A Monkey can make a variety of sounds, including barks, screams, chattering, screeching, and other loud hollers. They have been known to mimic human voices in some instances.
Monkeys can also use a combination of vocalizations, such as shaking their head or slapping their body to make certain sounds. Altogether, these vocalizations form their own unique language which can be used to communicate emotions, establish dominance, and even to frighten away predators.