Meaning "truly social," eusociality is characterized by a reproductive division of labor, overlapping generations, and having a class of workers (usually sisters of the offspring) cooperate in care of the young . Only one or a few females (the "queens") actually reproduce with only a few of the males. There are "sterile castes" of males and females that do not reproduce, but perform the necessary tasks of the colony, including helping to raise the offspring of those that do reproduce.
if they were only sterile!