Cotton-top tamarins
whisper to each other.
To
better understand how the tiny monkeys use mobbing calls, the
researchers recorded sounds a group made when a known threat entered the
vicinity—a supervisor that had been part of the team that had captured
them in the wild. Prior to the study, the monkeys had used mob calls
whenever the supervisor came into their view. Neither of the researchers
noticed anything unusual as recordings were made, but later during
playback analysis they discovered the monkeys were engaging in
vocalizations that were at such low amplitude that people in the area
couldn't hear them—they were whispering to one another.
How do ya like them apples?
