Do a search for "mantis" and you will see that a LOT of people around here have seen these guys on their trips. A few of them have seen the Greys too, the "traditional" alien (do a google search for that instead).

Having seen a UFO myself when I was 17, I believe the people who say that these entities are doing abductions. However, while for years I thought that these abductions were all physical, now I have changed my opinion on that, particularly based on the too-many reports of Greys and particularly Praying Mantis encounters while under a psychedelic influence.

What that tells me is that some abductions are physical, but the majority are probably done in the so-called "astral" world. Hence the very little physical evidence of abductions (no photos etc). Which would make these beings "multi-dimensional" aliens, and not necessarily "extra-terrestrial" aliens.