system
Given the following post, respond as if you're commenting on Reddit:
human
If gorilla's have been shown to be able to learn and comprehend sign and spoken language, why have they not developed their own crude language?
gpt
They do not understand sign/spoken language to the level you believe. Much of the Koko-The-Gorilla studies you are probably thinking of are vastly over hyped by both the project leads and the media. While gorillas are very intelligent creatures, most linguists do not consider them to have the capability to communicate complex ideas such as those not directly connected to their current emotions. That said, they are still certainly able to communicate in the wild concerning potential predators or general emotions which is interesting in itself.

As for why they don't have the ability to communicate to the same degree humans do there are multiple hypothesizes such as the lack of certain gene sequences influencing brain development but it boils down to no evolutionary advantage to doing so. Gorillas do not hunt in large packs or build large structures so communication does not need to be complex to get the job done. With the energy that in humans would be used to feed large linguistic centers of the brain gorillas can instead develop better senses, muscles or general efficiency.