When taming it, use stimberrys because it constantly eats it and it's taming goes up with it. After it has eaten them all put in the berries you have chose. However it does not increase the taming a lot, only a small bit at a time.
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.