These things are freakin cowards. They will run at the first sign of danger. Make sure to carry with argy while using for maximum efficiency. If you trained it for gathering prime, put it in a tame order group of your choice, and whistle attack target on the dead creature while carrying it with argy/quetz, preferably a quetz because you can carry and attack at the same time, and fly close. Then once it harvests, fly home and enjoy the prime!
If you're in the need of Narcotics and can get enough Narcoberries for them in a short amount of time, Moschops can fix that problem easily, either manually attack harvestable plants and you'll get resource multipliers while doing it with a moschops or set it on aggressive (If you set it to aggressive it won't attack but will endlessly harvest corpses and plants until it's carrying too much to move.) A great starter farmer dinosaur if you're in the need for one.