It is a common misconception that SAs are non-verbal communicators. Though they appear to be silent to most living animals, many species of SAs are in fact quite talkative.
Just as a dog whistle cannot be heard by humans, SA speech exists on a frequency that is inaudible to many live animals. SA languages are as varied and diverse as human ones. In fact, SA stuffing materials function in ways quite like human vocal cords. SAs with similar stuffing tend to communicate using similar frequencies and dialects.
Thus, the diversity of communication styles makes inter-species communication difficult. That is why I became a translator. Dolphins are known for their excellent language skills, and I’ve always been a natural. I am the Chief Translator at M.U.M.B.L.E.S. (The Ministry for Undetectable, Mute, Bilingual, and Linguistitch Expression in SAs).