TONY CAMACHO / SCIENCE PHOTO LIBRARY TONY CAMACHO / SCIENCE PHOTO LIBRARY
Human and bonobo ape (Pan paniscus) hands touching. All primates have five digits on each limb (pentadactyly). An opposable thumb is also a characteristic of primates. Photographed at the Lola ya Bonobo (Bonobo Paradise) Sanctuary, Democratic Republic of Congo.
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