But Cetaceans do have language? And we do have communication to some level. > Experiments have shown that they can learn human sign language and can use whistl

But Cetaceans do have language? And we do have communication to some level. > Experiments have shown that they can learn human sign language and can use whistles for 2-way human–animal communication. Phoenix and Akeakamai, bottlenose dolphins, understood individual words and basic sentences like "touch the frisbee with your tail and then jump over it" (Herman, Richards, & Wolz 1984). Phoenix learned whistles, and Akeakamai learned sign language. Both dolphins understood the significance of the ordering of tasks in a sentence. [0] Maybe this definition of sentience is too broad, but it is worth evaluating what you can hope to achieve, by looking at the closest approximation available and what you are achieving there. And in this case, I would say "not much". We know e.g. dolphins have a language and communicate, we can very coarsely decipher it, and they can learn to broadly decipher a language we engineered for them. But the most we are achieving with this communication are party tricks in a circus. [0] https://en.wikipedia.org/wiki/Cetacean_intelligence https://en.wikipedia.org/wiki/Cetacean_intelligence