Meanwhile in our primate cousins.
http://onlinelibrary.wiley.com/doi/10.1 ... 23862/full
In a well-known study of captive vervet monkeys, Alexander and Hines (2002) found toy preferences among male and female vervets that paralleled human child toy preferences; males preferred toy cars and balls, whereas females preferred a doll and a pot. In a followup study of captive rhesus monkeys, Hassett et al. (2008) replicated the male preference for wheeled toys, but female preferences were more variable. […] There is emerging evidence of such differences in the wild. Immature chimpanzee males were found to engage in more object-oriented play than females (Koops et al., 2015), but female youngsters at one study site perform a specific behavior called “stick carrying,” in which a stick is cradled and carried in a form of play mothering, significantly more often than young males (Kahlenberg and Wrangham, 2010). Female biases in other forms of play parenting, such as interest in or attempting to interact with and carry other infants, are also widespread (e.g., western lowland gorillas, Meder, 1990; rhesus macaques: Lovejoy and Wallen, 1988; bonnet macaques: Silk, 1999; blue monkeys: Cords et al., 2010). Thus, there are diverse lines of evidence for sex differences in play behavior in many primate species. Indeed, these sex differences in play may represent evolved predispositions that reflect patterns of mating competition and parental investment that are shared by most mammalian species.
So is this a cultural problem? Are corporations accidentally changing monkey culture by marketing the wrong toys to female monkeys? Which is why, when they grow up, all the male monkeys become more interested in science and get all those lucrative STEM jobs in the jungle.
_________________
Behold! we are not bound for ever to the circles of the world, and beyond them is more than memory, Farewell!