This haunts me. Gorillas and chimps are crazy smart and can be taught sign language, so why can’t they speak? They have human-like mouths and they’re obviously vocal, so why don’t they at least have the vocabulary of a toddler?
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Long story short it appears that they don’t have the ability to ask questions.
Asking questions gives rise to a conversation and the ability to build a language.
At this point only humans and one parent have ever asked a question.
There are multiple other examples why they would happen in ability to have what would be considered conversations.
On the side note dolphins have full conversations with each other and actually make extended plans and create games between themselves.
So this probably isn’t a completely accurate answer but it almost certainly has something to do with it.
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