Before you try to tame one of these beasts know that you will need A LOT of narcotics, I'm not joking when I say bring over a thousand of them. You should also know that they require constant care for the time they will be knocked out. If you try to tame with berries (which I did) expect to loose around three hours of your day. Their torpor is drained EXETIMELY FAST it takes from 10-15min to go from full to empty so be ready to give it your full attention. The only way to knock them out without a trap (which I did) is to get them stuck between trees or a Clift. I used my own unfinished base and let just say I need another fabi. Bring around 50 tranq arrows and a full Crossy, I didn't and had to finish knocking him out with a slingshot. And be really careful, good luck.