If you are a new player, try not to provoke them. I have ended up hitting trikes when using a hatchet or pickaxe on resources and ended up dead because of it. If you attack it, it will constantly try to make sure its head is facing you, preventing you from doing significant damage. It's best to use a bulky mount or tranq arrows to kill it, but if you are looking for keratin, try carbonemys instead. They are far easier to kill.