Killed a few with my pterodon. Gotten extremely lucky a couple other times when they had me KO'd and other animals around me got triggered and took them out while they were eating me alive. Don't go anywhere near the ground when these things are around. If you are on the ground and you see one up close it's already too late. All you can do is watch it slowly kill you and hope for a glitch or another dino to come by and kill it before it kills you.
At lvl 72 with flak armor on, a lvl 5 Troodon knocked me out with one attack at night. Last thing I saw was those glowing eyes before passing out. My Guess is that they attack vital organs. Luckily my Doedicarus was up for a game of baseball and launched that little devil out into the stands.