a red-billed oxpecker, buphagus erythrorhynchus, sits comfortably on the back of a large mammal in south africa

african savanna wildlife buphagus erythrorhynchus animal beneficial biodiversity bird birdwatching chirping coexistence communication connection cooperation countryside cow dotted ecosystem farm fauna observation feather feeding grassland grazing harmony herbivore horned landscape large mammal nature parasite control partnership perched red billed oxpecker rural south africa spotted pattern symbiosis symbiotic relationship tick removal unique behavior veterinary care wilderness winged