yes, they are. their evolution for the most part seems to make sense. most likely, the predetors on their planet are relatively small, so there was a drive for them to be larger, and a large body needs to be sustained, hence the hunger, especially if food on the planet is hard to find. eventually, selection would have favored those intelligent enough to find new sources of food. id say of all species (other than the engineered hork bajir) their evolution makes the most sense, even moreso than humans.