(4) An additional Earth civilization....and we are _not_ the top of the pecking order....
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Likely a deep sea or aquatic civilization, but very advanced and likely recognizable only as vaguely humanoid.
I think we are talking about “angels” and “demons” and the Irish “fairies” and “leprechauns” and other strange “beings” who appear here and there to all cultures throughout history and in myths and legends.
Like ants looking at humans, we are not really processing what we are looking at....so we build models to explain it but they are all just models to make us think we sorta understand it...
This is a really cool series of books showing the wide variety of stuff we are dealing with:
https://www.amazon.com/Humanoid-Encounters-AD-1899-Others-amongst/dp/1542722055