M., Virani, M.Z., Watson, R.T., Meteyer, C.U., Rideout, B.A., Shivaprasad, H.L., Ahmed, S., Chaudry, M.J.I., Arshad, M., Mahmood, S., Ali, A. & Khan, A.A. 2004, ‘Diclofenac residues as the cause of vulture population decline in Pakistan’, Nature 427, 630–633, https://doi.org/10.1038/nature02317.
Ogada, D., Botha, A. & Shaw, P., 2016a, ‘Ivory poachers and poison: drivers of Africa’s declining vulture populations’, Oryx
, 593–596, https://doi.org/10.1017/S0030605315001209
Ogada, D., Shaw, P., Beyers, R.L., Buij, R., Murn, C., Thiollay, J.M., Beale, C.M., Holdo, R.M., Pomeroy, D., Baker, N., Kruger, S.C., Botha, A., Virani, M.Z., Monadjem, A. & Sinclair, A.R.E., 2016b, ‘Another continental vulture crisis: Africa’s vultures collapsing toward extinction’, Conservation Letters 9, 89–97.
Pennycuick, C.J., 1976, ‘Breeding of the Lappet-faced and White-headed vultures (Torgos tracheliotus Forster and
Trigonoceps occipitalis Burchell) on the Serengeti Plains, Tanzania’, African Journal of Ecology 14, 67–84.
Phipps, W.L., Willis, S.G., Wolter, K. & Naidoo, V., 2013, ‘Foraging ranges of immature African White-backed Vultures
(Gyps africanus) and their use of protected areas in southern Africa’, PLoS ONE 8, e52813, https://doi.org/10.1371/
Powell, D.M., 1995, ‘Preliminary evaluation of environmental enrichment techniques for African lions (Panthera leo)’, Animal Welfare 4, 31–370.
Pringle, G., 2016, ‘Kruger leopard with a head for heights’, viewed 13 April 2019, from https://www.wildcard.co.za/kruger-leopard-head-heights/.
Reading, R., Tshimologo, B. & Maude, G., 2017, ‘Coprophagy of African Wild Dog faeces by Hooded Vultures in Botswana’,
Vulture News 72, 34–37.
Reading, R., Bradley, J., Hancock, P., Garbett, R., Selebatso, M. & Maude, G., 2019, ‘Home range size and movement patterns
of Hooded Vultures Necrosyrtes monachus in southern Africa’, Ostrich 90, 73–77, DOI: 10.2989/00306525.2018.1537314.
Sutherland, W.J., Dicks, L.V., Ockendon, N., Petrovan, S.O. & Smith, R.K. (Eds.), 2018, ‘What works in conservation’. OpenBook Publishers.
Taylor, M.R., Peacock, F. & Wanless, R.M., 2015, ‘The 2015 Eskom Red Data Book of birds of South Africa, Lesotho and Swaziland’. BirdLife South Africa: Johannesburg.
Thiollay, J.-M., 2006, ‘Severe decline of large birds in the Northern Sahel of West Africa: A long-term assessment’, Bird Conservation International 16, 353–365.
Thompson, L.J., Davies, J.P., Gudehus, M., Botha, A.J., Bildstein, K.L., Murn, C. & Downs, C.T., 2017, ‘Visitors to nests
of Hooded Vultures Necrosyrtes monachus in north-eastern South Africa’, Ostrich 88, 155–162, http://dx.doi.org/
Virani, M.Z., Kendall, C., Njoroge, P. & Thomsett, S., 2011, ‘Major declines in the abundance of vultures and other scavenging raptors in and around the Masai Mara ecosystem, Kenya’, Biological Conservation 144, 746–752, https://doi.org/10.1016/j.biocon.2010.10.024.