Charles Hockett was disappointed because he couldn’t find the main distinguishing characteristics between animal communication systems and human language. However, at the end he seemed to have found a solution and he wanted to share it with Tarzan.Contact me: on Facebook: https://www.facebook.com/Glotters/ https://www.facebook.com/groups/glotters/ on Twitter: https://twitter.com/Glotters?lang=it on Linkedin: https://www.linkedin.com/groups/8663314 My blog: http://kolay-turkce.blogspot.it/