A sasquatch has an animal body with a humanoid shape. It can see invisible creatures. It is an omnivore.

The name Sasquatch doesn't really become important in Canada until the 1930s, when it appeared in the works of J. W. Burns, a British Columbian writer who used a great deal of Indian lore in his stories. Burn's Sasquatch was a giant Indian who lived in the wilderness. He was hairy only in the sense that he had long hair on his head, and while this Sasquatch lived a wild and primitive life, he was fully human.

Burns's character proved to be quite popular. There was a Sasquatch Inn near the town of Harrison, British Columbia, and Harrison even had a local celebration called "Sasquatch Days." The celebration which had been dormant for years was revived as part of British Columbia's centennial, and one of the events was to be a Sasquatch hunt. The hunt never took place, perhaps it was never supposed to, but the publicity about it did bring out a number of people who said they had encountered a Sasquatch-- not Burns's giant Indian, but the hairy apelike creature that we have all come to know.
The Encyclopedia of Monsters, by Daniel Cohen