Using mejos kept the Taming% fairly high. Make sure you stay on it with narcotics as its torpor goes down fairly quick. Not recommended to tame if you are not prepared with marcotics or to far from base if you are low. ~KT
Its the most aggressive herbivore, so be careful ! It's a classic knock out and it eats berries or megalosaurus kibble which I really recommend because the tame takes a veeery long time. It also loses torpor quite fast so you're gonna need a lot of narcotics. But once it's tames, you got a real beast: it can mess up against the rex and is a farming machine. Leftclick for wood and thatch, rightcklick for fiber and "c" for berries. It's the first herbivore that harvests bodies: leftclick for meat and hide etc. And "c" for only hide. You can increase the amount of gathered ressources by leveling up, similar to the moschops.
Want a dino that is a super collecting beast of terror capale of destroying rexes and laying waist to entire forests? Look no further! The theri is exactly that it can collect berries with C key, wood with right click, thatch, fiber with left click, and meat with right click!
Make sure you hold it in quetz arms or taming pen because it does a lot of damage, lvl 105 did 135 damage before tamed. Uses not that much torpor but stay alert! Normal KO strategy. Mid-end game tame, usefull early game but hard to tame!