L. W. Ratnieks ( 2008 - 05-30 ). " Ancestral Monogamy Shows Kin Selection Is Key to the Evolution of Eusociality " ( html ). Science ( American Association for the Advancement of Science ) 320 (5880): 1213–1216. doi : 10.1126/science.1156108 . http://www.sciencemag.org/cgi/content/abstract/320/5880/1213 . Retrieved 2008-08-04 .   ^ Effect of