Came across one of these while looking for an argy, I was no where ready to take on a rex but I saw an opportunity when i saw it was stuck while agro on another creature that was stuck too. I fired tranqs at it and knocked it out and quickly ran back to my base grab some raw prime meat and i ended up taming it. I did have a sabertooth attack it while i was gone but for my first large carnivore tame I still think it was great!!!