TONY CAMACHO / SCIENCE PHOTO LIBRARY TONY CAMACHO / SCIENCE PHOTO LIBRARY
A Red-billed Ox-pecker (buphagus erythrorhynchus) sitting on the face of a warthog (Phacochoerus africanus or Phacochoerus aethiopicus). The red-billed ox-pecker and the warthog have a symbiotic relationship. The bird gains food by eating ticks from the warthog's skin, while the warthog gets cleaned of parasites. Photographed in Zimanga private game reserve, Kwa-Zulu Natal, South Africa.
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