As I've said before, gresat apes may be capable of learning human language at a fairly simple level, but they've never come up with a complex language of their own. Neither have they ever made so much as a simple flint axe, as far as I'm aware, despite the human example being available for millennia. I remember reading that, while gorillas are capable of using rocks to bask things with, when a fragment has broken off that happens to have a naturally sharp edge, it never occurs to them to use it for cutting, much less to try to create a sharp cutting tool deliberately. Therefore, there is still quite a gulf between us and other animals, even our nearest kin.
