[macintux]

I’m not weighing in on the debate, but there does seem to be a great deal of doubt that Koko was using language in an intelligent way.

[eimrine]

Even when she reported about her toothache? If this situation was not fabricated (why to fabricate a work of your life and how to do it unnoticed) the situation meets the definition of intelligence.

What are your doubts, are they related on some data?

[macintux]

https://en.wikipedia.org/wiki/Koko_(gorilla)#Criticism

“Great deal” may be overstated.