6) REDUCTION OF DURATION? Why are the durations of species of hominids decreasing over time? The more modern the hominid, the shorter its existence. For example, according to wikipedia, Homo erectus lived from 1,900,000 BC to 70,000 BC. By comparison, the more recent neaderthals lived from 130,000 BC to 40,000 BC. Why is the existence of the neanderthal so much shorter?