Why did our ancestors start walking upright?tags: human evolution, CS Monitor, apes, bipedalism
Being four-legged has its perks. As a quadruped, your center of gravity is lower, there's less wind resistance when you're running, and, best of all, you can use your hind foot to scratch your ear.
All of this raises a big question: What were our apelike ancestors thinking when they started walking upright?
A prevailing hypothesis is that they were prompted by climate change. As African forests declined due to temperature fluctuations some 2.5 million years ago, the hypothesis goes, our australopithecine ancestors descended from the trees and ventured out into the open savanna, an environment thought to be friendlier for those standing on two feet....
comments powered by Disqus
- King Tutankhamun did not die in chariot crash, virtual autopsy reveals
- Easter Island’s ancient inhabitants weren’t so isolated after all
- Turin shroud was made for medieval Easter ritual, historian says
- Japanese Village Grappling With Wartime Sins Comes Under Attack
- Gestapo Imposter Tricked Nazi Sympathizers in WWII
- Turning West, Historians Take a Wider View of Early America
- History to Launch Online Course for College Credit
- 33.3 million viewers tuned in for 'The Roosevelts' documentary series
- Eric Foner debunks Underground Railroad myth
- Juan Cole claims the Arab Spring is still promising. Doubters say he’s naive.