Homo erectus were ancient human relatives who lived in Africa and Eurasia from about 2 million years ago. They were skilled big game hunters and capable of taking down large game for their sustenance. This suggests that they are adept at communal hunting, teaming up to take down prey or frighten carnivores away. Yet, Being social is a good predictor of having a large brain and intelligence, which isn't exactly breaking news about humans.

Homo erectus, like Neanderthals, were massively pumped up on male hormones, exhibiting a pathological hormonal condition, unlike anything seen in humans today. Simply put, the Neanderthal body was bursting at the seams with natural steroids. The ancient blood that once surged through this long-extinct group of archaic humans had more in common with modern humans than scientists believed, according to an analysis of genomes.