White Rhinoceros or Square-lipped Rhinoceros (Ceratotherium simum), lying on its side, covered in flies, with Red-billed Oxpecker (Buphagus erythrorhynchus) on its back, Kruger National Park, South Africa, Africa

African buffalo (Syncerus caffer), bull feeding on leaves, Red-billed oxpecker (Buphagus erythrorhynchus) on buffalo's face, Kruger National Park, South Africa, Africa

White Rhinoceros or Square-lipped Rhinoceros (Ceratotherium simum), lying down, covered in flies, with two Red-billed Oxpeckers (Buphagus erythrorhynchus) on its back, Kruger National Park, South Africa, Africa

White Rhinoceros or Square-lipped Rhinoceros (Ceratotherium simum), standing in dry grass, covered in flies, with two Red-billed Oxpeckers (Buphagus erythrorhynchus) on its back, Kruger National Park, South Africa, Africa

Red-billed oxpecker (Buphagus erythrorhynchus), eating ticks on the back of a Blue wildebeest (Connochaetes taurinus), Kruger National Park, South Africa, Africa

Three red-billed oxpeckers (Buphagus erythrorhynchus), perched on the back of a greater kudu (tragelaphus strepsiceros), Kruger National Park, South Africa, Africa

Yellow-billed oxpecker (Buphagus africanus) sitting on buffalo, detail, Kruger National Park, South Africa, Africa