If you want to tame brontosaurus then don't see the level They will kill therizino, spino, rex and many just get lystrosaurus atleast 2 they will make bronto level up fast get a petreadon fly up a cliff if there is no cliff is nearby just hit it and fly in your petreadon fly where cliff is get tranq arrows head shot it it will easily run away keep hitting until it fall feed it narco berries bam you have tamed bronto they get many narco berries making easy to tame any herbivores