The following article is a guest post from our contributor, Anita Sattler, an Associate Professor in the Department of Psychology and Neuroscience at the University of Virginia.
We’d like to thank Anita for her time and for providing the above-mentioned illustrations.
Anita’s previous work includes an article on why humans are “animals”, an article about the evolutionary origins of language and an article analyzing the evolutionary roots of gender identity.
You can follow her on Twitter at @anitamsattler and on Facebook.
This post originally appeared on the University at Buffalo’s blog Animal Psychology.