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And in the case of the Navajo, that's what the Yébiché represent.

In the case of the Hopis, the K'ich'in represent those gods that came to Earth to give them knowledge.

And could one make the argument that these may have been visitations by flesh and blood exo-telestials in ancient times?

Oh definitely. From what we understand, there's many different races of alien that are coming to this world.

In the case of some tribes, some of the Serbians, you know the mountain range called the Estrella Mountains.