Hello, this a Jedi. Me and my sister tamed one of these just now, and this is how we did it. 1. If you have and to find one of these, to scouting on a pteranadon. DO NOT ENGAGE, I REPEAT, SO NOT ENGAGE. 2. Go back to your base and make lots of tranque arrows and narcotics. 3. Go back to it with your pteranadon, and to to the spino. Park slightly far away from it. 3. BRING A FREIND. Me and my sister did this on single player. I don't think either of us could have taken it by ourselves. 4. Wait for it to attack something, like a parasaur. Then have your freind on the other side and load it with tranques. It will run fast and in the water so have a crossbow. Feed it meat and enjoy your monstrous freind! We named ours Titan. I'll post stories once he's seen action.