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McElligott, A.G.;Maggini, I.;Hunziker, L.;Konig, B.«Interactions between red-billed oxpeckers and black rhinos in captivity».Zoo Biology,23,4,2004,p.347–354. DOI: 10.1002/zoo.20013.
Mikula, P.;Hadrava, J.;Albrecht, T.;Tryjanowski, P.«Large-scale assessment of commensalistic–mutualistic associations between African birds and herbivorous mammals using internet photos».PeerJ,6:e4520,2018,p.e4520. DOI: 10.7717/peerj.4520. PMC: 5863707. PMID: 29576981.