Seatco

Seatco, also known as Tsiatko, is a hairy hominid reported to inhabit the Rocky Mountains of the United States of America. They are stated to be an uncivilized lot which apparently take advantage of ways to make their own lives easier, collecting wood (likely through thievery), as well as stealing fish from local humans and their children as well to use as a form of slave labor—because of this latter strategy, locals are said to warn their children not to stray too far into the surrounding wilderness for fear of losing them forever. Their language consists of whistling, which they can somehow enchant humans with. Like Sasquatches they live in close familial units and will remember those who kill one of their own kind, eventually taking their revenge on the individual(s) responsible. While they will venture out to hunt they are seemingly at least semi-sapient, as they will never cross water, perhaps due to some form of superstition.

One report details how a Native American boy once told a story from his grandfather in the mid 19th century. According to the boy's grandfather, a group of Native Americans captured a Seatco boy: They witnessed how this boy was nocturnal and captured fish, hunted deer and collected wood for fire, the Seatco eventually came to retrieve their boy. Their whistling scared the Native American people away, leaving the boy unattended. The boy then reunited with his family and the Seatco were not seen by these Native Americans again.