What Sounds do Koalas Make? Mystery of Animal's Voice Communication Organ

Koalas are solitary animals that generally live in their own, highly defended home ranges. Although koalas' home ranges may overlap, these animals try to avoid confrontations and interactions if possible. Koalas are known to communicate with potential intruders with the help of loud vocalizations. Males are generally more vocal than females, but females will communicate vocally with their young. Both sexes make a variety of noises when in distress. During the mating season, male koalas attract females by making very loud or low-pitched sounds called bellows. Bellows usually reach the frequency of 27 Hz, which is an incredibly low sound for such a small animal. Not only do koala bellows leave many zoo visitors surprised, but they also seem like a mystery. It's the kind of pitch scientists would expect from an elephant, but not a tiny koala. There is a theory claiming that koalas have a special organ in their throats that allows them to make rumbling bellows. Such organs hadn't been seen before and no other mammal has evolved anything similar.