There have also been suggestions of the ape’s ability to understand vocalisations. In one instance, Dr. Savage-Rambough placed Kanzi in a room and gave him some yogurt. She then observed as Kanzi made a series of vocalisations to Panbanisha in the other room. Panbanisha, who couldn’t see the yogurt Kanzi had, then pressed the button for “yogurt” on the lexigram, suggesting they could understand vocal sounds.