Communication and Perception
The proboscis monkey has several sounds for communication. Growls are made by males and are used to calm the group members. Honks are made by males as a threat or to warn of predators. Shrieks are made by females and both sexes of juveniles to show aggitation or excitement, and screams are given during agonistic encounters. Social grooming is performed, usually between females. The grooming usually last 1 to 5 minutes and is performed by both individuals.
Communication Channels: visual ; tactile ; acoustic
Perception Channels: visual ; acoustic
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