OK, I'm going to throw a bone to all you tunnel and cave sliders (yes, I said sliders). There is an 'origin' mythology from some South West (USA) group and it says that they came from caves. They came from caves, they said. And also they have a word (in one of the langs there, maybe Hopi?) that means, in effect, 'place of emmergence'. And the cave is supposed to have been inside The Grand Canyon. Now here is the rest: the word, the Hopi word (maybe it's Navajo? Zuni?) I'm working form memory. That word means 'place of emergence' or 'opening of cave' but it is a synonym for their word for part of a woman's body, the part that we call the vagina.
Could it be that the 'natives' were telling the 'anthropologists' some funky stories to make the antrolpologists look like idiots later?
Where do your people come from
they emerged
from where did they emerge
from a vagina