A new study suggests chimpanzees may show some of the same sensibility about fairness that humans do.
Mammals such as wolves, orcas and elephants need their groups to survive, and empathy and cooperation are survival mechanisms. De Waal discusses these mechanisms in his 2009 book "The Age of Empathy: Nature's Lessons for a Kinder Society."
"We think that empathy evolved to take care of others that you need to take care of, especially, of course, between mother and offspring, which is universal in all the mammals," de Waal said.
By Elizabeth Landau, CNN
More at Culture of Empathy Builder Page: Frans de Waal