The beings known as Bigfoot, Yeti and Sasquatch are real, but are trans-dimensional entities, sometimes called tulpas. They aren’t a soul-based species or an actual race of beings. Their development comes from the consciousness invested in them from humans in 3-D. They began without physical form as thought-form entities in astral. They have a small amount of consciousness that feeds off fear or other emotions.
Over hundreds of years in 4-D, they have been able to manifest after gaining energy from the same type of people, when there’s fear or attention given to their existence. This causes them to become stronger and more independent.
Just as thoughts become real, they were able to push through the densities of 4-D into the physical world, and are able to travel back and forth. They are harmless because they lack intellect but they could attack someone if they wanted to. They are still more timid while in physical form. They go to remote places and often just vanish as they lose density (vibrational frequency) that would hold them in form.
The explanation of their existence as fear-based thought forms explains why there are so many fearful encounters and attacks associated with them, and why no physical evidence can be found.