Whoever it was who said one pushed them off a cliff for no reason. That was a diplodocus not a bronto diplodocus are small and have straight necks and pointy teeth for stripping leaves off of bushes and ferns while brontos are big with bendy necks and kind of beak like mouths for snapping leaves and twigs put of the canopy.
I was taking 11 dilos, all between lvls 5-40 to try to explore the south cave in The Island. When I looked out from behind a rock, I saw a big blue egg sitting in an opening. I picked it up, and the nearby bronto did nothing. I got hungry, and bronto eggs restore 100 hunger, so I ate it. THEN the bronto got mad. It chased after me and my dilos attacked it. It killed 6 of the dilos before I finished it off with a regular bow. Got the trophy and named the five remaining dilos, including my strongest lvl 38, Bronto Killers 1-5