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Yellow Stone Park, Wyoming (United States)

Sighted on Friday 17. May 2019
Reported on
Shape: Square, Rectangular | Duration: 00:00:20

I was idly watching the old faithful web cam when i saw, traveling right to left, what i assumed to be a helicopter shadow, except as it continued i could see it against the sky. my guess it was a cloaked craft, or other semi transparent entity.

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