They are primarily used for gathering wood. Wood also ways less on him, just like the beaver on The Island map. The same goes for stone, although he cannot harvest it. Another use is its ranged torpidity attack. Not very good for knocking out dinosaurs, but in PvP it can easily knockout enemy players, since the shot is widespread. Its pretty much a torpor shotgun.
Gathers wood fast and carries it at 1/5 weight stone is 1/2. Weak on the sides so if you really like this dino to patrol keep another dino with it to aid. Excellent at killing mantis to gathering organic polymer and chitin.
I have 12 on platforms 4 pillars high scattered around my base. I have an issuse with dino spawns in the base. So they act as a long range needle launcher. Weigh down with sand because its weight isnt affected by the dragons buff. Set all to long range aggressive and u have a protected base. Add a few plant X for added assurance. I no longer have spawn problems. Found a ready to tame terror bird today too pretty neat.
No longer carries wood at 1/5 weight, now carries at 1/2 but can now be carried by argentavis and can farm wood similar to farming metal with an argentavis and anky, upgrade melee damage to get the most wood possible.