All extant species of hominid: Top) Human, Middle) Common chimpanzee, bonobo, western gorilla & eastern gorilla, Bottom) Bornean, Sumatran & Tapanuli orangutan
Vera & Jean-Christophe, Chandres, William H. Calvin, Clément Bardot, Azurfrog, Eric Kilby, Aiwok, Tim Laman [GFDL], via Wikimedia Commons
