It’s ok to be afraid of these guys, if u wanna tame them however, you are gonna have to be a bit brave. Put your tame(s) on passive, grab your weapon of choice + ammo, 16 stone pillars and a large bear trap. Using 7 of your pillars, snap each in place with one spot left empty (For the theriz to enter). Place another 7 on top of your current pillars (so there’s two “layers”) and place the large bear trap somewhere in the middle, comfortably away from the edges of the trap. Now get your theriz. You can snipe it or punch it to agro, whatever is comfortable for you, and run to your trap. Run immediately behind the trap so the theriz runs right into the middle and gets caught in the bear trap (if it loses agro just shoot it and it should run over) . Swiftly move around to the back and place your last two pillars down, one on top of the other, walling the theriz in. Stay away from the trap edges and start tranqing the theriz. Stay calm and keep a slow but steady rate of tranqs. As soon as it’s knocked out, pause the game and take a breather, you have done the hardest part, now, just put in your food and tranqs and monitor it’s progress.

Well what are you waiting for?! Stop reading this and go tame it! You can do it!

Sincerely, a wholesome gamer :)

To random lvl 37:

High ground, mejoberries are among the best, narcs to use are bio toxin (around 250+ or so, depending on the level, to get just kill the jellyfish) crossbow is alright, but tranq dart would be better. Go for the head, check hp always with a spyglass, then let it recover a bit if its health is too low to prevent you from accidentally killing it. Make sure the high ground you’re on is a CLIFF facing big rocks (this thing can walk over rocks so watch out for that also can push trees out of the way, dunno if that is a glitch but whatever). Always have a flyer at the ready, ptera is good. Taming pen is a bit hard because this bastard can damage stone with its beak attack, which can also give you torpor if it hits you. Also equip a shield, just in case. Saved my ass from lvl 130+ theris in case a hunt went wrong. Best armor to use is flak, no more no less if you wanna fight this guy, tho it can melt flak and also pierce straight through that. Pissing it off then climbing to a nearby rock a sarco can climb on spells instant death for you. Killing this as a lvl 37 is impossible without a good sword and shield at the ready. Spino also takes good care of killing this bastard. One mark for a therizinosaur is if there’s too many herbivores in the area that should normally be filled with raptors or terror birds. You’re gonna need a ton of tranq arrows to knock it out though, with a certain chance of death.

-from a mobile player, RedBlade426

If you tame one of these and put spike walls around to protect it while taming beware titanoboa can come right through the spike walls and attack like they are not even there. Also clear the small plants and underbrush away so you can see it coming because they can sneak through the plants and attack your unconscious tame and you won't see it until too late.

For me they are on almost every coast in the south of the main giant island. My tip is to fly. Plus I was able to tame a pteranodon with 20 narcotics plus about two or 4 used. So maybe not so much narcotics with terizino. They aren’t agro unless really close or shooting at them. They fast/slow fast attack kinda slower than at least 400 speed and about 300 stamina fir human or pteranodon