Chimp girls play with "dolls"

[Pythagorean]

I'm at my iPhone now, so locating the actual sci article is annoyingly difficult, bit googling "chimps play with dolls" will give the pop sci articles.

Apparently, young female chimps play with sticks like dolls, whereas young male chips do not. Interesting implication in the whole nature/nurture entanglement.

[Borg]

Here's the Science Daily article
Young Female Chimpanzees Treat Sticks as Dolls: Growing Evidence of Biological Basis for Gender-Specific Play in Humans (http://www.sciencedaily.com/releases/2010/12/101220121109.htm)