First time I encountered one it threw one of my dinos into the ocean where it was eaten by a megalodon. I killed it out of fear that it would do the same to my other dinos. Eventually another one showed up and I tamed it, I named her Kevin after my one annoying friend that she reminds me of. No I do not care that she is a girl with a boys name.
It's pretty easy to see the player's skill, because they go to different sources for sauropod vertebrae. The only three that drop it is the diplo, the bronco, and the titanosaur. Pretty easy to see the differences in difficulty.