Geneticists have discovered people share 98% to 99% of their genes with the chimps. It's not surprising, that the animals have similar behavior like the humans. The chimps have similar life style like many ancient people communities had, as hunters and collectors. They use tools and make wars against neighboring groups, systematically murdering individuals and even whole communities. A captive group was witnessed performing a "rain dances": shuffling around in a circle stamping out a rhythm.
