Communication occurs both though vocalization and by visual gestures.[1] Vocalizations that have been recorded include whistles, twitters, trills, loud or soft sharp notes, sneezes and long rasps.[2] Body postures and displays that reveal more of the white coloration, such as standing on hind legs and piloerection, tend to be associated with aggression.[12] Females often signal willingness to mate by rapidly coiling their tails.[12]