An easy way to tame the velonosaur is to make a boomerang and agro it. When it tries to shot you run up to it making sure your under flaps and spam throw the boomerang aiming to the ground so it will come back faster. If it switches to melee simply walk away till it switches back to turret mode. With that done you can continue boomerang spamming.
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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.