Short-tempered. Better to have someone like Reaper when killing these, as Reaper takes little damage from attacks due to it not being exposed to light. Being around these too long will agro them, try not to stay round Kentro for too long when of weak land dino.
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.