Build a wide wooden wall at least 3 storeys high and make a small door. Aggro the bronto and go through the door... It cannot climb something bigger then 3 walls on top of each other..... After trapping... Wish it Merry Christmas with tranqs.
These are the easiest tame ever, just get far away, shoot it with a crossbow repeatedly, when it gets close run and shoot, then boom u knocked out a brontosaurus (I literally have 5 of them that’s how easy they are to tame) please