I call the notion that we are nothing but killer apes the Beethoven fallacy. Beethoven was disorganized and messy, and yet his music is the epitome of order.
Frans de WaalI have often noticed how primate groups in their entirety enter a similar mood. All of a sudden, all of them are playful, hopping around. Or all of them are grumpy. Or all of them are sleepy and settle down. In such cases, the mood contagion serves the function of synchronizing activities.
Frans de Waal