The Yetis are a species that live on the planet Neptune and its moon Triton as well as on Earth in the Himalayan mountains located in Asia. They’re large primates who have been hunted in their habitat prior. The Yetis are the outcome of the disease Yetiism, a contagious disease which turns those who fall to it into Yetis.
The Yetis have their own language they use to communicate amongst themselves. Some members of other species have been able to learn it. This language sounds like growling to outsiders.