Avoid Carnotaurus until you have flak armor. They are faster than you and trap you in their arms. If you run into them you will certainly die if not prepared. If you have no other choice try to find a large rock/cliff to shoot arrows from. They have lower health than a triceratops or turtle. If everything else fails use a boat or get them in deeper water and pike their feet.
Because I’m an idiot, I forced my tribemate to help me kill an Alpha Rex I found. Well, that wasn’t a great idea. We landed on a cliff overlooking the Alpha and its turmoil, and began shooting with our crossbows. I HEAR STOMPING, OKAY, AND I TURN TO RUN TO MY PTERANODON BECAUSE I RECOGNIZE THE FOOT PATTERN—A Carnotaurus knocks us both off of the cliff and down where the Alpha is and I think you know what happened next..