https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2583786/#:~:text=Male%20monkeys%2C%20like%20boys%2C%20showed,showed%20greater%20variability%20in%20preferences.&text=Thus%20sex%20differences%20in%20toy,in%20boys%20than%20in%20girls.
>monkeys prefer gendered toys that mimic humans preferences
>monkeys prefer gendered toys that mimic humans preferences
