Ape to Man - Excerpt summation from "African Genesis" by Robert Ardrey -

The Predatory Transition from Ape to Man was a paper
that no regular scientific journal would touch, and so it
appeared in The International Anthropological and Linguistic
Review, published in Miami. The stricken editor of this
remarkable journal tacked a foreword to Dart’s work
disclaiming responsibility for the author’s deductions, and
even for the australopithecines themselves. The foreword
ended with a pitiful sigh: “Of course, they were only the
ancestors of the modern Bushman and Negro, and of nobody
else. ” (Editor’s italics.)
What Dart put forward in his piece was the simple thesis
that Man had emerged from the anthropoid background for
one reason only: because he was a killer. Long ago, perhaps
many millions of years ago, a line of killer apes branched off
from the non-aggressive primate background. For reasons of
environmental necessity, the line adopted the predatory way.
For reasons of predatory necessity the line advanced. We
learned to stand erect in the first place as a necessity of the
hunting life. We learned to run in our pursuit of game across
the yellowing African savannah. Our hands freed for the
mauling and the hauling, we had no further use for a snout;
and so it retreated. And lacking fighting teeth or claws, we
took recourse by necessity to the weapon.
A rock, a stick, a heavy bone — to our ancestral killer ape
it meant the margin of survival. But the use of the weapon
meant new and multiplying demands on the nervous system
for the co-ordination of muscle and touch and sight. And so at
last came the enlarged brain; so at last came man.

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