 What are two examples of Groacian communication mechanisms?
You don't have to be crazy to be an earth diplomat—but on Groac it sure helps! "You've been here on Groac for four years, Miss Meuhl. "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.
 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