The switch to walking on two legs, instead of four, is a major moment in the evolution of our species, which is why scientists are keen to pinpoint exactly when it happened – and a new study puts the adaptation as happening around 7 million years ago.
, the oldest representative species of humanity. These fossils were first discovered in Toros-Menalla in Chad in 2001.
At the same time, it's probably likely these early hominins did a fair bit of tree climbing using all four limbs as well – as you would expect if the species made the gradual shift from four legs to two legs., with new insights into bipedalism at the early stage of hominin evolutionary history," write the researchers in their
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