They're so annoying to deal with. Those things will rip through your flesh so quickly and never seem to have the will to be tamed as I found that out of the 50 I tried knocking out(Primitive Longneck) for an "experiment", 34 died.
They are also aggressive so... Yeah.
I found that the best way to kill one is to have them trapped in bollards or spikes and have X plants shooting them. DO NOT get in melee range unless with a rex, spino, giga, or another therizino. Most of the dinos I listed(all but giga) should have relatively similar levels or you risk losing them. I also seem to find an infestation of them wherever I go.
If you find this thing RUN it took me out in two hits and completely demolished my home and murdered my raptor and my little otter cuddles please like to pay respects to my little cuddles kept me warm on the cold nights