I’ve imagined that the burrabb were a more generally carnivorous species that humans but I’d have to do some research before I committed to the idea. The more specialized the diet the less adaptable the species. Human civilization grew out of agriculture. The burrabb might have developed agriculture in order to feed their food animals rather than as a way to feed themselves. With the farm comes the town. With the town comes space travel. I’m probably hopping over a couple of steps here but you get the idea. A space faring culture is less likely to arise from a nomadic herding culture than an agrarian/industrial one.