Kowal gives many humanly characteristics to sly he even addresses it when he states "to smart to be with the other chimps", which is indicating that he's different than the other chimps (Kowal 3).Sly was able to communicate with the humans in the book when he was talking to Vern and when he writes the message to the kids on his window. Sly was also able to control his anger when Vern came to take away his clay because of his behavior he knows that he can hurt Vern, but he doesn't he stays in control of his emotions and talked them out to Vern.
