To outsiders, this language usually sounded like mere animalistic barks, roars, growls, and moans, conveying little more than emotion. However, Shyriiwook was in fact just as much an intelligent language as Basic. It was also incredibly difficult, if not impossible, for most Wookiees to learn to speak Basic. As a result, most inter-species communication involving Wookiees had to be carried out in a bilingual format, usually with the Wookiee speaking Shyriiwook and the other party speaking Basic.