An impala appears to be listening to two oxpeckers as it browses on August 20, 2016 in the Kruger National Park, South Africa. Oxpeckers have a mutually beneficial relationship with most of the large mammals in the park by eating parasites from their skins, but a lesser known fact is that they also eat earwax to aid in the bird’s digestion. (Photo by Greatstock/Barcroft Images)
