White rhinoceros grazing in african savannah with oxpecker on his back

white rhinoceros rhinoceros rhino oxpecker game reserve ceratotherium endangered poaching wildlife south africa big five safari horned horn grazing africa animal mammal herbivore grazer pachyderm hump thick skin mutualism coexistence stumpy piggyback habitat savannah dangerous massive fat beast colossus welgevonden coexist plant eater heavy perching bird