Find a mountain or hill that’s near the velonasaur but far enough so when you try to knock it it’ll stay in that position and try to shoot at you and build a building around you with an opening on the side with the volonosaur then fire at it with your tranqs. I used this method and it worked
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You don’t need to trap this to tame, it’s a solo tame. If you run up to it, it will go into turret mode then you need to walk circles around it and keep hitting with tranq until it eventually tries to walk away *in turret mode so really slow walking*
Make a 2x2 cage with ramps and a door. Lure the velonasaur in with a flyer. If you stay close to him he won’t enter turret mode. Leveling melee raises his projectile hit points. Also level stamina to attack longer. A high level can shred everything I’ve come across. Can’t wait for an imprinted one for the speed bonus.