okay so if you want to kill that thing on your own, and you have at least lvl 13 then you might have a chance. i have two ways, one with and one without a pteranodon (or any other flying thing). without ptera: build two spike walls in a V shape. make sure there is a small gap between those so you can run through. make sure the therizino is not too far away and hit it with a bow. it should chase you. now just run through the little gap, the therizino should get cought up and “fight” the spike walls (he'll die after a while). with a ptera you can just attack him from the air and lure him to the spikes. stay in the air or fly further away, he'll die after a while. i've killed about 15 therizinos now with that and i'm still using it with lvl 54 ^^” they're just too scary

Once you have a gun and flier, these become pretty easy to kill. Find a cliff above them or a tall rock and land with flier, then just shoot them in the head. I've killed many doing this. You have to be careful that you are up high enough so that you can't be hit, and be sure when dismounting you don't walk off the edge. If your flier isn't on follow it could result in your death

Honestly I found that the best way to tame it at low level (30 to 50ish) was to get a trike with decent health and tame a turtle. Send the turtle after it and why it is busy Annihilating the turtle pump it full of tranq darts and if it finishes off the turtle first then you have your trike to eat some damage and then you should have enough time to ko it. It's worked for me in my early days I hope it does for you. It's a powerful early game mount so good luck!

Did the knock out and starve with Stimberrys technique and then knocked it out again and fed it Citronal. I got about 94% taming effectiveness, but it took about 3 hrs and 30 mins and about 400 narcotics. Starting level:95 After tamming: level 140. Oh and I used the tranq darts for the second knock out.

They are just almost as strong as rexes, faster in the wild and just like its nemesis, capable of aggroing on almost anything tamed.

The one and only thing that makes this creature so deadly is how weak it looks at first; If you can't fight rexes, you probably can't fight them either. Make your choices wisely.

Best way to tame for lower level survivors. Create three large bear traps and place them down in a line about a parasaurs length from each other. Begin shooting with a cross bow and lure into trap. Make sure to line up the traps between you and it. As one breaks the next will catch it!