 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! I've been tied up every off-duty hour since I got here—" "You can't offend the Groaci," Miss Meuhl said sharply. "You've been here on Groac for four years, Miss Meuhl. "The Groaci are a very sensitive race. "The impossibility of access to outworlders. The few Groacians on the street eyed him furtively, veered to avoid him as he passed. 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. A tall Groacian vibrated his mandibles in a gesture of contempt. Retief backed into the opening to a narrow crossway and offered further verbal familiarities to the drunken local, who followed, furious. 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. "One hour ago," The Groacian said, "a Groacian national was brought to hospital suffering from serious contusions. I understand that a Terrestrial task force stood off Groac and sent a delegation down to ask questions.
 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