There are two polarizing camps on the issue of our species origin (though there is varying degrees of compromise between the two stances as well as various alternative positions): the multiregional (or continuity) camp, and the Out of Africa (replacement) camp., there have been populations of humans living around the old world, and these all contributed to successive generations, eventually leading to modern humans.
was first reported in 1994; in 2009, scientists announced a partial skeleton, nicknamed ‘Ardi’.
The foot bones in this skeleton indicate a divergent large toe combined with a rigid foot – it's still unclear what this means concerning behavior.
Whereas in the previous species have been introduced with historical background and a discussion of the early, most important finds, and the individuals responsible for the species designation, this introduction will focus on some of the theory implicit in the discussion of the origin and spread of Most researchers currently accept the statement that “modern” humans can be considered to date to approximately 200–250 kyr.
Others (such as Milford Wolpoff), take the view that our species extends as far as approximately 2.0 myr, subsuming .
A good sample of canine teeth of this species indicates very little difference in size between males and females in this species.