imagine you're documenting social behavior among two different bands of orangutans separated by a wide river. orangutans hate to swim, so it's safe to say that these 2 populations never see each other and never interact. one day you notice that the group on the left bank of the river shapes sticks to pick honey and insects out of trees. they take a different kind of stick and fashion it in a different way to pull seeds out of a delicious fruit. despite months of observation, you never see any orangutans on the right bank do this. what is your best conclusion from this?
