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Discovery of Whisper-like Behavior in a Non-human Primate

In humans, whispering has evolved as a counteractive strategy against eavesdropping. Rachel Morrison, a doctoral student at The Graduate Center and Diana Reiss, a psychology professor at Hunter discovered the first evidence for whisper-like behavior in Cotton-top tamarin monkeys at the Central Park Zoo. The monkeys reduced the loudness of their calls to nearly inaudible levels when a potential threat, a supervisor associated with their medical care, entered their enclosure. This whisper-like behavior may represent a convergence in a communication strategy.

http://news.sciencemag.org/plants-animals/2013/09/scienceshot-shhh-someone-might-hear-us

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