In ark mobile Dodecirus can be found in large numbers at the redwood forests at the top left of the map or the mountains.
Dodecirus are knockout tames and they eat berries
They have armour on the top where they take less torpor so shoot their underside and if you damage it to much it will curl into a ball and it will be hard to knock them out and if you hit a Dodecirus all nearby Dodecirus will attack you
Dodecirus are slow so you dont need a mount to outrun them and you wont need a trap because it might not catch up to you.
Abilities when tamed:
Dodecirus will turn into a ball and roll really fast also they can destroy rocks,bushes and trees and gather their resources and they have a weight reduction on stone abd the saddle is unlocked at level 34 and made in the smithy.
Instead of shooting in the face with tranq arrows, go for the tail. Will take practice or if you managed to lure into a trap of yours it will swing its tail. If on foot just walk backwards and close enough to trigger a swing at you to get shots to the tail. In a trap just time it when it swings. Avoids it from taking too much damage from heatshots and balling up.