Register for an account


Enter your name and email address below.

Your email address is used to log in and will not be shared or sold. Read our privacy policy.


Website access code

Enter your access code into the form field below.

If you are a Zinio, Nook, Kindle, Apple, or Google Play subscriber, you can enter your website access code to gain subscriber access. Your website access code is located in the upper right corner of the Table of Contents page of your digital edition.

Planet Earth

Was Lucy a Brutal Brawler?

These legs were made for fighting.

By Boonsri DickinsonJune 26, 2007 5:00 AM
Australopithecus | Image courtesy of Alfred BrehmTierleben, Small Edition, 1927


Sign up for our email newsletter for the latest science news

Anthropologists have long assumed that the short stature of australopithecines like Lucy was related to treetop living: Having short legs makes it easier to climb trees and gives stability when balancing on branches. David Carrier, a biologist at the University of Utah, has another idea. After taking measurements and collecting observations on nine living primate species, including humans, Carrier concluded that the living apes with the shortest legs for their body size, like gorillas and orangutans, are those that spend the least time in trees. They’re also the ones whose males exhibit especially aggressive behavior.

Carrier doesn’t rule out that Australopithecus may have spent time in trees, but he insists a more likely explanation for why short legs persisted is that Lucy and her ilk were particularly prone to fighting. According to this hypothesis, it was advantageous for males to remain short because it gave them an edge when grappling with one another for access to females. “With short legs, you have a lower center of gravity. You’re more stable, and you have greater leverage,” Carrier says.

3 Free Articles Left

Want it all? Get unlimited access when you subscribe.


Already a subscriber? Register or Log In

Want unlimited access?

Subscribe today and save 50%


Already a subscriber? Register or Log In