Chimpanzees, top right: Corbis / ​ Punchstock / ​ Getty Images; lower left and right: SuperStock RF / ​ SuperStock; Jane Goodall: © Martin Engelmann / ​ age fotostock
Shimpanzetë, sipër djathtas: Corbis / ​ Punchstock / ​ Getty Images; poshtë majtas dhe djathtas: SuperStock RF / ​ SuperStock; Xhejn Gudolli: © Martin Engelmann / ​ age fotostock