Red-billed Oxpecker Birds On The Back Of Walking Hippo In Aberdare, Kenya

bird oxpecker back hippo hippopotamus redbilled walking animal wild back view aberdare kenya closeup redbilled oxpecker behaviour buphagus erythrorynchus passerine rear close up red billed oxpecker behind native giant behavior conservation mutualism semiaquatic vulnerable safari mutualistic large perched symbiosis buphagus erythrorhynchus african fauna nature africa habitat herbivore amphibius hippopotamidae wildlife park natural mammal environment