Never ever let your carno loose on a parasaur when these guys are in the area!! These guys can throw mud/poop (can't really tell when it is covering my face) but if you tame them they can throw boulders.
I just went up to one of these things to admire it, then it punched me. I ran away, then looked back for a sec. Do you know what it did? It scooped a massive lump of crap from the ground and chucked it at me, and then the game said I was poisoned. WHAAAAAAAAT??!!!