Humans. The “aliens” do not like to leave overt signs of meddling.

The glyphs of Peru had more to do with the off worlders. Such are how tribesmen “represented” their local identities to the sky peoples.

In ancient times, the Greys did in fact visit primitive tribes peoples. They introduced themselves, chatted for a bit.

The Hopi and other end of the world myths were instigated by these conversations. Without their intervention the world was to be consumed by nuclear fires before 2012.

https://pastebin.com/42dTemNe