First, what it really measures is not the rate of monogamy (as in being with one partner at a time), but the rate at which animals only mate with one other animal throughout life, without contraception (which humans have).
Second, I wonder how culture shapes the score for humans. A lot of monogamous behavior in humans is shaped not by natural drive to stick to one partner, but by culturally defined repercussions for going out with someone else.


Stop sheep-shaming