jan 1, 4400000 BC - Ardipithecus ramidus. Aramis, Ethiopia.

Description:

Ardipithecus ramidus 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 bipedal behavior.
Read more:
http://humanorigins.si.edu/evidence/human-fossils/species/ardipithecus-ramidus

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