About 18 million years ago, geologic forces in Africa up thrust a north-south
mountain barrier that separated "Proconsul africanus" into two groups.
Those to the west evolved into apes and those to the east into hominids
that had access to the seashore and sea foods rich in amino acids
essential to brain development. Primitive tool use coincided that
increased procurement levels of these and other protein rich foods.
Hominids are our human ancestors.'
