This is purely anecdotal, but I once saw a UFO that didn't seem to move like a plane. It was a good distance away so I couldn't see much of the craft's detail. I wanted some sort of proof that it was intelligent, so I said 'Prove yourself' to the craft, and it proceeded to do a blunt 90 degree right angle turn at high speed (without slowing down). It was as if the craft operators knew they were spotted and wanted to say 'hello' in this peculiar way by doing an impossible maneuver.

If these are hyper-intelligent beings, I would imagine they made some sort of digital clone of themselves so they could explore space without carrying around a biological body through space which would die faster than a digital clone. With a robotic digital self you could live for millions of years exploring, and then when ready, bring lots of data back home from your travels and recon of other planets.