Explanation for the many cases of precision cattle mutilations was one given as “The extraterrestrials are compiling a dna library.” (Unless like crop circles these are based on hoaxes). Also why some who claim to have been abducted show surgical scars. (Unless they are lying about it all). Ancient Aliens “Project Hybrid” in 2019.
It would explain some really odd looking creepy people around, though.
Fascinating story excerpt:
https://www.facebook.com/ancientaliens/videos/human-alien-hybrids-live-among-us/1674062426370760/