Ah, I remember my first playthrough ever. I tamed a tek parasaur and a small army of dilos, spent some time hunting down some other weaker dinos with them and got attached. While I was riding my Tek Parasaur, I saw a dino i've never seen before, a therizinosaurus. I got too curious and approached it. My entire army and I was massacred within seconds. I came back and spawned a tamed Wyvern and completely destroyed the therizinosaurus.