The howler monkey is the loudest land animal in the world. It is also one of the largest apes in South America. Its impressive screams with low tones can be heard over 5 kilometers away! Thanks to these screams, the monkeys can communicate with each other, indicate their position, and warn of danger. These screams also have a species-preserving function: they defend their territory by screaming and thus signal the presence of a group. Moreover, the species is not threatened with extinction.