You can easy just stand on a cliff while they fail to climb up. They don't drown when you knock them out in water. Another alternative and !y favorite is standing on a paracer, bronto, or diplodocus and shooting it from there.
I see all these comments on how to tame it lol. Easy. Shoot it in the face while walking backwards job done. None of this tame pen rubbish or hugging its legs. If you get one in the swamp your gonna want to lure it out of the swamp though