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Verissimo, D.; Cugnière, J.-C.; Cugnière, S.; Cugnière, J.; Cugnière, G.; Cugnière, L. Record Number of Yellow-Billed Oxpeckers Buphagus Africanus Linnaeus, 1766 (Aves: Passeriformes: Buphagidae) Foraging on a Single Host. J. Threat. Taxa 2017, 9, 9768-9770.