Brain Size and Hunting Ability

A recent anthropology article "Brain Size and Hunting Ability in Earliest Man" by Grover S. Krantz makes the case of the direct link between significant physical changes and greatly increased hunting ability. Krantz points out the differences between Australopithecus Africanus, a baboon-like creature with a 500cc brain and Homo Erectus, an upright bi-pedal creature with a 1000cc brain.

The early Australopithecus Africanus was mostly a gatherer, eating primarily vegetables with small hands and a small brain. The later Homo Erectus was marked by a change in the pelvis making him faster and upright. Additionally the longer thumbs helped with the use of crude tools.

The next time your hunting buddies ask you how you made that great shot playing Big Buck Hunter, just simply reply that it's either your upright pelvis, your longer thumb, or your increased brain capacity(as denoted by your fantastically high forhead). And if they spent less time hunched over their barstool gathering peanuts with their small thumbs, they might understand.