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ravens-can-spot-a-cheater-and-will-shun-one
Ravens can spot a cheater and will shun one another for being unfair.  The birds work together to get equal amounts of food – but if they notice another raven taking more than its fair share, they immediately lose trust and won’t cooperate with them in the future. (, )
the-happiest-couples-are-those-who-consider-each
The happiest couples are those who consider each other their best friend.  (, )