If you are going to tame one of these with no dinos, be sure to upgrade your movement speed and get tranqs. When you see it whip its tail forwards move to the right you will dodge the shots. This worked for me.
To knock out this creature you can use a flying creature to reach a tall stone or hill that it won't be able to climb then shot it with your tranqs, if and when it suits spikes at you move back slightly to dodge them. Good luck.
Put a floor on ur paracer with walls and a celling then put gate at back with ramps leading dwn stick 3 or 4 of these on back of paracer to carry say 4x 500 in carryweight of wood but a paracer can hold say 1500 only 1000-1200 will be used depending on the weight of thornys
You can knock out low levels with something as simple as the boomerang. Just try not to get hit by too many quills. One or two per barrage shouldn't be too bad. Anything beyond that could be certain death