The Gap is a 2013 nonfiction book by Thomas Suddendorf that discusses what cognitive qualities separate humans from other animals, and how they evolved.
The Gap: The Science of What Separates Us From Other Animals. Basic Books: New York
Joseph Maldonado (2013). The Gap: The Science of What Separates Us from Other Animals. Psych Central. Retrieved on October 5, 2014, from http://psychcentral.com/lib/the-gap-the-science-of-what-separates-us-from-other-animals/00018372
Wray Herbert (10 February 2014). Social Animals - Pondering the limits of anthropomorphism. The Weekly Standard Vol. 19, No. 21. Retrieved on October 5, 2014, from http://www.weeklystandard.com/articles/social-animals_775990.html