If you knock out something that would have a ridiculous tame time without some prime and you don't have a quetz, a raptor trained with speed, damage, and HP can take down low level Brontos, stegos, and sarcos with relative ease. Their fast speed allows you to rush and and collect 1 or 2 prime and then quickly return to your tame. Having one person stay with the tame to watch the unconscious bar would be advised in this situation.
They carry stuff, most likely inventory from things it’s killed or that you’ve put in there. WARNING: you add extra weight so if you have at least half full in weight, put it somewhere else or your raptor will not be able to move when you ride it. Really efficient, kill a moshops in less than a min.