An interesting tidbit about our more recent past.

Love Liza
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[log in to unmask] (Liza May)

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Fossilized pelvises of humans and our hominid relatives can help
teach scientists how our brain evolved and how we learned to walk on
two legs, but they're extremely rare. Scientists found a
200,000-year-old
fossilized pelvis from Spain. The bone belonged to a hominid that had
wide hips and could give birth to babies with large heads. Thus, these
early humans, like lower primates, gave birth to babies with a more
fully
developed brain. This means that a peculiar human trait - a brain that
is
born immature and develops after birth - evolved later.

Arsuaga, J.-L., Lorenzo, C., Carretero, J.M. et al. 1999. A complete
human pelvis from the middle Pleistocene of Spain. Nature
399(6733):255-258.