In Homo habilis it was quite limited: they would only have been able to make a few different sounds. In Homo erectus a much more elaborate range of sounds could be produced. Finally there is apex hunting. Humans are not natural hunters and for large prey needed weapons and team work. read more
A new paper published by Michael Hammer from the University of Arizona, however, provides new evidence that Homo sapiens not only interbred with Neanderthals in Eurasia, they also had sex with several species of our ancestors across the African continent. read more