 What are two examples of Groacian communication mechanisms?
"The Groaci are a very sensitive race. "The impossibility of access to outworlders. An elaborate one picked out in pinkish paint seemed to indicate the Groacian equivalent of a bar. A Groacian bartender was dispensing clay pots of alcoholic drink from the bar-pit at the center of the room. Retief backed, rounded a corner into a narrow alley-like passage, deserted, silent ... except for the following Groacian. Groacian gentlemen." Two Groaci wearing heavy eye-shields and elaborate crest ornaments indicative of rank rose as Retief entered the room. I understand that a Terrestrial task force stood off Groac and sent a delegation down to ask questions. After being securely caged, they were exhibited to the gentle Groaci public.
 Mandible snaps and throat-bladder bleats
 Mandible snaps and throat-bladder bleats  Mandible wiggles and eye clogs  Jaw snaps and jugular cracks  Jowl clacks and eye beats