Best way to tame for lower level survivors. Create three large bear traps and place them down in a line about a parasaurs length from each other. Begin shooting with a cross bow and lure into trap. Make sure to line up the traps between you and it. As one breaks the next will catch it!
If you want to knock it out effortlessly, place a wooden cage and lead it towards the cage. It will start attacking the cage. You can shoot it with tranq arrow and BOOM! You have made it unconscious. Also, it eats berries.