So much misinformation here. Where to begin lol ok so as of Aug 2023, you can knock out w tranq arrows no problem, just go for level 80+ shoot in the head not the shell, wait 5 seconds between shots. You can’t bola them so ignore that comment. Creatures do not take torpor damage when they are caught by bear traps so ignore that comment too. Someone said to use biotoxin to keep them unconscious that’s a terrible plan because these guys wake up pretty fast, and they take quite awhile to tame high levels. You want to use narcoberries because they take the longest to take effect, the time it takes to fill up all the way is invaluable compared to filling it up fast.
I see tons of these walking bowling balls all over aberration, and a lot of them are in the fertile lake area. If you see one, start shooting it in the head with tranq darts. Arrows do more damage but if you don’t have access to darts yet, you can use them. If you do end up using the arrows, wait 5 seconds before every shot to do max torpor with minimum damage. Once tamed these things can roll like a ball, gather stone like BONKERS, and have decent defense. Although, I still wouldn’t recommend attacking a rex with it. Overall, it is a good tame for early game stone gathering.