If you're low/mid leveled, avoid these as much as you can. Its easy for a beginner to see this and think its far too big to be fast, but once they're aggressive, they can easily outrun the player. And standing on their hind legs lets them reach further, so you can't just hide on a rock. If you have no choice but to provoke one of these, my advice is to find the nearest pack of herbivores, which will still the spino, buying you time to find higher ground. Again, for a low level player, escaping is much more feasible than killing.