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> As a species, humans agree to basic rules of conduct that form an implied Social Contract. Can any non-human species do that?

A great question, and the answer is yes. Here's a clear example:

http://www.youtube.com/watch?v=aAFQ5kUHPkY Monkeys cooperate to solve a problem, and one of them clearly shows a sense of social contract when he gives a reward to his partner, even though he could easily keep it for himself.

Studies have shown that animals definitely have an innate sense of fair play: http://twentytwowords.com/2012/10/08/monkey-hilariously-reac...

The above study has been replicated on a variety of animals.

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