Help

Okay, so I've been struggling to find this species for hours online. I saw an image months ago and just remembered it. It was black and white and had almost flag/sail like appendages, may have been its wings that were waving while it flew ik thats not a lot to go off but :(((

submitted by /u/solemnolive
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source https://www.reddit.com/r/Entomology/comments/kgql5e/help/