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The ultimate colonists: human ancestors settled into one ecosystem after another.(Stone Age evolution)

The Stone Age was rough on community life, at least among animals trying to make a living in Africa. A range of species would move into a local habitat--gazelles, zebras, pigs, people, you name it--and take a few generations to establish the web of interactions that characterizes an ecosystem. After a millennium or so, dramatic climate shifts would then radically remodel the habitat, motivating the residents to leave. Eventually, a new collection of species would inhabit the area.

As these communities formed, dispersed, and reformed, one line of creatures always found a place in the mix--members of the Homo lineage, the ancestors of people today. Therein lies a couple of ...

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