Non-humans do have a language, even if it is not what is expected by the definition of language. Many non-humans use body language and noise. I believe that this language does not convey actual words, but more of feelings. Some curve their bodies away from others, giving off the feeling I'm small, I'm not worth your time. It's not like a foreign language like Spanish were hola=hello, it's not a direct translation. You have to interpret the words. This is my belief. To note, if two dolphins are communicating in a pod and they are greeting each other do you think they are actually saying, "Hey, what's up? I missed you." or conveying the feelings of happiness, love, and curiosity. In no way am I implying that non-humans are stupid, I'm simply saying that non-humans definitely have a language, it is just different from ours.