" since infant care is quite labor-intensive, biological mothers also try to enlist other subordinate females in caring for their infants by destroying the subordinate’s capacity to mate or to bear infants of her own. Thus, some female primates will sometimes fight for each other, but, more often, females fight against each other: mother against daughter, higher-ranking female against lower-ranking female, one troop of females against another troop of females. They fight over food, infants, sex, and position in the hierarchy. "

― Phyllis Chesler , Woman's Inhumanity to Woman