It is not hard to tame a LOW LEVEL therizonossaur. Mounting one of your fast dinos (Galimimo, Raptor, Iguanodon is preferred) and search for therizono, remember to equip a lot of narcoberries if you pretend to tame using mejoberries. when you found the wild therizono just dismount and shoot narcotic arrow against it, mount again and run to gain distance and shoot again. Do this till you take this Dino down. NEVER STAY CLOSE TO IT, cause it will kill you easily, so distance is you friend.

More Therizinosaurus Taming & KO Tips