Photo: Upright Walking Started in Trees, Ape Study Suggests



Ancient apes that traveled the treetops on two legs—such as modern-day orangutans do—may have led to upright walking in humans, experts claim.

Yet a prevailing theory still maintains bipedalism evolved after our ancestors left the trees and began living in the African grasslands.

Photograph courtesy SKS Thorpe


NEWS FEEDS    After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed. After installing a news reader, click on this icon to download National Geographic News's XML/RSS feed.

Get our news delivered directly to your desktop—free.
How to Use XML or RSS

ADVERTISEMENT

NATIONAL GEOGRAPHIC'S PHOTO OF THE DAY

50 Drives of a Lifetime

National Geographic Traveler has scoured the globe for the world's most beautiful, interesting, and off-beat road trips. Dive in to get drive directions, quizzes, photos, and more.