I feel like that wouldn't fit with humanity's ego-centric notion that we are special somehow, and spoken language is one of those things that qualifies us as "s

I feel like that wouldn't fit with humanity's ego-centric notion that we are special somehow, and spoken language is one of those things that qualifies us as "special". We've had some results teaching gorillas and chimpanzees sign language: http://www.koko.org/sign-language http://www.koko.org/sign-language. That hasn't changed much either. I think it would be neat though!