Red-billed oxpecker (Buphagus erythrorynchus) on white rhino (Ceratotherium simum), Zimanga game reserve, South Africa

white rhinoceros rhino rhinoceros african wildlife wildlife mammal resting sleeping bird horn grassland savanna africa nature animal endangered species conservation wild close up portrait animal behavior outdoor daytime environment habitat safari tourism travel south africa snout eye ear leg foot toes claws skin texture color brown