red-billed oxpecker african bird on female impala at serengeti national park in tanzania, africa

africa african antelope beneficial benefit between billed bird buphagidae cattle different east eating feeding fur hair hitch impala infested insect interaction livestock living mammal national native nest oxpecker parasite park passerine pecking perch perching pick plucked plucking pulling red relationship savannah serengeti skin symbiotic tanzania tick tickbird