Yes, that is true. I assume we have a translated version of their vocalizations... Though they seem to be significantly more abstract, when taken from an organism that is non-sapient.

... That being said, non-sapient or otherwise, it is still a barbaric arrangement. [Robert shakes his head slowly.] But one that is... not surprising, considering the Malnosso. After all, what is this enclosure but essentially the same idea?