Language is very much cultural, the instinct to communicate and decipher others utterances is what is inate. Otherwise one could automatically understand other

Language is very much cultural, the instinct to communicate and decipher others utterances is what is inate. Otherwise one could automatically understand other languages without learning them. Dolphins and whales are already communicating currently. But it's possible that what we are seeing now is a much simpler version of what existed previously, not to mention that we don't have any clue how to decipher what we are hearing now.