A red-billed oxpecker perching on the back of a plains zebra (Equus quagga)

A red-billed oxpecker perching on the back of an impala (Aepyceros melampus)

Plains zebra hind with oxpecker.

Plains zebra with oxpecker.

Plains zebra with red billed oxpeckers that comb the animal for ticks and other parasites.

Plains zebra with red billed oxpeckers that comb the animal for ticks and other parasites.

Two White Rhinoceros grazing

Red-billed oxpecker on the back of a white rhinoceros

Red-billed oxpeckeron black rhinoceros

Rear view of black rhinoceros in open grassland

Portrait of adult bull with red billed oxpeckers looking for parasites on rhino's skin.

Red billed oxpeckers hitch hiking on a rhino's back