Now I don't buy it but Was the Golden Rule Born in the Mind of a Monkey? proposes the view that morality/ethics is biological/evolutionary. Do watch the video because it is hilarious!
Frans de Waal says that his research with primates shows that “instead of fairness and justice being intellectual products, something we have arrived at through reason, they are embedded in basic emotions, some of which are found in other primates,” possibly through a shared evolutionary history. “This is basically the [Occupy] Wall Street protest that you see here,” de Waal says at the end of the video clip. If his point about fairness is right, then arguments about inequality take on a biological imperative—greater equality can be seen as the “natural order” of things, and inequality as an inherently destructive force. As de Waal himself has argued in his The Age of Empathy, our capacity for building a stable society rests in part on knowing what kind of animals we humans are.
I don't buy it because I think it's a projection of human thinking onto animals much the same as you can read about some prehistoric tribal behavior and project communism or capitalism on it.