On the other hand, morality is as old as the hills. But only once we started talking to each other could we build up miniature libraries in our heads, memorizing instructions from leaders, overseeing the work of others, teaching offspring, negotiating business deals, etc., etc. Morality and ethics must have developed alongside of our linguistic development. Of course, the neurology involved is another question.
Maybe its a matter of degree. There are a number of interesting articles; I forced myself to keep the number to a mininum… :
Here are a couple of examples of primates showing a sense of fairness:
“Personality influences the brain’s responses to emotional situations more than thought, according to new research”
“Case psychologist Exline studies relationship of narcissistic personality, forgiveness”
“Nonhuman Animals and the Moral Sense”