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The ancestors of humans were walking upright more than 3m years ago, according to an analysis of a fossilised foot bone found in Ethiopia.
About 50 years ago the ranch owner Marge Baisch, Shana's mother-in-law, stumbled upon what paleontologists determined was the foot bone of an Edmontosaurus.
Now, a fossilized foot bone from Hadar, Ethiopia, reveals that A. afarensis had arched feet, as do modern humans, and was fully committed to walking upright.
The eight talons and a foot bone were once attached to one another by a string or thread, the scientists believe.
But because of a lack of foot bone specimens, scientists have long debated how well she walked — that is, whether A. afarensis also used a grasping movement with the feet, as apes do when they grab tree branches.
The dating of the underground layer were the eight talons and foot bone were found shows that they are 150,000 years old, a time when the Neanderthals were the only human species inhabiting Europe.
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Clarke had been secretly working on a new find: Australopithecus foot bones from Sterkfontein.
Ornithomimus's legs were very long, especially its foot bones (metatarsals).
Finding any hominin foot bones that old is rare, Dr. Haile-Selassie said.
Most were ostrich-sized and were adapted for fast running, with particularly long foot bones, or metatarsals.
Nothing quite like it has ever been assembled before, the foot bones connected to the ankle bones and everything else up to the cranium.
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