So if bigfoot exists, it's a realistic possibility that there is only one, and it is an eternal being that walks the earth?

If you do accept it as a realistic possibility, OK. If the people I debated this subject with, whom I was giving scientific evidence to, read these comments, they'd be falling out of their chairs laughing. It's a little frustrating. But I'm happy to leave off discussing this, it's O/T in this forum.