PETER CHADWICK / SCIENCE PHOTO LIBRARY PETER CHADWICK / SCIENCE PHOTO LIBRARY
Vervet monkeys (Cercopithecus aethiops) grooming. The alpha male (right) is being groomed by a subordinate member of the troop. This primate lives in savannah and scrubland in most of Africa south of the Sahara, by forest edges and running water. Photographed in Kruger National Park, South Africa.
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