Bigfoot is a familiar word today around the world. Since the middle of the last century it indicates a mysterious giant primate of North America, who is also called Sasquatch. The Russian vision is presented within this book. Bigfoot is a familiar word today around the world. Since the middle of the last century it indicates a mysterious giant primate of North America, who is also called Sasquatch. The Russian vision of this research is distinguished by at least three peculiarities: it is based on the combined evidence regarding these primates; it regards these humanlike beings as relict hominids (hominins by latest primate classification), i.e., the closest relatives of modern man, Homo sapiens; and it firmly takes the existence of these still enigmatic bipeds for a biological fact, not a popular myth or a scientific hypothesis. The purpose of the book is to substantiate these views and claims. The main philosophic question posed by it: What is it to be human?