An ankylo (leveled in melee) and a quetz or argy (leveled in weight) is the single best way to farm metal. Just pick the anky with your bird and drop it on metal rocks. Then get on the anky and hit the metal rocks. The ankylo’s weight does not matter since the bird carries all
So a lvl 30 anky can fight and alpha raptor! Mine has killed 3 due to it hitting hard and knocking them back, the raptors can't hit them! Ankylosaurs aren't just for metal, but they are also for alpha raptor killing machines! These things are my favorite herbivore because of this.