I had seen one of these with my pterodactyl and I was trying to level it. My pterodactyl had about 5000 health. I killed one and it got me to about 1250 health. I saw another tried to kill it with a sneak attack. Let’s say well... I had to walk home.
Was in my base refining metal when one of these babies runs by with an impaled tribemate of mine stuck to its back screaming help. I just went on with my business. No one has seen Ricky or his kidnapper since.