Biologists have observed a chimp using a tool to clean the teeth of a deceased group member in an unusually intimate manner (video below). This not only gives academics more information about apes' emotional intelligence, but it may also shed light on the evolutionary origins of humans' death rituals. Scientists from Scotland's University of St Andrews saw the behavior for … [Read more...] about Never-Seen-Before Behavior Of Chimp Brushing Dead Son’s Teeth