Reference health
Foraging Ranges of Immature African White-Backed Vultures (Gyps africanus) and Their Use of Protected Areas in Southern Africa
44/44 checkable references clean · checked 2026-07-14
Every reference with a DOI in the deposited reference list resolved to a known work in Crossref or DataCite at the dated check, and none carried a publisher retraction, withdrawal, or removal notice.
16 without a DOI — not checked. A reference deposited without a DOI is never matched by title or guessed at; it stays outside the checked set, and this line discloses that.
The 44 checked references that resolve
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The 16 references without a DOI — listed, not checked
no DOI — not checkedMundy PJ, Butchart D, Ledger JA, Piper SE (1992) The vultures of Africa. London: Academic Press.
no DOI — not checkedIs climate change influencing the decline of Cape and Bearded Vultures in southern Africa?
no DOI — not checkedRecent changes in populations of resident Gyps vultures in India
no DOI — not checkedBirdLife International (2013) Species factsheet: <italic>Gyps africanus</italic>. Available: <ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.birdlife.org" xlink:type="simple">http://www.birdlife.org</ext-link>. Accessed: 07/01/2013.
no DOI — not checkedReport on southern African vulture recoveries
no DOI — not checkedBrown L, Urban EK, Newman K (1982) The Birds of Africa. London: Academic Press.
no DOI — not checkedCapture and fitting of satellite- and radio-telemetry equipment onto Cape Griffon vulture <italic>Gyps coprotheres</italic>, African white-backed vulture <italic>Gyps africanus</italic> and Lappet-faced vulture <italic>Torgos tracheliotos</italic> in the Waterberg area, Namibia in 2004
no DOI — not checkedRodgers AR, Carr AP, Beyer HL, Smith L, Kie JG (2007) Home Range Tools (HRT) for ArcGIS. Version 1.1. Ontario Ministry of Natural Resources, Centre for Northern Forestry Ecosystem Research, Thunder Bay, Ontario, Canada.
no DOI — not checkedSouth AB, Kenward RE, Walls SS (2008) Ranges7: for the analysis of tracking and location data. Online manual. Anatrack Ltd. Wareham, Dorset.
no DOI — not checkedBeyer HL (2009) Hawth's Analysis Tools for ArcGIS version 3.27 (software). Available: <ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.spatialecology.com/htools" xlink:type="simple">http://www.spatialecology.com/htools</ext-link>. Accessed: 07/1/2013.
no DOI — not checkedIUCN, UNEP (2010) The World Database on Protected Areas (WDPA). UNEP-WCMC. Cambridge, UK. Available: <ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.protectedplanet.net" xlink:type="simple">www.protectedplanet.net</ext-link>. Accessed: 07/1/2013.
no DOI — not checkedIUCN, UNEP (2003) United Nations List of Protecetd Areas 2003. UNEP-WCMC. Cambridge, UK. Available: <ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="http://www.unep.org/pdf/un-list-protected-areas.pdf" xlink:type="simple">http://www.unep.org/pdf/un-list-protected-areas.pdf</ext-link>. Accessed: 07/1/2013.
no DOI — not checkedIvlev VS (1961) Experimental ecology of the feeding of fishes. New Haven: Yale University Press.
no DOI — not checkedMundy PJ (1997) Whitebacked vulture <italic>Gyps africanus</italic>. In: Harrison JA, Allan DA, Underhill LG, Herremans M, Tree AJ <etal>et al</etal>.., editors. The atlas of southern African Birds. Johannesburg: BirdLife South Africa. 160–161.
no DOI — not checkedGame ranching in the Northern Province of South Africa
no DOI — not checkedSchultz P (2007) Does bush encroachment impact foraging success of the critically endangered Namibian population of the Cape Vulture <italic>Gyps coprotheres</italic>? MSc thesis, University of Cape Town.
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