Great post and this reminds me of the documentary "Becoming Human" because I was fascinated by that series.
I didn't know that we humans shared the world with and had ancestors from so many different kinds of humans or near humans such as the australopithicene (bi pedal apes) and homo (human) lineages.
Great post and find =)
I actually never thought about that either, but it makes sense if you think about it.
Makes you really wonder how far back this goes. Or how far it will go in the millennia to come.