Whisper-like behavior in a non-human primate.

摘要: In humans, whispering has evolved as a counteractive strategy against eavesdropping. Some evidence for whisper-like behavior exists in few other species, but not been reported non-human primates. We discovered the first of primate, cotton-top tamarin (Saguinus oedipus), course investigating their use human-directed mobbing calls. exposed family captive tamarins to supervisor who previously elicited strong response. Simultaneous audio-video recordings documented animals' behavioral and vocal responses supervisor's presence absence. Rather than exhibiting response producing loud calls, exhibited anti-predator behaviors produced low amplitude vocalizations that initially eluded our detection. A post-hoc analysis data was conducted test new hypothesis-the were reducing context exposure potential threat. Consistent with behavior, tamarins' significantly reduced only supervisor. Due its subtle properties, this phenomenon may have detection species. Increasing species suggests such signaling represent convergence communication amongst highly social cooperative