On the one hand, every single one of my ancestors going back billions of years has managed to figure [parenting] out. On the other hand, that's the mother of all sampling biases.
--xkcd on the terrifying implications of survivorship bias. In order to see the text, you need to have your pointer hover over the comic. Every xckd comic has this hidden comment text. Now go forth and waste an afternoon going through the entire xkcd archive and seeing all the gems you missed.