Where does bigfoot come from?

There are legends about such of a animal or being all over the world. In some parts it is called theAbdominal Snowman or Big Foot. These legends go back centuries, but no one has ever found a dead one or captured one. In hundreds of years there should have been at least some part of one of these found bones, hair, teeth, something to prove the existence of it. Where these started no one knows, but they are passed down century after century. Sometimes I think things like this and other "beings" are used to explain what people don't understand.