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.
I'am the guy who made a tip that I hate them that because they killed my 140 pterandon they raided my base and almost killed me but my sarco and turtle and my pack of high level dilos and my para and pachy killed him don't get me wrong I like them and they're good gatherers but they're always aggressive and they spawn alot in mobile one up=one pray to my best pterandon