system
Given the following post, respond as if you're commenting on Reddit:
human
How well is cetacean "language" understood, or, how complex is dolphin/whale language?
gpt
very little is understood. 

We know that they have signature whistles (names) they use to identify each other. Their signature whistle is similar to their mother. They have dialects. They can learn human sign language, both individual words and sentences. They also understand the difference in ordering of words. It seems that they have the capacity for using simple language, at least.