Assertion: lemur's call | /r/HasProperty | abrupt roars
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text: Other calls of this time are "abrupt roars" which might function to alert group members to avian predators, to communicate between group members out of visual contact and also probably to communicate a more general aggressive/defensive response to a disturbance, and "pulsed squawks" which primarily alerts group members to mammalian predators, shows high arousal and is a signal for the group to quickly aggregate (Pereira et al. 1988; Macedonia 1990; Morland 1991a).