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Abstract Possum acoustic behaviour is complex and varies substantially, with some species having numerous calls used in various contexts, while other species are limited to one known vocalisation or non-vocal sounds. Here, we report that the first known recording of Sulawesi bear cuscus (Ailurops ursinus, 1824) acoustic behaviour and observations of associated behavioural displays. We observed an animal adopting a raised posture in apparent threat display and audio-recorded the concurrent short...