For all of you that think a spino is better than a Rex, I agree with you strategy wise but I think the only reason that most people fall for a Rex is because they take less time to incubate as eggs and they are easier to mutate. Also the breeding and mutation cycles take less time than spino do. So as the spino has more of a fighting chance, a lot of them will be needed to fight a boss. Plus they are somewhat rarer than rexes. The Rex is a classic beast of a tame. Convince me otherwise -mexark92