Have the Borg ever assimilated a non-sapient species? Perhaps the equivalent of a large land mammal or a rodent or something of that sort? Answer No, I can`t recall a time when they would ever assimilate anything like that, because the Borg discriminate in the sense that they will assimilate a species only if they can provide a technological or biological use to the Borg. A good example of this would be the Kazon from Star Trek: Voyager who, even though they were more advanced than any run of the mill species, were deemed unworthy of assimilation.