... Koko reportedly communicated via American Sign Language her hopes for freedom, and to have a baby, over the internet, (www.koko.org). A chimpanzee called Kanzi has also been reported to understand a version of symbolic sign language developed by her trainer Sue Savage-Rumbah, and can in fact carry out actions such as picking up a straw, or carrying rubbish to another trainer when ... a theory of mind. ( Baron-Cohen, Leslie & Frith, 1985, cited in Eyesenk & Flanagan, 2001). Hauser, (1998, cited in Eyesenk & Flanagan, 2001), devised his own version of the Sally-Anne test, suitable for use...

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• Grade Level: Graduate