I tamed a bronto when I was level 10. My tribe mate and me had only slingshots, and we ran it up to the cliff near the swamp. I got stuck there and couldn’t attack us, so we literally just shot it. In the end it ran into the forest and got stuck on the trees, which made it easier to knock out. In the end, I was the only one shooting it. And after that (this is quite off topic,) I tame a diplo because I could, apparently.