David Carrier, University of Utah (image) University of Utah Caption University of Utah biology Professor David Carrier's new study concludes that human ancestors known as australopiths retained short legs during their 2-million-year history because a short, squat stature helped spell victory in male-male fights over females. Credit Nadja Schilling, University of Utah. Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.