Hominids developed as a marsh-living variation of the genus Pan in the inland deltas of the Great Rift Valley. Hominid diet consisted largely of fish proteins, fueling the physical development of the brain. http://www.medicalnewstoday.com/articles/38009.php At some point early on, hominids adapted to increasing wetland conditions. It was as a wetland predator that hominids began to walk upright, lost their hair, and developed floating breasts. http://www.riverapes.com/AHAH/ComparativeBiology/Bipedalism/Bipedalism.htm Birth took place in the water http://answers.yahoo.com/question/index?qid=20071029113809AAFrtYa; babies can be taught to swim at a similar rate to learning to walk. http://www.babyswimming.com/whatlearn.htm
Those big brains switched the evolutionary process to the fast track. Instincts were suppressed to make room for a growing common mental space, which soon overtook the natural environment as the prime motivator of hominid behavior. Brains grew so big they began to finish development outside the womb. It was this interface between biology and early childhood experiences that created the opportunity for the explosive growth and increasing complexity of human culture. http://books.google.com/books?id=9CM5L4WPXp8C&printsec=frontcover&dq=Lifespand+development+and+the+brain&ei=_q0QSN-aKpyStwOq9cyYBg&client=firefox-a&sig=Ped5lshb0Mo9d-_kq984JjgiMlc#PRA1-PA15,M1
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