It's best to leave them alone unless you want to tame them. They act like spike walls, so you and your dino take damage when you melee it, and it's a lot of damage, even low level ones do a lot. If you want to kill one, it's best to use ranged attacks like a gun or a wyvern blast.
These thing are basically living spike walls, they impaled my dodo, so I got out my lvl.378 Rex, Fully imprinted, 60k+ health, 4000 melee, 215+speed. And killed it, for now on when I’m on my Rex, I’m going to slaughter every kentro I see, with my Rex I’m finna slaughter it. #Remembering josh the dodo..
I learned that these guys have damage reflection the hard way! I went to Spain attack it with my level 208 2500 health Petra and it just stole its soul from its body. It wasn't even high level only a level 20!