Lauren Ridloff explains about how chimps blossom through sign language vs. voice. It shows that people involved with the usage of sign language to make it accessible and possible for chimps have a better understanding of their needs and are sensitive. I would like to see more people with a similiar attitude towards deaf dogs and cats or any other deaf animals that rely on sign language and visual cues as they need it.
Here's Lauren's wonderful vlog:
Chimps and Sign Language